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1 | /* Copyright 2011-2013 Autronica Fire and Security AS |
2 | * |
3 | * This program is free software; you can redistribute it and/or modify it |
4 | * under the terms of the GNU General Public License as published by the Free |
5 | * Software Foundation; either version 2 of the License, or (at your option) |
6 | * any later version. |
7 | * |
8 | * Author(s): |
9 | * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com |
10 | */ |
11 | |
12 | #ifndef _HSR_PRIVATE_H |
13 | #define _HSR_PRIVATE_H |
14 | |
15 | #include <linux/netdevice.h> |
16 | #include <linux/list.h> |
17 | |
18 | |
19 | /* Time constants as specified in the HSR specification (IEC-62439-3 2010) |
20 | * Table 8. |
21 | * All values in milliseconds. |
22 | */ |
23 | #define HSR_LIFE_CHECK_INTERVAL 2000 /* ms */ |
24 | #define HSR_NODE_FORGET_TIME 60000 /* ms */ |
25 | #define HSR_ANNOUNCE_INTERVAL 100 /* ms */ |
26 | |
27 | |
28 | /* By how much may slave1 and slave2 timestamps of latest received frame from |
29 | * each node differ before we notify of communication problem? |
30 | */ |
31 | #define MAX_SLAVE_DIFF 3000 /* ms */ |
32 | |
33 | |
34 | /* How often shall we check for broken ring and remove node entries older than |
35 | * HSR_NODE_FORGET_TIME? |
36 | */ |
37 | #define PRUNE_PERIOD 3000 /* ms */ |
38 | |
39 | |
40 | #define HSR_TLV_ANNOUNCE 22 |
41 | #define HSR_TLV_LIFE_CHECK 23 |
42 | |
43 | |
44 | /* HSR Tag. |
45 | * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB, |
46 | * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest, |
47 | * h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr, |
48 | * encapsulated protocol } instead. |
49 | */ |
50 | #define HSR_TAGLEN 6 |
51 | |
52 | /* Field names below as defined in the IEC:2010 standard for HSR. */ |
53 | struct hsr_tag { |
54 | __be16 path_and_LSDU_size; |
55 | __be16 sequence_nr; |
56 | __be16 encap_proto; |
57 | } __packed; |
58 | |
59 | |
60 | /* The helper functions below assumes that 'path' occupies the 4 most |
61 | * significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or |
62 | * equivalently, the 4 most significant bits of HSR tag byte 14). |
63 | * |
64 | * This is unclear in the IEC specification; its definition of MAC addresses |
65 | * indicates the spec is written with the least significant bit first (to the |
66 | * left). This, however, would mean that the LSDU field would be split in two |
67 | * with the path field in-between, which seems strange. I'm guessing the MAC |
68 | * address definition is in error. |
69 | */ |
70 | static inline u16 get_hsr_tag_path(struct hsr_tag *ht) |
71 | { |
72 | return ntohs(ht->path_and_LSDU_size) >> 12; |
73 | } |
74 | |
75 | static inline u16 get_hsr_tag_LSDU_size(struct hsr_tag *ht) |
76 | { |
77 | return ntohs(ht->path_and_LSDU_size) & 0x0FFF; |
78 | } |
79 | |
80 | static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path) |
81 | { |
82 | ht->path_and_LSDU_size = htons( |
83 | (ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12)); |
84 | } |
85 | |
86 | static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size) |
87 | { |
88 | ht->path_and_LSDU_size = htons( |
89 | (ntohs(ht->path_and_LSDU_size) & 0xF000) | |
90 | (LSDU_size & 0x0FFF)); |
91 | } |
92 | |
93 | struct hsr_ethhdr { |
94 | struct ethhdr ethhdr; |
95 | struct hsr_tag hsr_tag; |
96 | } __packed; |
97 | |
98 | |
99 | /* HSR Supervision Frame data types. |
100 | * Field names as defined in the IEC:2010 standard for HSR. |
101 | */ |
102 | struct hsr_sup_tag { |
103 | __be16 path_and_HSR_Ver; |
104 | __be16 sequence_nr; |
105 | __u8 HSR_TLV_Type; |
106 | __u8 HSR_TLV_Length; |
107 | } __packed; |
108 | |
109 | struct hsr_sup_payload { |
110 | unsigned char MacAddressA[ETH_ALEN]; |
111 | } __packed; |
112 | |
113 | static inline u16 get_hsr_stag_path(struct hsr_sup_tag *hst) |
114 | { |
115 | return get_hsr_tag_path((struct hsr_tag *) hst); |
116 | } |
117 | |
118 | static inline u16 get_hsr_stag_HSR_ver(struct hsr_sup_tag *hst) |
119 | { |
120 | return get_hsr_tag_LSDU_size((struct hsr_tag *) hst); |
121 | } |
122 | |
123 | static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path) |
124 | { |
125 | set_hsr_tag_path((struct hsr_tag *) hst, path); |
126 | } |
127 | |
128 | static inline void set_hsr_stag_HSR_Ver(struct hsr_sup_tag *hst, u16 HSR_Ver) |
129 | { |
130 | set_hsr_tag_LSDU_size((struct hsr_tag *) hst, HSR_Ver); |
131 | } |
132 | |
133 | struct hsr_ethhdr_sp { |
134 | struct ethhdr ethhdr; |
135 | struct hsr_sup_tag hsr_sup; |
136 | } __packed; |
137 | |
138 | |
139 | enum hsr_dev_idx { |
140 | HSR_DEV_NONE = -1, |
141 | HSR_DEV_SLAVE_A = 0, |
142 | HSR_DEV_SLAVE_B, |
143 | HSR_DEV_MASTER, |
144 | }; |
145 | #define HSR_MAX_SLAVE (HSR_DEV_SLAVE_B + 1) |
146 | #define HSR_MAX_DEV (HSR_DEV_MASTER + 1) |
147 | |
148 | struct hsr_priv { |
149 | struct list_head hsr_list; /* List of hsr devices */ |
150 | struct rcu_head rcu_head; |
151 | struct net_device *dev; |
152 | struct net_device *slave[HSR_MAX_SLAVE]; |
153 | struct list_head node_db; /* Other HSR nodes */ |
154 | struct list_head self_node_db; /* MACs of slaves */ |
155 | struct timer_list announce_timer; /* Supervision frame dispatch */ |
156 | int announce_count; |
157 | u16 sequence_nr; |
158 | spinlock_t seqnr_lock; /* locking for sequence_nr */ |
159 | unsigned char sup_multicast_addr[ETH_ALEN]; |
160 | }; |
161 | |
162 | void register_hsr_master(struct hsr_priv *hsr_priv); |
163 | void unregister_hsr_master(struct hsr_priv *hsr_priv); |
164 | bool is_hsr_slave(struct net_device *dev); |
165 | |
166 | #endif /* _HSR_PRIVATE_H */ |
167 |
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