tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* Copyright 2011-2014 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 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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#define HSR_SEQNR_START (USHRT_MAX - 1024)
33#define HSR_SUP_SEQNR_START (HSR_SEQNR_START / 2)
34
35
36/* How often shall we check for broken ring and remove node entries older than
37 * HSR_NODE_FORGET_TIME?
38 */
39#define PRUNE_PERIOD 3000 /* ms */
40
41
42#define HSR_TLV_ANNOUNCE 22
43#define HSR_TLV_LIFE_CHECK 23
44
45
46/* HSR Tag.
47 * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
48 * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
49 * h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
50 * encapsulated protocol } instead.
51 *
52 * Field names as defined in the IEC:2010 standard for HSR.
53 */
54struct hsr_tag {
55 __be16 path_and_LSDU_size;
56 __be16 sequence_nr;
57 __be16 encap_proto;
58} __packed;
59
60#define HSR_HLEN 6
61
62#define HSR_V1_SUP_LSDUSIZE 52
63
64/* The helper functions below assumes that 'path' occupies the 4 most
65 * significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
66 * equivalently, the 4 most significant bits of HSR tag byte 14).
67 *
68 * This is unclear in the IEC specification; its definition of MAC addresses
69 * indicates the spec is written with the least significant bit first (to the
70 * left). This, however, would mean that the LSDU field would be split in two
71 * with the path field in-between, which seems strange. I'm guessing the MAC
72 * address definition is in error.
73 */
74static inline u16 get_hsr_tag_path(struct hsr_tag *ht)
75{
76 return ntohs(ht->path_and_LSDU_size) >> 12;
77}
78
79static inline u16 get_hsr_tag_LSDU_size(struct hsr_tag *ht)
80{
81 return ntohs(ht->path_and_LSDU_size) & 0x0FFF;
82}
83
84static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
85{
86 ht->path_and_LSDU_size = htons(
87 (ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
88}
89
90static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
91{
92 ht->path_and_LSDU_size = htons(
93 (ntohs(ht->path_and_LSDU_size) & 0xF000) |
94 (LSDU_size & 0x0FFF));
95}
96
97struct hsr_ethhdr {
98 struct ethhdr ethhdr;
99 struct hsr_tag hsr_tag;
100} __packed;
101
102
103/* HSR Supervision Frame data types.
104 * Field names as defined in the IEC:2010 standard for HSR.
105 */
106struct hsr_sup_tag {
107 __be16 path_and_HSR_Ver;
108 __be16 sequence_nr;
109 __u8 HSR_TLV_Type;
110 __u8 HSR_TLV_Length;
111} __packed;
112
113struct hsr_sup_payload {
114 unsigned char MacAddressA[ETH_ALEN];
115} __packed;
116
117static inline u16 get_hsr_stag_path(struct hsr_sup_tag *hst)
118{
119 return get_hsr_tag_path((struct hsr_tag *) hst);
120}
121
122static inline u16 get_hsr_stag_HSR_ver(struct hsr_sup_tag *hst)
123{
124 return get_hsr_tag_LSDU_size((struct hsr_tag *) hst);
125}
126
127static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
128{
129 set_hsr_tag_path((struct hsr_tag *) hst, path);
130}
131
132static inline void set_hsr_stag_HSR_Ver(struct hsr_sup_tag *hst, u16 HSR_Ver)
133{
134 set_hsr_tag_LSDU_size((struct hsr_tag *) hst, HSR_Ver);
135}
136
137struct hsrv0_ethhdr_sp {
138 struct ethhdr ethhdr;
139 struct hsr_sup_tag hsr_sup;
140} __packed;
141
142struct hsrv1_ethhdr_sp {
143 struct ethhdr ethhdr;
144 struct hsr_tag hsr;
145 struct hsr_sup_tag hsr_sup;
146} __packed;
147
148
149enum hsr_port_type {
150 HSR_PT_NONE = 0, /* Must be 0, used by framereg */
151 HSR_PT_SLAVE_A,
152 HSR_PT_SLAVE_B,
153 HSR_PT_INTERLINK,
154 HSR_PT_MASTER,
155 HSR_PT_PORTS, /* This must be the last item in the enum */
156};
157
158struct hsr_port {
159 struct list_head port_list;
160 struct net_device *dev;
161 struct hsr_priv *hsr;
162 enum hsr_port_type type;
163};
164
165struct hsr_priv {
166 struct rcu_head rcu_head;
167 struct list_head ports;
168 struct list_head node_db; /* Known HSR nodes */
169 struct list_head self_node_db; /* MACs of slaves */
170 struct timer_list announce_timer; /* Supervision frame dispatch */
171 struct timer_list prune_timer;
172 int announce_count;
173 u16 sequence_nr;
174 u16 sup_sequence_nr; /* For HSRv1 separate seq_nr for supervision */
175 u8 protVersion; /* Indicate if HSRv0 or HSRv1. */
176 spinlock_t seqnr_lock; /* locking for sequence_nr */
177 unsigned char sup_multicast_addr[ETH_ALEN];
178};
179
180#define hsr_for_each_port(hsr, port) \
181 list_for_each_entry_rcu((port), &(hsr)->ports, port_list)
182
183struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt);
184
185/* Caller must ensure skb is a valid HSR frame */
186static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
187{
188 struct hsr_ethhdr *hsr_ethhdr;
189
190 hsr_ethhdr = (struct hsr_ethhdr *) skb_mac_header(skb);
191 return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
192}
193
194#endif /* __HSR_PRIVATE_H */