aboutsummaryrefslogtreecommitdiffstats
path: root/net/hsr/hsr_main.h
blob: 6cd4dff58727aea9ab1d52fd9d213e47fe1b2e1c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * Author(s):
 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
 */

#ifndef __HSR_PRIVATE_H
#define __HSR_PRIVATE_H

#include <linux/netdevice.h>
#include <linux/list.h>

/* Time constants as specified in the HSR specification (IEC-62439-3 2010)
 * Table 8.
 * All values in milliseconds.
 */
#define HSR_LIFE_CHECK_INTERVAL		 2000 /* ms */
#define HSR_NODE_FORGET_TIME		60000 /* ms */
#define HSR_ANNOUNCE_INTERVAL		  100 /* ms */

/* By how much may slave1 and slave2 timestamps of latest received frame from
 * each node differ before we notify of communication problem?
 */
#define MAX_SLAVE_DIFF			 3000 /* ms */
#define HSR_SEQNR_START			(USHRT_MAX - 1024)
#define HSR_SUP_SEQNR_START		(HSR_SEQNR_START / 2)

/* How often shall we check for broken ring and remove node entries older than
 * HSR_NODE_FORGET_TIME?
 */
#define PRUNE_PERIOD			 3000 /* ms */

#define HSR_TLV_ANNOUNCE		   22
#define HSR_TLV_LIFE_CHECK		   23

/* HSR Tag.
 * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
 * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
 * h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
 * encapsulated protocol } instead.
 *
 * Field names as defined in the IEC:2010 standard for HSR.
 */
struct hsr_tag {
	__be16		path_and_LSDU_size;
	__be16		sequence_nr;
	__be16		encap_proto;
} __packed;

#define HSR_HLEN	6

#define HSR_V1_SUP_LSDUSIZE		52

/* The helper functions below assumes that 'path' occupies the 4 most
 * significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
 * equivalently, the 4 most significant bits of HSR tag byte 14).
 *
 * This is unclear in the IEC specification; its definition of MAC addresses
 * indicates the spec is written with the least significant bit first (to the
 * left). This, however, would mean that the LSDU field would be split in two
 * with the path field in-between, which seems strange. I'm guessing the MAC
 * address definition is in error.
 */
static inline u16 get_hsr_tag_path(struct hsr_tag *ht)
{
	return ntohs(ht->path_and_LSDU_size) >> 12;
}

static inline u16 get_hsr_tag_LSDU_size(struct hsr_tag *ht)
{
	return ntohs(ht->path_and_LSDU_size) & 0x0FFF;
}

static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
{
	ht->path_and_LSDU_size =
		htons((ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
}

static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
{
	ht->path_and_LSDU_size = htons((ntohs(ht->path_and_LSDU_size) &
				       0xF000) | (LSDU_size & 0x0FFF));
}

struct hsr_ethhdr {
	struct ethhdr	ethhdr;
	struct hsr_tag	hsr_tag;
} __packed;

/* HSR Supervision Frame data types.
 * Field names as defined in the IEC:2010 standard for HSR.
 */
struct hsr_sup_tag {
	__be16		path_and_HSR_ver;
	__be16		sequence_nr;
	__u8		HSR_TLV_type;
	__u8		HSR_TLV_length;
} __packed;

struct hsr_sup_payload {
	unsigned char	macaddress_A[ETH_ALEN];
} __packed;

static inline u16 get_hsr_stag_path(struct hsr_sup_tag *hst)
{
	return get_hsr_tag_path((struct hsr_tag *)hst);
}

static inline u16 get_hsr_stag_HSR_ver(struct hsr_sup_tag *hst)
{
	return get_hsr_tag_LSDU_size((struct hsr_tag *)hst);
}

static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
{
	set_hsr_tag_path((struct hsr_tag *)hst, path);
}

static inline void set_hsr_stag_HSR_ver(struct hsr_sup_tag *hst, u16 HSR_ver)
{
	set_hsr_tag_LSDU_size((struct hsr_tag *)hst, HSR_ver);
}

struct hsrv0_ethhdr_sp {
	struct ethhdr		ethhdr;
	struct hsr_sup_tag	hsr_sup;
} __packed;

struct hsrv1_ethhdr_sp {
	struct ethhdr		ethhdr;
	struct hsr_tag		hsr;
	struct hsr_sup_tag	hsr_sup;
} __packed;

enum hsr_port_type {
	HSR_PT_NONE = 0,	/* Must be 0, used by framereg */
	HSR_PT_SLAVE_A,
	HSR_PT_SLAVE_B,
	HSR_PT_INTERLINK,
	HSR_PT_MASTER,
	HSR_PT_PORTS,	/* This must be the last item in the enum */
};

struct hsr_port {
	struct list_head	port_list;
	struct net_device	*dev;
	struct hsr_priv		*hsr;
	enum hsr_port_type	type;
};

struct hsr_priv {
	struct rcu_head		rcu_head;
	struct list_head	ports;
	struct list_head	node_db;	/* Known HSR nodes */
	struct list_head	self_node_db;	/* MACs of slaves */
	struct timer_list	announce_timer;	/* Supervision frame dispatch */
	struct timer_list	prune_timer;
	int announce_count;
	u16 sequence_nr;
	u16 sup_sequence_nr;	/* For HSRv1 separate seq_nr for supervision */
	u8 prot_version;		/* Indicate if HSRv0 or HSRv1. */
	spinlock_t seqnr_lock;			/* locking for sequence_nr */
	unsigned char		sup_multicast_addr[ETH_ALEN];
#ifdef	CONFIG_DEBUG_FS
	struct dentry *node_tbl_root;
	struct dentry *node_tbl_file;
#endif
};

#define hsr_for_each_port(hsr, port) \
	list_for_each_entry_rcu((port), &(hsr)->ports, port_list)

struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt);

/* Caller must ensure skb is a valid HSR frame */
static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
{
	struct hsr_ethhdr *hsr_ethhdr;

	hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
	return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
}

#if IS_ENABLED(CONFIG_DEBUG_FS)
int hsr_debugfs_init(struct hsr_priv *priv);
void hsr_debugfs_term(struct hsr_priv *priv);
#else
static inline int hsr_debugfs_init(struct hsr_priv *priv)
{
	return 0;
}

static inline void hsr_debugfs_term(struct hsr_priv *priv)
{}
#endif

#endif /*  __HSR_PRIVATE_H */