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/* Copyright 2011-2014 Autronica Fire and Security AS
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* 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)
/* 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
/* 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 MacAddressA[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 hsr_ethhdr_sp {
struct ethhdr ethhdr;
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;
spinlock_t seqnr_lock; /* locking for sequence_nr */
unsigned char sup_multicast_addr[ETH_ALEN];
};
#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);
}
#endif /* __HSR_PRIVATE_H */
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