184 lines
4.9 KiB
C
184 lines
4.9 KiB
C
/* Copyright 2011-2014 Autronica Fire and Security AS
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*/
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#ifndef __HSR_PRIVATE_H
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#define __HSR_PRIVATE_H
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#include <linux/netdevice.h>
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#include <linux/list.h>
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/* Time constants as specified in the HSR specification (IEC-62439-3 2010)
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* Table 8.
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* All values in milliseconds.
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*/
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#define HSR_LIFE_CHECK_INTERVAL 2000 /* ms */
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#define HSR_NODE_FORGET_TIME 60000 /* ms */
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#define HSR_ANNOUNCE_INTERVAL 100 /* ms */
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/* By how much may slave1 and slave2 timestamps of latest received frame from
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* each node differ before we notify of communication problem?
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*/
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#define MAX_SLAVE_DIFF 3000 /* ms */
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#define HSR_SEQNR_START (USHRT_MAX - 1024)
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/* How often shall we check for broken ring and remove node entries older than
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* HSR_NODE_FORGET_TIME?
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*/
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#define PRUNE_PERIOD 3000 /* ms */
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#define HSR_TLV_ANNOUNCE 22
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#define HSR_TLV_LIFE_CHECK 23
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/* HSR Tag.
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* As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
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* path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
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* h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr,
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* encapsulated protocol } instead.
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*
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* Field names as defined in the IEC:2010 standard for HSR.
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*/
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struct hsr_tag {
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__be16 path_and_LSDU_size;
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__be16 sequence_nr;
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__be16 encap_proto;
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} __packed;
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#define HSR_HLEN 6
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/* The helper functions below assumes that 'path' occupies the 4 most
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* significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or
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* equivalently, the 4 most significant bits of HSR tag byte 14).
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*
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* This is unclear in the IEC specification; its definition of MAC addresses
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* indicates the spec is written with the least significant bit first (to the
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* left). This, however, would mean that the LSDU field would be split in two
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* with the path field in-between, which seems strange. I'm guessing the MAC
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* address definition is in error.
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*/
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static inline u16 get_hsr_tag_path(struct hsr_tag *ht)
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{
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return ntohs(ht->path_and_LSDU_size) >> 12;
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}
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static inline u16 get_hsr_tag_LSDU_size(struct hsr_tag *ht)
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{
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return ntohs(ht->path_and_LSDU_size) & 0x0FFF;
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}
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static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
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{
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ht->path_and_LSDU_size = htons(
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(ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
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}
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static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
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{
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ht->path_and_LSDU_size = htons(
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(ntohs(ht->path_and_LSDU_size) & 0xF000) |
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(LSDU_size & 0x0FFF));
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}
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struct hsr_ethhdr {
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struct ethhdr ethhdr;
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struct hsr_tag hsr_tag;
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} __packed;
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/* HSR Supervision Frame data types.
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* Field names as defined in the IEC:2010 standard for HSR.
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*/
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struct hsr_sup_tag {
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__be16 path_and_HSR_Ver;
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__be16 sequence_nr;
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__u8 HSR_TLV_Type;
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__u8 HSR_TLV_Length;
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} __packed;
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struct hsr_sup_payload {
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unsigned char MacAddressA[ETH_ALEN];
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} __packed;
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static inline u16 get_hsr_stag_path(struct hsr_sup_tag *hst)
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{
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return get_hsr_tag_path((struct hsr_tag *) hst);
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}
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static inline u16 get_hsr_stag_HSR_ver(struct hsr_sup_tag *hst)
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{
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return get_hsr_tag_LSDU_size((struct hsr_tag *) hst);
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}
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static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
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{
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set_hsr_tag_path((struct hsr_tag *) hst, path);
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}
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static inline void set_hsr_stag_HSR_Ver(struct hsr_sup_tag *hst, u16 HSR_Ver)
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{
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set_hsr_tag_LSDU_size((struct hsr_tag *) hst, HSR_Ver);
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}
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struct hsr_ethhdr_sp {
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struct ethhdr ethhdr;
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struct hsr_sup_tag hsr_sup;
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} __packed;
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enum hsr_port_type {
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HSR_PT_NONE = 0, /* Must be 0, used by framereg */
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HSR_PT_SLAVE_A,
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HSR_PT_SLAVE_B,
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HSR_PT_INTERLINK,
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HSR_PT_MASTER,
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HSR_PT_PORTS, /* This must be the last item in the enum */
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};
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struct hsr_port {
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struct list_head port_list;
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struct net_device *dev;
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struct hsr_priv *hsr;
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enum hsr_port_type type;
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};
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struct hsr_priv {
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struct rcu_head rcu_head;
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struct list_head ports;
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struct list_head node_db; /* Known HSR nodes */
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struct list_head self_node_db; /* MACs of slaves */
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struct timer_list announce_timer; /* Supervision frame dispatch */
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struct timer_list prune_timer;
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int announce_count;
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u16 sequence_nr;
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spinlock_t seqnr_lock; /* locking for sequence_nr */
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unsigned char sup_multicast_addr[ETH_ALEN];
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};
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#define hsr_for_each_port(hsr, port) \
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list_for_each_entry_rcu((port), &(hsr)->ports, port_list)
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struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt);
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/* Caller must ensure skb is a valid HSR frame */
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static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
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{
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struct hsr_ethhdr *hsr_ethhdr;
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hsr_ethhdr = (struct hsr_ethhdr *) skb_mac_header(skb);
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return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
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}
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#endif /* __HSR_PRIVATE_H */
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