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Release 4.11 net/hsr/hsr_main.h

Directory: net/hsr
/* 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)

#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; }

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

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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)); }

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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)); }

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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); }

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

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

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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); }

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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 protVersion; /* Indicate if HSRv0 or HSRv1. */ 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); }

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#endif /* __HSR_PRIVATE_H */

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Directory: net/hsr
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