net/hsr/hsr_main.h

   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  */
  54 struct 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  */
  74 static inline u16 get_hsr_tag_path(struct hsr_tag *ht)
  75 {
  76         return ntohs(ht->path_and_LSDU_size) >> 12;
  77 }
  78
  79 static inline u16 get_hsr_tag_LSDU_size(struct hsr_tag *ht)
  80 {
  81         return ntohs(ht->path_and_LSDU_size) & 0x0FFF;
  82 }
  83
  84 static 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
  90 static 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
  97 struct 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  */
 106 struct 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
 113 struct hsr_sup_payload {
 114         unsigned char   MacAddressA[ETH_ALEN];
 115 } __packed;
 116
 117 static inline u16 get_hsr_stag_path(struct hsr_sup_tag *hst)
 118 {
 119         return get_hsr_tag_path((struct hsr_tag *) hst);
 120 }
 121
 122 static 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
 127 static 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
 132 static 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
 137 struct hsrv0_ethhdr_sp {
 138         struct ethhdr           ethhdr;
 139         struct hsr_sup_tag      hsr_sup;
 140 } __packed;
 141
 142 struct hsrv1_ethhdr_sp {
 143         struct ethhdr           ethhdr;
 144         struct hsr_tag          hsr;
 145         struct hsr_sup_tag      hsr_sup;
 146 } __packed;
 147
 148
 149 enum 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
 158 struct 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
 165 struct 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
 183 struct 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 */
 186 static 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 */