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Diffstat (limited to 'net/hsr/hsr_main.h')
| -rw-r--r-- | net/hsr/hsr_main.h | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h new file mode 100644 index 000000000..58a5a8b38 --- /dev/null +++ b/net/hsr/hsr_main.h @@ -0,0 +1,287 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright 2011-2014 Autronica Fire and Security AS + * + * Author(s): + * 2011-2014 Arvid Brodin, arvid.brodin@alten.se + * + * include file for HSR and PRP. + */ + +#ifndef __HSR_PRIVATE_H +#define __HSR_PRIVATE_H + +#include <linux/netdevice.h> +#include <linux/list.h> +#include <linux/if_vlan.h> +#include <linux/if_hsr.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 */ +#define HSR_ENTRY_FORGET_TIME 400 /* 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_EOT 0 /* End of TLVs */ +#define HSR_TLV_ANNOUNCE 22 +#define HSR_TLV_LIFE_CHECK 23 +/* PRP V1 life check for Duplicate discard */ +#define PRP_TLV_LIFE_CHECK_DD 20 +/* PRP V1 life check for Duplicate Accept */ +#define PRP_TLV_LIFE_CHECK_DA 21 +/* PRP V1 life redundancy box MAC address */ +#define PRP_TLV_REDBOX_MAC 30 + +#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 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; + +struct hsr_vlan_ethhdr { + struct vlan_ethhdr vlanhdr; + struct hsr_tag hsr_tag; +} __packed; + +struct hsr_sup_tlv { + u8 HSR_TLV_type; + u8 HSR_TLV_length; +} __packed; + +/* HSR/PRP 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; + struct hsr_sup_tlv tlv; +} __packed; + +struct hsr_sup_payload { + unsigned char macaddress_A[ETH_ALEN]; +} __packed; + +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 */ +}; + +/* PRP Redunancy Control Trailor (RCT). + * As defined in IEC-62439-4:2012, the PRP RCT is really { sequence Nr, + * Lan indentifier (LanId), LSDU_size and PRP_suffix = 0x88FB }. + * + * Field names as defined in the IEC:2012 standard for PRP. + */ +struct prp_rct { + __be16 sequence_nr; + __be16 lan_id_and_LSDU_size; + __be16 PRP_suffix; +} __packed; + +static inline u16 get_prp_LSDU_size(struct prp_rct *rct) +{ + return ntohs(rct->lan_id_and_LSDU_size) & 0x0FFF; +} + +static inline void set_prp_lan_id(struct prp_rct *rct, u16 lan_id) +{ + rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) & + 0x0FFF) | (lan_id << 12)); +} +static inline void set_prp_LSDU_size(struct prp_rct *rct, u16 LSDU_size) +{ + rct->lan_id_and_LSDU_size = htons((ntohs(rct->lan_id_and_LSDU_size) & + 0xF000) | (LSDU_size & 0x0FFF)); +} + +struct hsr_port { + struct list_head port_list; + struct net_device *dev; + struct hsr_priv *hsr; + enum hsr_port_type type; +}; + +struct hsr_frame_info; +struct hsr_node; + +struct hsr_proto_ops { + /* format and send supervision frame */ + void (*send_sv_frame)(struct hsr_port *port, unsigned long *interval); + void (*handle_san_frame)(bool san, enum hsr_port_type port, + struct hsr_node *node); + bool (*drop_frame)(struct hsr_frame_info *frame, struct hsr_port *port); + struct sk_buff * (*get_untagged_frame)(struct hsr_frame_info *frame, + struct hsr_port *port); + struct sk_buff * (*create_tagged_frame)(struct hsr_frame_info *frame, + struct hsr_port *port); + int (*fill_frame_info)(__be16 proto, struct sk_buff *skb, + struct hsr_frame_info *frame); + bool (*invalid_dan_ingress_frame)(__be16 protocol); + void (*update_san_info)(struct hsr_node *node, bool is_sup); +}; + +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 */ + enum hsr_version prot_version; /* Indicate if HSRv0, HSRv1 or PRPv1 */ + spinlock_t seqnr_lock; /* locking for sequence_nr */ + spinlock_t list_lock; /* locking for node list */ + struct hsr_proto_ops *proto_ops; +#define PRP_LAN_ID 0x5 /* 0x1010 for A and 0x1011 for B. Bit 0 is set + * based on SLAVE_A or SLAVE_B + */ + u8 net_id; /* for PRP, it occupies most significant 3 bits + * of lan_id + */ + unsigned char sup_multicast_addr[ETH_ALEN] __aligned(sizeof(u16)); + /* Align to u16 boundary to avoid unaligned access + * in ether_addr_equal + */ +#ifdef CONFIG_DEBUG_FS + struct dentry *node_tbl_root; +#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); +} + +static inline struct prp_rct *skb_get_PRP_rct(struct sk_buff *skb) +{ + unsigned char *tail = skb_tail_pointer(skb) - HSR_HLEN; + + struct prp_rct *rct = (struct prp_rct *)tail; + + if (rct->PRP_suffix == htons(ETH_P_PRP)) + return rct; + + return NULL; +} + +/* Assume caller has confirmed this skb is PRP suffixed */ +static inline u16 prp_get_skb_sequence_nr(struct prp_rct *rct) +{ + return ntohs(rct->sequence_nr); +} + +/* assume there is a valid rct */ +static inline bool prp_check_lsdu_size(struct sk_buff *skb, + struct prp_rct *rct, + bool is_sup) +{ + struct ethhdr *ethhdr; + int expected_lsdu_size; + + if (is_sup) { + expected_lsdu_size = HSR_V1_SUP_LSDUSIZE; + } else { + ethhdr = (struct ethhdr *)skb_mac_header(skb); + expected_lsdu_size = skb->len - 14; + if (ethhdr->h_proto == htons(ETH_P_8021Q)) + expected_lsdu_size -= 4; + } + + return (expected_lsdu_size == get_prp_LSDU_size(rct)); +} + +#if IS_ENABLED(CONFIG_DEBUG_FS) +void hsr_debugfs_rename(struct net_device *dev); +void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev); +void hsr_debugfs_term(struct hsr_priv *priv); +void hsr_debugfs_create_root(void); +void hsr_debugfs_remove_root(void); +#else +static inline void hsr_debugfs_rename(struct net_device *dev) +{ +} +static inline void hsr_debugfs_init(struct hsr_priv *priv, + struct net_device *hsr_dev) +{} +static inline void hsr_debugfs_term(struct hsr_priv *priv) +{} +static inline void hsr_debugfs_create_root(void) +{} +static inline void hsr_debugfs_remove_root(void) +{} +#endif + +#endif /* __HSR_PRIVATE_H */ |