summaryrefslogtreecommitdiffstats
path: root/net/hsr/hsr_main.h
diff options
context:
space:
mode:
Diffstat (limited to 'net/hsr/hsr_main.h')
-rw-r--r--net/hsr/hsr_main.h294
1 files changed, 294 insertions, 0 deletions
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
new file mode 100644
index 0000000000..18e01791ad
--- /dev/null
+++ b/net/hsr/hsr_main.h
@@ -0,0 +1,294 @@
+/* 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_self_node {
+ unsigned char macaddress_A[ETH_ALEN];
+ unsigned char macaddress_B[ETH_ALEN];
+ struct rcu_head rcu_head;
+};
+
+struct hsr_priv {
+ struct rcu_head rcu_head;
+ struct list_head ports;
+ struct list_head node_db; /* Known HSR nodes */
+ struct hsr_self_node __rcu *self_node; /* 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
+ */
+ bool fwd_offloaded; /* Forwarding offloaded to HW */
+ 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 */