/* 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_FRAMEREG_H
#define __HSR_FRAMEREG_H

#include "hsr_main.h"

struct hsr_node;

struct hsr_frame_info {
        struct sk_buff *skb_std;
        struct sk_buff *skb_hsr;
        struct sk_buff *skb_prp;
        struct hsr_port *port_rcv;
        struct hsr_node *node_src;
        u16 sequence_nr;
        bool is_supervision;
        bool is_proxy_supervision;
        bool is_vlan;
        bool is_local_dest;
        bool is_local_exclusive;
        bool is_from_san;
};

void hsr_del_self_node(struct hsr_priv *hsr);
void hsr_del_nodes(struct list_head *node_db);
struct hsr_node *hsr_get_node(struct hsr_port *port, struct list_head *node_db,
                              struct sk_buff *skb, bool is_sup,
                              enum hsr_port_type rx_port);
void hsr_handle_sup_frame(struct hsr_frame_info *frame);
bool hsr_addr_is_self(struct hsr_priv *hsr, unsigned char *addr);
bool hsr_addr_is_redbox(struct hsr_priv *hsr, unsigned char *addr);

void hsr_addr_subst_source(struct hsr_node *node, struct sk_buff *skb);
void hsr_addr_subst_dest(struct hsr_node *node_src, struct sk_buff *skb,
                         struct hsr_port *port);

void hsr_register_frame_in(struct hsr_node *node, struct hsr_port *port,
                           u16 sequence_nr);
int hsr_register_frame_out(struct hsr_port *port, struct hsr_frame_info *frame);

void hsr_prune_nodes(struct timer_list *t);
void hsr_prune_proxy_nodes(struct timer_list *t);

int hsr_create_self_node(struct hsr_priv *hsr,
                         const unsigned char addr_a[ETH_ALEN],
                         const unsigned char addr_b[ETH_ALEN]);

void *hsr_get_next_node(struct hsr_priv *hsr, void *_pos,
                        unsigned char addr[ETH_ALEN]);

int hsr_get_node_data(struct hsr_priv *hsr,
                      const unsigned char *addr,
                      unsigned char addr_b[ETH_ALEN],
                      unsigned int *addr_b_ifindex,
                      int *if1_age,
                      u16 *if1_seq,
                      int *if2_age,
                      u16 *if2_seq);

void prp_handle_san_frame(bool san, enum hsr_port_type port,
                          struct hsr_node *node);
void prp_update_san_info(struct hsr_node *node, bool is_sup);

bool hsr_is_node_in_db(struct list_head *node_db,
                       const unsigned char addr[ETH_ALEN]);

int prp_register_frame_out(struct hsr_port *port, struct hsr_frame_info *frame);

#if IS_ENABLED(CONFIG_KUNIT)
struct hsr_seq_block *hsr_get_seq_block(struct hsr_node *node, u16 block_idx);
#endif

#define HSR_SEQ_BLOCK_SHIFT 7 /* 128 bits */
#define HSR_SEQ_BLOCK_SIZE (1 << HSR_SEQ_BLOCK_SHIFT)
#define HSR_SEQ_BLOCK_MASK (HSR_SEQ_BLOCK_SIZE - 1)
#define HSR_MAX_SEQ_BLOCKS 64

#define hsr_seq_block_index(sequence_nr) ((sequence_nr) >> HSR_SEQ_BLOCK_SHIFT)
#define hsr_seq_block_bit(sequence_nr) ((sequence_nr) & HSR_SEQ_BLOCK_MASK)

struct hsr_seq_block {
        unsigned long           time;
        u16                     block_idx;
        /* Should be a flexible array member of what DECLARE_BITMAP() would
         * produce.
         */
        unsigned long           seq_nrs[][BITS_TO_LONGS(HSR_SEQ_BLOCK_SIZE)];
};

struct hsr_node {
        struct list_head        mac_list;
        /* Protect R/W access seq_blocks */
        spinlock_t              seq_out_lock;
        unsigned char           macaddress_A[ETH_ALEN];
        unsigned char           macaddress_B[ETH_ALEN];
        /* Local slave through which AddrB frames are received from this node */
        enum hsr_port_type      addr_B_port;
        unsigned long           time_in[HSR_PT_PORTS];
        bool                    time_in_stale[HSR_PT_PORTS];
        /* if the node is a SAN */
        bool                    san_a;
        bool                    san_b;
        bool                    removed;
        /* Duplicate detection */
        struct xarray           seq_blocks;
        void                    *block_buf;
        unsigned int            next_block;
        unsigned int            seq_port_cnt;
        struct rcu_head         rcu_head;
};

static inline size_t hsr_seq_block_size(struct hsr_node *node)
{
        WARN_ON_ONCE(node->seq_port_cnt == 0);
        return struct_size_t(struct hsr_seq_block, seq_nrs, node->seq_port_cnt);
}

#endif /* __HSR_FRAMEREG_H */