/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
 */

#ifndef _NET_BOND_3AD_H
#define _NET_BOND_3AD_H

#include <asm/byteorder.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_ether.h>

/* General definitions */
#define PKT_TYPE_LACPDU         cpu_to_be16(ETH_P_SLOW)
#define AD_TIMER_INTERVAL       100 /*msec*/

#define AD_LACP_SLOW 0
#define AD_LACP_FAST 1

typedef struct mac_addr {
        u8 mac_addr_value[ETH_ALEN];
} __packed mac_addr_t;

enum {
        BOND_AD_STABLE = 0,
        BOND_AD_BANDWIDTH = 1,
        BOND_AD_COUNT = 2,
        BOND_AD_PRIO = 3,
};

/* rx machine states(43.4.11 in the 802.3ad standard) */
typedef enum {
        AD_RX_DUMMY,
        AD_RX_INITIALIZE,       /* rx Machine */
        AD_RX_PORT_DISABLED,    /* rx Machine */
        AD_RX_LACP_DISABLED,    /* rx Machine */
        AD_RX_EXPIRED,          /* rx Machine */
        AD_RX_DEFAULTED,        /* rx Machine */
        AD_RX_CURRENT           /* rx Machine */
} rx_states_t;

/* periodic machine states(43.4.12 in the 802.3ad standard) */
typedef enum {
        AD_PERIODIC_DUMMY,
        AD_NO_PERIODIC,         /* periodic machine */
        AD_FAST_PERIODIC,       /* periodic machine */
        AD_SLOW_PERIODIC,       /* periodic machine */
        AD_PERIODIC_TX          /* periodic machine */
} periodic_states_t;

/* mux machine states(43.4.13 in the 802.3ad standard) */
typedef enum {
        AD_MUX_DUMMY,
        AD_MUX_DETACHED,        /* mux machine */
        AD_MUX_WAITING,         /* mux machine */
        AD_MUX_ATTACHED,        /* mux machine */
        AD_MUX_COLLECTING,      /* mux machine */
        AD_MUX_DISTRIBUTING,    /* mux machine */
        AD_MUX_COLLECTING_DISTRIBUTING  /* mux machine */
} mux_states_t;

/* tx machine states(43.4.15 in the 802.3ad standard) */
typedef enum {
        AD_TX_DUMMY,
        AD_TRANSMIT             /* tx Machine */
} tx_states_t;

/* churn machine states(43.4.17 in the 802.3ad standard) */
typedef enum {
         AD_CHURN_MONITOR, /* monitoring for churn */
         AD_CHURN,         /* churn detected (error) */
         AD_NO_CHURN       /* no churn (no error) */
} churn_state_t;

/* rx indication types */
typedef enum {
        AD_TYPE_LACPDU = 1,     /* type lacpdu */
        AD_TYPE_MARKER          /* type marker */
} pdu_type_t;

/* rx marker indication types */
typedef enum {
        AD_MARKER_INFORMATION_SUBTYPE = 1,      /* marker imformation subtype */
        AD_MARKER_RESPONSE_SUBTYPE              /* marker response subtype */
} bond_marker_subtype_t;

/* timers types(43.4.9 in the 802.3ad standard) */
typedef enum {
        AD_CURRENT_WHILE_TIMER,
        AD_ACTOR_CHURN_TIMER,
        AD_PERIODIC_TIMER,
        AD_PARTNER_CHURN_TIMER,
        AD_WAIT_WHILE_TIMER
} ad_timers_t;

#pragma pack(1)

/* Link Aggregation Control Protocol(LACP) data unit structure(43.4.2.2 in the 802.3ad standard) */
typedef struct lacpdu {
        u8 subtype;             /* = LACP(= 0x01) */
        u8 version_number;
        u8 tlv_type_actor_info; /* = actor information(type/length/value) */
        u8 actor_information_length;    /* = 20 */
        __be16 actor_system_priority;
        struct mac_addr actor_system;
        __be16 actor_key;
        __be16 actor_port_priority;
        __be16 actor_port;
        u8 actor_state;
        u8 reserved_3_1[3];             /* = 0 */
        u8 tlv_type_partner_info;       /* = partner information */
        u8 partner_information_length;  /* = 20 */
        __be16 partner_system_priority;
        struct mac_addr partner_system;
        __be16 partner_key;
        __be16 partner_port_priority;
        __be16 partner_port;
        u8 partner_state;
        u8 reserved_3_2[3];             /* = 0 */
        u8 tlv_type_collector_info;     /* = collector information */
        u8 collector_information_length;/* = 16 */
        __be16 collector_max_delay;
        u8 reserved_12[12];
        u8 tlv_type_terminator;         /* = terminator */
        u8 terminator_length;           /* = 0 */
        u8 reserved_50[50];             /* = 0 */
} __packed lacpdu_t;

typedef struct lacpdu_header {
        struct ethhdr hdr;
        struct lacpdu lacpdu;
} __packed lacpdu_header_t;

/* Marker Protocol Data Unit(PDU) structure(43.5.3.2 in the 802.3ad standard) */
typedef struct bond_marker {
        u8 subtype;             /* = 0x02  (marker PDU) */
        u8 version_number;      /* = 0x01 */
        u8 tlv_type;            /* = 0x01  (marker information) */
        /* = 0x02  (marker response information) */
        u8 marker_length;       /* = 0x16 */
        u16 requester_port;     /* The number assigned to the port by the requester */
        struct mac_addr requester_system;       /* The requester's system id */
        u32 requester_transaction_id;           /* The transaction id allocated by the requester, */
        u16 pad;                /* = 0 */
        u8 tlv_type_terminator; /* = 0x00 */
        u8 terminator_length;   /* = 0x00 */
        u8 reserved_90[90];     /* = 0 */
} __packed bond_marker_t;

typedef struct bond_marker_header {
        struct ethhdr hdr;
        struct bond_marker marker;
} __packed bond_marker_header_t;

#pragma pack()

struct slave;
struct bonding;
struct ad_info;
struct port;

#ifdef __ia64__
#pragma pack(8)
#endif

struct bond_3ad_stats {
        atomic64_t lacpdu_rx;
        atomic64_t lacpdu_tx;
        atomic64_t lacpdu_unknown_rx;
        atomic64_t lacpdu_illegal_rx;

        atomic64_t marker_rx;
        atomic64_t marker_tx;
        atomic64_t marker_resp_rx;
        atomic64_t marker_resp_tx;
        atomic64_t marker_unknown_rx;
};

/* aggregator structure(43.4.5 in the 802.3ad standard) */
typedef struct aggregator {
        struct mac_addr aggregator_mac_address;
        u16 aggregator_identifier;
        bool is_individual;
        u16 actor_admin_aggregator_key;
        u16 actor_oper_aggregator_key;
        struct mac_addr partner_system;
        u16 partner_system_priority;
        u16 partner_oper_aggregator_key;
        u16 receive_state;      /* BOOLEAN */
        u16 transmit_state;     /* BOOLEAN */
        struct port *lag_ports;
        /* ****** PRIVATE PARAMETERS ****** */
        struct slave *slave;    /* pointer to the bond slave that this aggregator belongs to */
        u16 is_active;          /* BOOLEAN. Indicates if this aggregator is active */
        u16 num_of_ports;
} aggregator_t;

struct port_params {
        struct mac_addr system;
        u16 system_priority;
        u16 key;
        u16 port_number;
        u16 port_priority;
        u16 port_state;
};

/* port structure(43.4.6 in the 802.3ad standard) */
typedef struct port {
        u16 actor_port_number;
        u16 actor_port_priority;
        struct mac_addr actor_system;   /* This parameter is added here although it is not specified in the standard, just for simplification */
        u16 actor_system_priority;      /* This parameter is added here although it is not specified in the standard, just for simplification */
        u16 actor_port_aggregator_identifier;
        bool ntt;
        u16 actor_admin_port_key;
        u16 actor_oper_port_key;
        u8 actor_admin_port_state;
        u8 actor_oper_port_state;

        struct port_params partner_admin;
        struct port_params partner_oper;

        bool is_enabled;

        /* ****** PRIVATE PARAMETERS ****** */
        u16 sm_vars;            /* all state machines variables for this port */
        rx_states_t sm_rx_state;        /* state machine rx state */
        u16 sm_rx_timer_counter;        /* state machine rx timer counter */
        periodic_states_t sm_periodic_state;    /* state machine periodic state */
        u16 sm_periodic_timer_counter;  /* state machine periodic timer counter */
        mux_states_t sm_mux_state;      /* state machine mux state */
        u16 sm_mux_timer_counter;       /* state machine mux timer counter */
        tx_states_t sm_tx_state;        /* state machine tx state */
        u16 sm_tx_timer_counter;        /* state machine tx timer counter
                                         * (always on - enter to transmit
                                         *  state 3 time per second)
                                         */
        u16 sm_churn_actor_timer_counter;
        u16 sm_churn_partner_timer_counter;
        u32 churn_actor_count;
        u32 churn_partner_count;
        churn_state_t sm_churn_actor_state;
        churn_state_t sm_churn_partner_state;
        struct slave *slave;            /* pointer to the bond slave that this port belongs to */
        struct aggregator *aggregator;  /* pointer to an aggregator that this port related to */
        struct port *next_port_in_aggregator;   /* Next port on the linked list of the parent aggregator */
        u32 transaction_id;             /* continuous number for identification of Marker PDU's; */
        struct lacpdu lacpdu;           /* the lacpdu that will be sent for this port */
} port_t;

/* system structure */
struct ad_system {
        u16 sys_priority;
        struct mac_addr sys_mac_addr;
};

#ifdef __ia64__
#pragma pack()
#endif

/* ========== AD Exported structures to the main bonding code ========== */
#define BOND_AD_INFO(bond)   ((bond)->ad_info)
#define SLAVE_AD_INFO(slave) ((slave)->ad_info)

struct ad_bond_info {
        struct ad_system system;        /* 802.3ad system structure */
        struct bond_3ad_stats stats;
        atomic_t agg_select_timer;              /* Timer to select aggregator after all adapter's hand shakes */
        u16 aggregator_identifier;
};

struct ad_slave_info {
        struct aggregator aggregator;   /* 802.3ad aggregator structure */
        struct port port;               /* 802.3ad port structure */
        struct bond_3ad_stats stats;
        u16 id;
        u16 port_priority;
};

static inline const char *bond_3ad_churn_desc(churn_state_t state)
{
        static const char *const churn_description[] = {
                "monitoring",
                "churned",
                "none",
                "unknown"
        };
        int max_size = ARRAY_SIZE(churn_description);

        if (state >= max_size)
                state = max_size - 1;

        return churn_description[state];
}

/* ========== AD Exported functions to the main bonding code ========== */
void bond_3ad_initialize(struct bonding *bond);
void bond_3ad_bind_slave(struct slave *slave);
void bond_3ad_unbind_slave(struct slave *slave);
void bond_3ad_state_machine_handler(struct work_struct *);
void bond_3ad_initiate_agg_selection(struct bonding *bond, int timeout);
void bond_3ad_adapter_speed_duplex_changed(struct slave *slave);
void bond_3ad_handle_link_change(struct slave *slave, char link);
int  bond_3ad_get_active_agg_info(struct bonding *bond, struct ad_info *ad_info);
int  __bond_3ad_get_active_agg_info(struct bonding *bond,
                                    struct ad_info *ad_info);
int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
                         struct slave *slave);
int bond_3ad_set_carrier(struct bonding *bond);
void bond_3ad_update_lacp_rate(struct bonding *bond);
void bond_3ad_update_lacp_active(struct bonding *bond);
void bond_3ad_update_ad_actor_settings(struct bonding *bond);
int bond_3ad_stats_fill(struct sk_buff *skb, struct bond_3ad_stats *stats);
size_t bond_3ad_stats_size(void);
#endif /* _NET_BOND_3AD_H */