/*
 * Copyright (c) 2011 Nicira, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef LACP_H
#define LACP_H 1

#include <stdbool.h>
#include <stdint.h>
#include "packets.h"

/* LACP Protocol Implementation. */

enum lacp_status {
    LACP_NEGOTIATED,                  /* Successful LACP negotiations. */
    LACP_CONFIGURED,                  /* LACP is enabled but not negotiated. */
    LACP_DISABLED                     /* LACP is not enabled. */
};

struct lacp_settings {
    char *name;                       /* Name (for debugging). */
    struct eth_addr id;               /* System ID. Must be nonzero. */
    uint16_t priority;                /* System priority. */
    bool active;                      /* Active or passive mode? */
    bool fast;                        /* Fast or slow probe interval. */
    bool fallback_ab_cfg;             /* Fallback to BM_SLB on LACP failure. */
};

void lacp_init(void);
struct lacp *lacp_create(void);
void lacp_unref(struct lacp *);
struct lacp *lacp_ref(const struct lacp *);

void lacp_configure(struct lacp *, const struct lacp_settings *);
bool lacp_is_active(const struct lacp *);

bool lacp_process_packet(struct lacp *, const void *member,
                         const struct dp_packet *packet);
enum lacp_status lacp_status(const struct lacp *);
const char *lacp_status_description(enum lacp_status);

struct lacp_member_settings {
    char *name;                       /* Name (for debugging). */
    uint16_t id;                      /* Port ID. */
    uint16_t priority;                /* Port priority. */
    uint16_t key;                     /* Aggregation key. */
};

void lacp_member_register(struct lacp *, void *member_,
                          const struct lacp_member_settings *);
void lacp_member_unregister(struct lacp *, const void *member);
void lacp_member_carrier_changed(const struct lacp *, const void *member,
                                 bool carrier_up);
bool lacp_member_may_enable(const struct lacp *, const void *member);
bool lacp_member_is_current(const struct lacp *, const void *member_);

/* Callback function for lacp_run() for sending a LACP PDU. */
typedef void lacp_send_pdu(void *member, const void *pdu, size_t pdu_size);

void lacp_run(struct lacp *, lacp_send_pdu *);
void lacp_wait(struct lacp *);

struct lacp_member_stats {
    /* id */
    struct eth_addr dot3adAggPortActorSystemID;
    struct eth_addr dot3adAggPortPartnerOperSystemID;
    uint32_t dot3adAggPortAttachedAggID;
    /* state */
    uint8_t dot3adAggPortActorAdminState;
    uint8_t dot3adAggPortActorOperState;
    uint8_t dot3adAggPortPartnerAdminState;
    uint8_t dot3adAggPortPartnerOperState;
    /* counters */
    uint32_t dot3adAggPortStatsLACPDUsRx;
    /* uint32_t dot3adAggPortStatsMarkerPDUsRx; */
    /* uint32_t dot3adAggPortStatsMarkerResponsePDUsRx; */
    /* uint32_t dot3adAggPortStatsUnknownRx; */
    uint32_t dot3adAggPortStatsIllegalRx;
    uint32_t dot3adAggPortStatsLACPDUsTx;
    /* uint32_t dot3adAggPortStatsMarkerPDUsTx; */
    /* uint32_t dot3adAggPortStatsMarkerResponsePDUsTx; */
};

bool lacp_get_member_stats(const struct lacp *, const void *member_,
                           struct lacp_member_stats *);

#endif /* lacp.h */