/*
 * Copyright (c) 2020 Cisco and/or its affiliates.
 * 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 __LCP_ITF_PAIR_H__
#define __LCP_ITF_PAIR_H__

#include <vnet/dpo/dpo.h>
#include <vnet/adj/adj.h>
#include <vnet/ip/ip_types.h>

#include <plugins/linux-cp/lcp.h>

extern vlib_log_class_t lcp_itf_pair_logger;

#define LCP_ITF_PAIR_DBG(...)                                                 \
  vlib_log_debug (lcp_itf_pair_logger, __VA_ARGS__);

#define LCP_ITF_PAIR_INFO(...)                                                \
  vlib_log_info (lcp_itf_pair_logger, __VA_ARGS__);

#define LCP_ITF_PAIR_NOTICE(...)                                              \
  vlib_log_notice (lcp_itf_pair_logger, __VA_ARGS__);

#define LCP_ITF_PAIR_WARN(...)                                                \
  vlib_log_warn (lcp_itf_pair_logger, __VA_ARGS__);

#define LCP_ITF_PAIR_ERR(...) vlib_log_err (lcp_itf_pair_logger, __VA_ARGS__);

#define foreach_lcp_itf_pair_flag _ (STALE, 0, "stale")

typedef enum lip_flag_t_
{
#define _(a, b, c) LIP_FLAG_##a = (1 << b),
  foreach_lcp_itf_pair_flag
#undef _
} lip_flag_t;

typedef enum
{
  LCP_ITF_HOST_TAP = 0,
  LCP_ITF_HOST_TUN = 1,
} lip_host_type_t;

#define N_LCP_ITF_HOST (LCP_ITF_HOST_TUN + 1)

typedef struct lcp_itf_phy_adj
{
  adj_index_t adj_index[N_AF];
} lcp_itf_phy_adj_t;

/**
 * A pair of interfaces
 */
typedef struct lcp_itf_pair_t_
{
  u32 lip_host_sw_if_index;	  /* VPP's sw_if_index for the host tap */
  u32 lip_phy_sw_if_index;	  /* VPP's sw_if_index for the phy */
  u8 *lip_host_name;		  /* linux's name for the tap */
  u32 lip_vif_index;		  /* linux's index for the tap */
  u8 *lip_namespace;		  /* namespace in which the tap lives */
  lip_host_type_t lip_host_type;  /* type of host interface */
  lcp_itf_phy_adj_t lip_phy_adjs; /* adjacencies for phy l3 interface */
  lip_flag_t lip_flags;		  /* Flags */
  u8 lip_rewrite_len;		  /* The length of an L2 MAC rewrite */
  f64 lip_create_ts;		  /* Timestamp of creation */
} lcp_itf_pair_t;
extern lcp_itf_pair_t *lcp_itf_pair_pool;

extern vlib_node_registration_t lcp_ethernet_node;

u8 *format_lcp_itf_pair (u8 *s, va_list *args);
void lcp_itf_pair_show (u32 phy_sw_if_index);
u32 lcp_itf_num_pairs (void);

/**
 * Get an interface-pair object from its VPP index
 */
extern lcp_itf_pair_t *lcp_itf_pair_get (index_t index);

/**
 * Find a interface-pair object from the host interface
 *
 * @param host_sw_if_index host interface
 * @return VPP's object index
 */
extern index_t lcp_itf_pair_find_by_vif (u32 vif_index);

/**
 * Create an interface-pair
 *
 * @return error code
 */
extern int lcp_itf_pair_add (u32 host_sw_if_index, u32 phy_sw_if_index,
			     u8 *host_name, u32 host_index,
			     lip_host_type_t host_type, u8 *ns);
extern int lcp_itf_pair_del (u32 phy_sw_if_index);

/**
 * Create an interface-pair from PHY sw_if_index and tap name.
 *
 * @return error code
 */
extern int lcp_itf_pair_create (u32 phy_sw_if_index, u8 *host_if_name,
				lip_host_type_t host_if_type, u8 *ns,
				u32 *host_sw_if_indexp);

/**
 * Delete a LCP_ITF_PAIR
 */
extern int lcp_itf_pair_delete (u32 phy_sw_if_index);

/**
 * Callback function invoked during a walk of all interface-pairs
 */
typedef walk_rc_t (*lcp_itf_pair_walk_cb_t) (index_t index, void *ctx);

/**
 * Walk/visit each of the interface pairs
 */
extern void lcp_itf_pair_walk (lcp_itf_pair_walk_cb_t cb, void *ctx);

/**
 * Begin and End the replace process
 */
extern int lcp_itf_pair_replace_begin (void);
extern int lcp_itf_pair_replace_end (void);

/**
 * Retreive the pair in the DP
 */
extern index_t *lip_db_by_phy;
extern u32 *lip_db_by_host;

always_inline index_t
lcp_itf_pair_find_by_phy (u32 phy_sw_if_index)
{
  if (phy_sw_if_index >= vec_len (lip_db_by_phy))
    return INDEX_INVALID;
  return (lip_db_by_phy[phy_sw_if_index]);
}

always_inline index_t
lcp_itf_pair_find_by_host (u32 host_sw_if_index)
{
  if (host_sw_if_index >= vec_len (lip_db_by_host))
    return INDEX_INVALID;
  return (lip_db_by_host[host_sw_if_index]);
}

typedef void (*lcp_itf_pair_add_cb_t) (lcp_itf_pair_t *);
typedef void (*lcp_itf_pair_del_cb_t) (lcp_itf_pair_t *);

typedef struct lcp_itf_pair_vft
{
  lcp_itf_pair_add_cb_t pair_add_fn;
  lcp_itf_pair_del_cb_t pair_del_fn;
} lcp_itf_pair_vft_t;

void lcp_itf_pair_register_vft (lcp_itf_pair_vft_t *lcp_itf_vft);

/**
 * sub-interface auto creation/deletion for LCP
 */
void lcp_set_auto_subint (u8 is_auto);
int lcp_auto_subint (void);

/**
 * sync state changes from VPP into LCP
 */
void lcp_set_sync (u8 is_auto);
int lcp_sync (void);

/* Set TAP and Linux host link state */
void lcp_itf_set_link_state (const lcp_itf_pair_t *lip, u8 state);

/* Set any VPP L3 addresses on Linux host device */
void lcp_itf_set_interface_addr (const lcp_itf_pair_t *lip);

/* Sync all state from VPP to a specific Linux device, all sub-interfaces
 * of a hardware interface, or all interfaces in the system.
 *
 * Note: in some circumstances, this syncer will (have to) make changes to
 * the VPP interface, for example if its MTU is greater than its parent.
 * See the function for rationale.
 */
void lcp_itf_pair_sync_state (lcp_itf_pair_t *lip);
void lcp_itf_pair_sync_state_hw (vnet_hw_interface_t *hi);
void lcp_itf_pair_sync_state_all ();

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */

#endif