/*
 * Copyright (c) 2017 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 PLUGINS_IOAM_PLUGIN_IOAM_ANALYSE_IP6_IOAM_ANALYSE_NODE_H_
#define PLUGINS_IOAM_PLUGIN_IOAM_ANALYSE_IP6_IOAM_ANALYSE_NODE_H_

#include <ioam/analyse/ioam_analyse.h>
#include <vnet/ip/ip6_hop_by_hop.h>
#include <ioam/encap/ip6_ioam_trace.h>

/** @brief IP6-iOAM analyser main structure.
    @note cache aligned.
*/
typedef struct
{
  /** Array of function pointer to analyse each hop-by-hop option. */
  int (*analyse_hbh_handler[MAX_IP6_HBH_OPTION]) (u32 flow_id,
						  ip6_hop_by_hop_option_t *
						  opt, u16 len);

  /** This contains the aggregated data from the time VPP started analysing. */
  ioam_analyser_data_t *aggregated_data;

} ip6_ioam_analyser_main_t;

extern ip6_ioam_analyser_main_t ioam_analyser_main;

extern vlib_node_registration_t analyse_node_local;
extern vlib_node_registration_t analyse_node_remote;

void ip6_ioam_analyse_register_handlers (void);

void ip6_ioam_analyse_unregister_handlers (void);

clib_error_t *ip6_ioam_analyse_init (vlib_main_t * vm);

inline static ioam_analyser_data_t *
ioam_analyse_get_data_from_flow_id (u32 flow_id)
{
  if (flow_id >= vec_len (ioam_analyser_main.aggregated_data))
    return NULL;

  if (ioam_analyser_main.aggregated_data[flow_id].is_free)
    ioam_analyser_main.aggregated_data[flow_id].is_free = 0;

  return (ioam_analyser_main.aggregated_data + flow_id);
}

always_inline void *
ip6_ioam_find_hbh_option (ip6_hop_by_hop_header_t * hbh0, u8 option)
{
  ip6_hop_by_hop_option_t *opt0, *limit0;
  u8 type0;

  opt0 = (ip6_hop_by_hop_option_t *) (hbh0 + 1);
  limit0 =
    (ip6_hop_by_hop_option_t *) ((u8 *) hbh0 + ((hbh0->length + 1) << 3));

  while (opt0 < limit0)
    {
      type0 = opt0->type;
      if (type0 == option)
	return ((void *) opt0);

      if (0 == type0)
	{
	  opt0 = (ip6_hop_by_hop_option_t *) ((u8 *) opt0) + 1;
	  continue;
	}
      opt0 = (ip6_hop_by_hop_option_t *)
	(((u8 *) opt0) + opt0->length + sizeof (ip6_hop_by_hop_option_t));
    }

  return NULL;
}

always_inline int
ip6_ioam_analyse_compare_path_delay (ip6_hop_by_hop_header_t * hbh0,
				     ip6_hop_by_hop_header_t * hbh1,
				     bool oneway)
{
  ioam_trace_option_t *trace0 = NULL, *trace1 = NULL;
  f64 delay0, delay1;

  trace0 =
    ip6_ioam_find_hbh_option (hbh0, HBH_OPTION_TYPE_IOAM_TRACE_DATA_LIST);
  trace1 =
    ip6_ioam_find_hbh_option (hbh1, HBH_OPTION_TYPE_IOAM_TRACE_DATA_LIST);

  if (PREDICT_FALSE ((trace0 == NULL) && (trace1 == NULL)))
    return 0;

  if (PREDICT_FALSE (trace1 == NULL))
    return 1;

  if (PREDICT_FALSE (trace0 == NULL))
    return -1;

  delay0 = ip6_ioam_analyse_calc_delay (&trace0->trace_hdr,
					trace0->hdr.length - 2, oneway);
  delay1 = ip6_ioam_analyse_calc_delay (&trace1->trace_hdr,
					trace1->hdr.length - 2, oneway);

  return (delay0 - delay1);
}

#endif /* PLUGINS_IOAM_PLUGIN_IOAM_ANALYSE_IP6_IOAM_ANALYSE_NODE_H_ */

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