/*
 * Copyright (c) 2018 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.
 */

#include <vnet/ip/ip.h>
#include <vnet/feature/feature.h>
#include <vnet/qos/qos_egress_map.h>
#include <vnet/qos/qos_mark.h>

/**
 * per-interface vector of which MAP is used by which interface
 * for each output source
 */
index_t *qos_mark_configs[QOS_N_SOURCES];

void
qos_mark_ip_enable_disable (u32 sw_if_index, u8 enable)
{
  vnet_feature_enable_disable ("ip6-output", "ip6-qos-mark",
			       sw_if_index, enable, NULL, 0);
  vnet_feature_enable_disable ("ip4-output", "ip4-qos-mark",
			       sw_if_index, enable, NULL, 0);
}

void
qos_mark_vlan_enable_disable (u32 sw_if_index, u8 enable)
{
  /*
   * one cannot run a feature on a sub-interface, so we need
   * to enable a feature on all the L3 output paths
   */
  vnet_feature_enable_disable ("ip6-output", "vlan-ip6-qos-mark",
			       sw_if_index, enable, NULL, 0);
  vnet_feature_enable_disable ("ip4-output", "vlan-ip4-qos-mark",
			       sw_if_index, enable, NULL, 0);
  vnet_feature_enable_disable ("mpls-output", "vlan-mpls-qos-mark",
			       sw_if_index, enable, NULL, 0);
}

void
qos_mark_mpls_enable_disable (u32 sw_if_index, u8 enable)
{
  vnet_feature_enable_disable ("mpls-output", "mpls-qos-mark",
			       sw_if_index, enable, NULL, 0);
}

static void
qos_egress_map_feature_config (u32 sw_if_index, qos_source_t qs, u8 enable)
{
  switch (qs)
    {
    case QOS_SOURCE_EXT:
      ASSERT (0);
      break;
    case QOS_SOURCE_VLAN:
      qos_mark_vlan_enable_disable (sw_if_index, enable);
      break;
    case QOS_SOURCE_MPLS:
      qos_mark_mpls_enable_disable (sw_if_index, enable);
      break;
    case QOS_SOURCE_IP:
      qos_mark_ip_enable_disable (sw_if_index, enable);
      break;
    }
}

int
qos_mark_enable (u32 sw_if_index,
		 qos_source_t output_source, qos_egress_map_id_t mid)
{
  index_t qemi;

  vec_validate_init_empty (qos_mark_configs[output_source],
			   sw_if_index, INDEX_INVALID);

  qemi = qos_egress_map_find (mid);

  if (INDEX_INVALID == qemi)
    return VNET_API_ERROR_NO_SUCH_TABLE;

  if (INDEX_INVALID == qos_mark_configs[output_source][sw_if_index])
    {
      qos_egress_map_feature_config (sw_if_index, output_source, 1);
    }

  qos_mark_configs[output_source][sw_if_index] = qemi;

  return (0);
}

int
qos_mark_disable (u32 sw_if_index, qos_source_t output_source)
{
  if (vec_len (qos_mark_configs[output_source]) <= sw_if_index)
    return VNET_API_ERROR_NO_MATCHING_INTERFACE;
  if (INDEX_INVALID == qos_mark_configs[output_source][sw_if_index])
    return VNET_API_ERROR_VALUE_EXIST;

  if (INDEX_INVALID != qos_mark_configs[output_source][sw_if_index])
    {
      qos_egress_map_feature_config (sw_if_index, output_source, 0);
    }

  qos_mark_configs[output_source][sw_if_index] = INDEX_INVALID;

  return (0);
}

static clib_error_t *
qos_mark_cli (vlib_main_t * vm,
	      unformat_input_t * input, vlib_cli_command_t * cmd)
{
  qos_egress_map_id_t map_id;
  u32 sw_if_index, qs;
  vnet_main_t *vnm;
  int rv, enable;

  vnm = vnet_get_main ();
  map_id = ~0;
  qs = 0xff;
  enable = 1;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "id %d", &map_id))
	;
      else if (unformat (input, "disable"))
	enable = 0;
      else if (unformat (input, "%U", unformat_qos_source, &qs))
	;
      else if (unformat (input, "%U",
			 unformat_vnet_sw_interface, vnm, &sw_if_index))
	;
      else
	break;
    }

  if (~0 == sw_if_index)
    return clib_error_return (0, "interface must be specified");
  if (0xff == qs)
    return clib_error_return (0, "output location must be specified");

  if (enable)
    rv = qos_mark_enable (sw_if_index, qs, map_id);
  else
    rv = qos_mark_disable (sw_if_index, qs);

  if (0 == rv)
    return (NULL);

  return clib_error_return (0, "Failed to map interface");
}

/*?
 * Apply a QoS egress mapping table to an interface for QoS marking packets
 * at the given output protocol.
 *
 * @cliexpar
 * @cliexcmd{qos egress interface GigEthernet0/9/0 id 0 output ip}
 ?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (qos_egress_map_interface_command, static) = {
  .path = "qos mark",
  .short_help = "qos mark <SOURCE> <INTERFACE> id <MAP>",
  .function = qos_mark_cli,
  .is_mp_safe = 1,
};
/* *INDENT-ON* */

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