qos_record.c

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/*
 * 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/qos/qos_record.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip6_to_ip4.h>
#include <vnet/feature/feature.h>
#include <vnet/qos/qos_types.h>
#include <vnet/l2/l2_input.h>
#include <vnet/l2/feat_bitmap.h>

/**
 * Per-interface, per-protocol vector of feature on/off configurations
 */
u8 *qos_record_configs[QOS_N_SOURCES];
u32 l2_qos_input_next[QOS_N_SOURCES][32];

static void
qos_record_feature_config (u32 sw_if_index,
                           qos_source_t input_source, u8 enable)
{
  switch (input_source)
    {
    case QOS_SOURCE_IP:
      vnet_feature_enable_disable ("ip6-unicast", "ip6-qos-record",
                                   sw_if_index, enable, NULL, 0);
      vnet_feature_enable_disable ("ip6-multicast", "ip6-qos-record",
                                   sw_if_index, enable, NULL, 0);
      vnet_feature_enable_disable ("ip4-unicast", "ip4-qos-record",
                                   sw_if_index, enable, NULL, 0);
      vnet_feature_enable_disable ("ip4-multicast", "ip4-qos-record",
                                   sw_if_index, enable, NULL, 0);
      l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_L2_IP_QOS_RECORD,
                                  enable);
      break;
    case QOS_SOURCE_MPLS:
      vnet_feature_enable_disable ("mpls-input", "mpls-qos-record",
                                   sw_if_index, enable, NULL, 0);
      break;
    case QOS_SOURCE_VLAN:
      vnet_feature_enable_disable ("ip6-unicast", "vlan-ip6-qos-record",
                                   sw_if_index, enable, NULL, 0);
      vnet_feature_enable_disable ("ip6-multicast", "vlan-ip6-qos-record",
                                   sw_if_index, enable, NULL, 0);
      vnet_feature_enable_disable ("ip4-unicast", "vlan-ip4-qos-record",
                                   sw_if_index, enable, NULL, 0);
      vnet_feature_enable_disable ("ip4-multicast", "vlan-ip4-qos-record",
                                   sw_if_index, enable, NULL, 0);
      vnet_feature_enable_disable ("mpls-input", "vlan-mpls-qos-record",
                                   sw_if_index, enable, NULL, 0);
      break;
    case QOS_SOURCE_EXT:
      /* not a valid option for recording */
      break;
    }
}

int
qos_record_enable (u32 sw_if_index, qos_source_t input_source)
{
  vec_validate (qos_record_configs[input_source], sw_if_index);

  if (0 == qos_record_configs[input_source][sw_if_index])
    {
      qos_record_feature_config (sw_if_index, input_source, 1);
    }

  qos_record_configs[input_source][sw_if_index]++;
  return (0);
}

int
qos_record_disable (u32 sw_if_index, qos_source_t input_source)
{
  if (vec_len (qos_record_configs[input_source]) <= sw_if_index)
    return VNET_API_ERROR_NO_MATCHING_INTERFACE;

  if (0 == qos_record_configs[input_source][sw_if_index])
    return VNET_API_ERROR_VALUE_EXIST;

  qos_record_configs[input_source][sw_if_index]--;

  if (0 == qos_record_configs[input_source][sw_if_index])
    {
      qos_record_feature_config (sw_if_index, input_source, 0);
    }

  return (0);
}

/*
 * Disable recording feature for all protocols when the interface
 * is deleted
 */
static clib_error_t *
qos_record_ip_interface_add_del (vnet_main_t * vnm,
                                 u32 sw_if_index, u32 is_add)
{
  if (!is_add)
    {
      qos_source_t qs;

      FOR_EACH_QOS_SOURCE (qs)
      {
        while (qos_record_disable (sw_if_index, qs) == 0);
      }
    }

  return (NULL);
}

VNET_SW_INTERFACE_ADD_DEL_FUNCTION (qos_record_ip_interface_add_del);

clib_error_t *
l2_ip_qos_init (vlib_main_t * vm)
{
  qos_source_t qs;
  vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "l2-ip-qos-record");

  /* Initialize the feature next-node indexes */
  FOR_EACH_QOS_SOURCE (qs)
    feat_bitmap_init_next_nodes (vm,
                                 node->index,
                                 L2INPUT_N_FEAT,
                                 l2input_get_feat_names (),
                                 l2_qos_input_next[qs]);
  return 0;
}

VLIB_INIT_FUNCTION (l2_ip_qos_init);

static clib_error_t *
qos_record_cli (vlib_main_t * vm,
                unformat_input_t * input, vlib_cli_command_t * cmd)
{
  vnet_main_t *vnm = vnet_get_main ();
  u32 sw_if_index, qs;
  u8 enable;

  qs = 0xff;
  enable = 1;
  sw_if_index = ~0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "%U", unformat_vnet_sw_interface,
                    vnm, &sw_if_index))
        ;
      else if (unformat (input, "%U", unformat_qos_source, &qs))
        ;
      else if (unformat (input, "enable"))
        enable = 1;
      else if (unformat (input, "disable"))
        enable = 0;
      else
        break;
    }

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

  if (enable)
    qos_record_enable (sw_if_index, qs);
  else
    qos_record_disable (sw_if_index, qs);

  return (NULL);
}

/*?
 * Enable QoS bit recording on an interface using the packet's input DSCP bits
 * Which input QoS bits to use are either; IP, MPLS or VLAN. If more than
 * one protocol is chosen (which is foolish) the higher layers override the
 * lower.
 *
 * @cliexpar
 * @cliexcmd{qos record ip GigEthernet0/1/0}
 ?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (qos_record_command, static) = {
  .path = "qos record",
  .short_help = "qos record <record-source> <INTERFACE> [disable]",
  .function = qos_record_cli,
  .is_mp_safe = 1,
};
/* *INDENT-ON* */


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