/*

 * zebra affinity-map.

 *

 * Copyright 2022 6WIND S.A.

 *

 * This file is part of Free Range Routing (FRR).

 *

 * FRR is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by the

 * Free Software Foundation; either version 2, or (at your option) any

 * later version.

 *

 * FRR is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; see the file COPYING; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include <zebra.h>

#include "lib/if.h"

#include "lib/vrf.h"

#include "zebra/redistribute.h"

#include "zebra/zebra_affinitymap.h"

static bool zebra_affinity_map_check_use(const char *affmap_name)

{

  char xpath[XPATH_MAXLEN];

  struct interface *ifp;

  struct vrf *vrf;

  RB_FOREACH (vrf, vrf_id_head, &vrfs_by_id) {

    FOR_ALL_INTERFACES (vrf, ifp) {

      snprintf(xpath, sizeof(xpath),

         "/frr-interface:lib/interface[name='%s']",

         ifp->name);

      if (!yang_dnode_exists(running_config->dnode, xpath))

        continue;

      snprintf(

        xpath, sizeof(xpath),

        "/frr-interface:lib/interface[name='%s']/frr-zebra:zebra/link-params/affinities[affinity='%s']",

        ifp->name, affmap_name);

      if (yang_dnode_exists(running_config->dnode, xpath))

        return true;

    }

  }

  return false;

}

static bool zebra_affinity_map_check_update(const char *affmap_name,

              uint16_t new_pos)

{

  char xpath[XPATH_MAXLEN];

  struct interface *ifp;

  struct vrf *vrf;

  /* check whether the affinity-map new bit position is upper than 31

   * but is used on an interface on which affinity-mode is standard.

   * Return false if the change is not possible.

   */

  if (new_pos < 32)

    return true;

  RB_FOREACH (vrf, vrf_id_head, &vrfs_by_id) {

    FOR_ALL_INTERFACES (vrf, ifp) {

      snprintf(xpath, sizeof(xpath),

         "/frr-interface:lib/interface[name='%s']",

         ifp->name);

      if (!yang_dnode_exists(running_config->dnode, xpath))

        continue;

      snprintf(

        xpath, sizeof(xpath),

        "/frr-interface:lib/interface[name='%s']/frr-zebra:zebra/link-params/affinities[affinity='%s']",

        ifp->name, affmap_name);

      if (!yang_dnode_exists(running_config->dnode, xpath))

        continue;

      if (yang_dnode_get_enum(

            running_config->dnode,

            "/frr-interface:lib/interface[name='%s']/frr-zebra:zebra/link-params/affinity-mode",

            ifp->name) == AFFINITY_MODE_STANDARD)

        return false;

    }

  }

  return true;

}

static void zebra_affinity_map_update(const char *affmap_name, uint16_t old_pos,

              uint16_t new_pos)

{

  struct if_link_params *iflp;

  enum affinity_mode aff_mode;

  char xpath[XPATH_MAXLEN];

  struct interface *ifp;

  struct vrf *vrf;

  RB_FOREACH (vrf, vrf_id_head, &vrfs_by_id) {

    FOR_ALL_INTERFACES (vrf, ifp) {

      snprintf(xpath, sizeof(xpath),

         "/frr-interface:lib/interface[name='%s']",

         ifp->name);

      if (!yang_dnode_exists(running_config->dnode, xpath))

        continue;

      snprintf(

        xpath, sizeof(xpath),

        "/frr-interface:lib/interface[name='%s']/frr-zebra:zebra/link-params/affinities[affinity='%s']",

        ifp->name, affmap_name);

      if (!yang_dnode_exists(running_config->dnode, xpath))

        continue;

      aff_mode = yang_dnode_get_enum(

        running_config->dnode,

        "/frr-interface:lib/interface[name='%s']/frr-zebra:zebra/link-params/affinity-mode",

        ifp->name);

      iflp = if_link_params_get(ifp);

      if (aff_mode == AFFINITY_MODE_EXTENDED ||

          aff_mode == AFFINITY_MODE_BOTH) {

        admin_group_unset(&iflp->ext_admin_grp,

              old_pos);

        admin_group_set(&iflp->ext_admin_grp, new_pos);

      }

      if (aff_mode == AFFINITY_MODE_STANDARD ||

          aff_mode == AFFINITY_MODE_BOTH) {

        iflp->admin_grp &= ~(1 << old_pos);

        if (new_pos < 32)

          iflp->admin_grp |= 1 << new_pos;

        if (iflp->admin_grp == 0)

          UNSET_PARAM(iflp, LP_ADM_GRP);

      }

      if (if_is_operative(ifp))

        zebra_interface_parameters_update(ifp);

    }

  }

}

void zebra_affinity_map_init(void)

{

  affinity_map_init();

  affinity_map_set_check_use_hook(zebra_affinity_map_check_use);

  affinity_map_set_check_update_hook(zebra_affinity_map_check_update);

  affinity_map_set_update_hook(zebra_affinity_map_update);

}