/*
 *------------------------------------------------------------------
 * 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.
 *------------------------------------------------------------------
 */

#include <stdint.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/bonding/node.h>
#include <vpp/stats/stat_segment.h>

void
bond_disable_collecting_distributing (vlib_main_t * vm, member_if_t * mif)
{
  bond_main_t *bm = &bond_main;
  bond_if_t *bif;
  int i;
  uword p;
  u8 switching_active = 0;

  bif = bond_get_bond_if_by_dev_instance (mif->bif_dev_instance);
  clib_spinlock_lock_if_init (&bif->lockp);
  vec_foreach_index (i, bif->active_members)
  {
    p = *vec_elt_at_index (bif->active_members, i);
    if (p == mif->sw_if_index)
      {
	if ((bif->mode == BOND_MODE_ACTIVE_BACKUP) && (i == 0) &&
	    (vec_len (bif->active_members) > 1))
	  /* deleting the active member for active-backup */
	  switching_active = 1;
	vec_del1 (bif->active_members, i);
	if (mif->lacp_enabled && bif->numa_only)
	  {
	    /* For lacp mode, if we check it is a member on local numa node,
	       bif->n_numa_members should be decreased by 1 becasue the first
	       bif->n_numa_members are all members on local numa node */
	    if (i < bif->n_numa_members)
	      {
		bif->n_numa_members--;
		ASSERT (bif->n_numa_members >= 0);
	      }
	  }
	break;
      }
  }

  /* We get a new member just becoming active */
  if (switching_active)
    vlib_process_signal_event (bm->vlib_main, bond_process_node.index,
			       BOND_SEND_GARP_NA, bif->hw_if_index);
  clib_spinlock_unlock_if_init (&bif->lockp);
}

/*
 * return 1 if s2 is preferred.
 * return -1 if s1 is preferred.
 */
static int
bond_member_sort (void *a1, void *a2)
{
  u32 *s1 = a1;
  u32 *s2 = a2;
  member_if_t *mif1 = bond_get_member_by_sw_if_index (*s1);
  member_if_t *mif2 = bond_get_member_by_sw_if_index (*s2);
  bond_if_t *bif;

  ALWAYS_ASSERT (mif1);
  ALWAYS_ASSERT (mif2);
  /*
   * sort entries according to preference rules:
   * 1. biggest weight
   * 2. numa-node
   * 3. current active member (to prevent churning)
   * 4. lowest sw_if_index (for deterministic behavior)
   *
   */
  if (mif2->weight > mif1->weight)
    return 1;
  if (mif2->weight < mif1->weight)
    return -1;
  else
    {
      if (mif2->is_local_numa > mif1->is_local_numa)
	return 1;
      if (mif2->is_local_numa < mif1->is_local_numa)
	return -1;
      else
	{
	  bif = bond_get_bond_if_by_dev_instance (mif1->bif_dev_instance);
	  /* Favor the current active member to avoid churning */
	  if (bif->active_members[0] == mif2->sw_if_index)
	    return 1;
	  if (bif->active_members[0] == mif1->sw_if_index)
	    return -1;
	  /* go for the tiebreaker as the last resort */
	  if (mif1->sw_if_index > mif2->sw_if_index)
	    return 1;
	  if (mif1->sw_if_index < mif2->sw_if_index)
	    return -1;
	  else
	    ASSERT (0);
	}
    }
  return 0;
}

static void
bond_sort_members (bond_if_t * bif)
{
  bond_main_t *bm = &bond_main;
  u32 old_active = bif->active_members[0];

  vec_sort_with_function (bif->active_members, bond_member_sort);
  if (old_active != bif->active_members[0])
    vlib_process_signal_event (bm->vlib_main, bond_process_node.index,
			       BOND_SEND_GARP_NA, bif->hw_if_index);
}

void
bond_enable_collecting_distributing (vlib_main_t * vm, member_if_t * mif)
{
  bond_if_t *bif;
  bond_main_t *bm = &bond_main;
  vnet_main_t *vnm = vnet_get_main ();
  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, mif->sw_if_index);
  int i;
  uword p;

  bif = bond_get_bond_if_by_dev_instance (mif->bif_dev_instance);
  clib_spinlock_lock_if_init (&bif->lockp);
  vec_foreach_index (i, bif->active_members)
  {
    p = *vec_elt_at_index (bif->active_members, i);
    if (p == mif->sw_if_index)
      goto done;
  }

  if (mif->lacp_enabled && bif->numa_only && (vm->numa_node == hw->numa_node))
    {
      vec_insert_elts (bif->active_members, &mif->sw_if_index, 1,
		       bif->n_numa_members);
      bif->n_numa_members++;
    }
  else
    vec_add1 (bif->active_members, mif->sw_if_index);

  mif->is_local_numa = (vm->numa_node == hw->numa_node) ? 1 : 0;
  if (bif->mode == BOND_MODE_ACTIVE_BACKUP)
    {
      if (vec_len (bif->active_members) == 1)
	/* First member becomes active? */
	vlib_process_signal_event (bm->vlib_main, bond_process_node.index,
				   BOND_SEND_GARP_NA, bif->hw_if_index);
      else
	bond_sort_members (bif);
    }

done:
  clib_spinlock_unlock_if_init (&bif->lockp);
}

int
bond_dump_ifs (bond_interface_details_t ** out_bondifs)
{
  vnet_main_t *vnm = vnet_get_main ();
  bond_main_t *bm = &bond_main;
  bond_if_t *bif;
  vnet_hw_interface_t *hi;
  bond_interface_details_t *r_bondifs = NULL;
  bond_interface_details_t *bondif = NULL;

  /* *INDENT-OFF* */
  pool_foreach (bif, bm->interfaces,
    vec_add2(r_bondifs, bondif, 1);
    clib_memset (bondif, 0, sizeof (*bondif));
    bondif->id = bif->id;
    bondif->sw_if_index = bif->sw_if_index;
    hi = vnet_get_hw_interface (vnm, bif->hw_if_index);
    clib_memcpy(bondif->interface_name, hi->name,
                MIN (ARRAY_LEN (bondif->interface_name) - 1,
                     vec_len ((const char *) hi->name)));
    /* enforce by memset() above */
    ASSERT(0 == bondif->interface_name[ARRAY_LEN (bondif->interface_name) - 1]);
    bondif->mode = bif->mode;
    bondif->lb = bif->lb;
    bondif->numa_only = bif->numa_only;
    bondif->active_members = vec_len (bif->active_members);
    bondif->members = vec_len (bif->members);
  );
  /* *INDENT-ON* */

  *out_bondifs = r_bondifs;

  return 0;
}

int
bond_dump_member_ifs (member_interface_details_t ** out_memberifs,
		      u32 bond_sw_if_index)
{
  vnet_main_t *vnm = vnet_get_main ();
  bond_if_t *bif;
  vnet_hw_interface_t *hi;
  vnet_sw_interface_t *sw;
  member_interface_details_t *r_memberifs = NULL;
  member_interface_details_t *memberif = NULL;
  u32 *sw_if_index = NULL;
  member_if_t *mif;

  bif = bond_get_bond_if_by_sw_if_index (bond_sw_if_index);
  if (!bif)
    return 1;

  vec_foreach (sw_if_index, bif->members)
  {
    vec_add2 (r_memberifs, memberif, 1);
    clib_memset (memberif, 0, sizeof (*memberif));
    mif = bond_get_member_by_sw_if_index (*sw_if_index);
    if (mif)
      {
	sw = vnet_get_sw_interface (vnm, mif->sw_if_index);
	hi = vnet_get_hw_interface (vnm, sw->hw_if_index);
	clib_memcpy (memberif->interface_name, hi->name,
		     MIN (ARRAY_LEN (memberif->interface_name) - 1,
			  vec_len ((const char *) hi->name)));
	/* enforce by memset() above */
	ASSERT (0 ==
		memberif->interface_name[ARRAY_LEN (memberif->interface_name)
					 - 1]);
	memberif->sw_if_index = mif->sw_if_index;
	memberif->is_passive = mif->is_passive;
	memberif->is_long_timeout = mif->is_long_timeout;
	memberif->is_local_numa = mif->is_local_numa;
	memberif->weight = mif->weight;
      }
  }
  *out_memberifs = r_memberifs;

  return 0;
}

/*
 * Manage secondary mac addresses when attaching/detaching a member.
 * If adding, copy any secondary addresses from bond interface to member.
 * If deleting, delete the bond interface's secondary addresses from the
 * member.
 */
static void
bond_member_add_del_mac_addrs (bond_if_t * bif, u32 mif_sw_if_index,
			       u8 is_add)
{
  vnet_main_t *vnm = vnet_get_main ();
  ethernet_interface_t *b_ei;
  mac_address_t *sec_mac;
  vnet_hw_interface_t *s_hwif;

  b_ei = ethernet_get_interface (&ethernet_main, bif->hw_if_index);
  if (!b_ei || !b_ei->secondary_addrs)
    return;

  s_hwif = vnet_get_sup_hw_interface (vnm, mif_sw_if_index);

  vec_foreach (sec_mac, b_ei->secondary_addrs)
    vnet_hw_interface_add_del_mac_address (vnm, s_hwif->hw_if_index,
					   sec_mac->bytes, is_add);
}

static void
bond_delete_neighbor (vlib_main_t * vm, bond_if_t * bif, member_if_t * mif)
{
  bond_main_t *bm = &bond_main;
  vnet_main_t *vnm = vnet_get_main ();
  int i;
  vnet_hw_interface_t *mif_hw;

  mif_hw = vnet_get_sup_hw_interface (vnm, mif->sw_if_index);

  bif->port_number_bitmap =
    clib_bitmap_set (bif->port_number_bitmap,
		     ntohs (mif->actor_admin.port_number) - 1, 0);
  bm->member_by_sw_if_index[mif->sw_if_index] = 0;
  vec_free (mif->last_marker_pkt);
  vec_free (mif->last_rx_pkt);
  vec_foreach_index (i, bif->members)
  {
    uword p = *vec_elt_at_index (bif->members, i);
    if (p == mif->sw_if_index)
      {
	vec_del1 (bif->members, i);
	break;
      }
  }

  bond_disable_collecting_distributing (vm, mif);

  vnet_feature_enable_disable ("device-input", "bond-input",
			       mif->sw_if_index, 0, 0, 0);

  /* Put back the old mac */
  vnet_hw_interface_change_mac_address (vnm, mif_hw->hw_if_index,
					mif->persistent_hw_address);

  /* delete the bond's secondary/virtual mac addrs from the member */
  bond_member_add_del_mac_addrs (bif, mif->sw_if_index, 0 /* is_add */ );


  if ((bif->mode == BOND_MODE_LACP) && bm->lacp_enable_disable)
    (*bm->lacp_enable_disable) (vm, bif, mif, 0);

  if (bif->mode == BOND_MODE_LACP)
    {
      stat_segment_deregister_state_counter
	(bm->stats[bif->sw_if_index][mif->sw_if_index].actor_state);
      stat_segment_deregister_state_counter
	(bm->stats[bif->sw_if_index][mif->sw_if_index].partner_state);
    }

  pool_put (bm->neighbors, mif);
}

int
bond_delete_if (vlib_main_t * vm, u32 sw_if_index)
{
  bond_main_t *bm = &bond_main;
  vnet_main_t *vnm = vnet_get_main ();
  bond_if_t *bif;
  member_if_t *mif;
  vnet_hw_interface_t *hw;
  u32 *mif_sw_if_index;
  u32 *s_list = 0;

  hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
  if (hw == NULL || bond_dev_class.index != hw->dev_class_index)
    return VNET_API_ERROR_INVALID_SW_IF_INDEX;

  bif = bond_get_bond_if_by_dev_instance (hw->dev_instance);

  vec_append (s_list, bif->members);
  vec_foreach (mif_sw_if_index, s_list)
  {
    mif = bond_get_member_by_sw_if_index (*mif_sw_if_index);
    if (mif)
      bond_delete_neighbor (vm, bif, mif);
  }
  vec_free (s_list);

  /* bring down the interface */
  vnet_hw_interface_set_flags (vnm, bif->hw_if_index, 0);
  vnet_sw_interface_set_flags (vnm, bif->sw_if_index, 0);

  ethernet_delete_interface (vnm, bif->hw_if_index);

  clib_bitmap_free (bif->port_number_bitmap);
  hash_unset (bm->bond_by_sw_if_index, bif->sw_if_index);
  hash_unset (bm->id_used, bif->id);
  clib_memset (bif, 0, sizeof (*bif));
  pool_put (bm->interfaces, bif);

  return 0;
}

void
bond_create_if (vlib_main_t * vm, bond_create_if_args_t * args)
{
  bond_main_t *bm = &bond_main;
  vnet_main_t *vnm = vnet_get_main ();
  vnet_sw_interface_t *sw;
  bond_if_t *bif;
  vnet_hw_interface_t *hw;

  if ((args->mode == BOND_MODE_LACP) && bm->lacp_plugin_loaded == 0)
    {
      args->rv = VNET_API_ERROR_FEATURE_DISABLED;
      args->error = clib_error_return (0, "LACP plugin is not loaded");
      return;
    }
  if (args->mode > BOND_MODE_LACP || args->mode < BOND_MODE_ROUND_ROBIN)
    {
      args->rv = VNET_API_ERROR_INVALID_ARGUMENT;
      args->error = clib_error_return (0, "Invalid mode");
      return;
    }
  if (args->lb > BOND_LB_L23)
    {
      args->rv = VNET_API_ERROR_INVALID_ARGUMENT;
      args->error = clib_error_return (0, "Invalid load-balance");
      return;
    }
  pool_get (bm->interfaces, bif);
  clib_memset (bif, 0, sizeof (*bif));
  bif->dev_instance = bif - bm->interfaces;
  bif->id = args->id;
  bif->lb = args->lb;
  bif->mode = args->mode;
  bif->gso = args->gso;

  // Adjust requested interface id
  if (bif->id == ~0)
    bif->id = bif->dev_instance;
  if (hash_get (bm->id_used, bif->id))
    {
      args->rv = VNET_API_ERROR_INSTANCE_IN_USE;
      pool_put (bm->interfaces, bif);
      return;
    }
  hash_set (bm->id_used, bif->id, 1);

  // Special load-balance mode used for rr and bc
  if (bif->mode == BOND_MODE_ROUND_ROBIN)
    bif->lb = BOND_LB_RR;
  else if (bif->mode == BOND_MODE_BROADCAST)
    bif->lb = BOND_LB_BC;
  else if (bif->mode == BOND_MODE_ACTIVE_BACKUP)
    bif->lb = BOND_LB_AB;

  bif->use_custom_mac = args->hw_addr_set;
  if (!args->hw_addr_set)
    {
      f64 now = vlib_time_now (vm);
      u32 rnd;
      rnd = (u32) (now * 1e6);
      rnd = random_u32 (&rnd);

      memcpy (args->hw_addr + 2, &rnd, sizeof (rnd));
      args->hw_addr[0] = 2;
      args->hw_addr[1] = 0xfe;
    }
  memcpy (bif->hw_address, args->hw_addr, 6);
  args->error = ethernet_register_interface
    (vnm, bond_dev_class.index, bif->dev_instance /* device instance */ ,
     bif->hw_address /* ethernet address */ ,
     &bif->hw_if_index, 0 /* flag change */ );

  if (args->error)
    {
      args->rv = VNET_API_ERROR_INVALID_REGISTRATION;
      hash_unset (bm->id_used, bif->id);
      pool_put (bm->interfaces, bif);
      return;
    }

  sw = vnet_get_hw_sw_interface (vnm, bif->hw_if_index);
  bif->sw_if_index = sw->sw_if_index;
  bif->group = bif->sw_if_index;
  bif->numa_only = args->numa_only;

  hw = vnet_get_hw_interface (vnm, bif->hw_if_index);
  /*
   * Add GSO and Checksum offload flags if GSO is enabled on Bond
   */
  if (args->gso)
    {
      hw->flags |= (VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO |
		    VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD);
    }
  if (vlib_get_thread_main ()->n_vlib_mains > 1)
    clib_spinlock_init (&bif->lockp);

  vnet_hw_interface_set_flags (vnm, bif->hw_if_index,
			       VNET_HW_INTERFACE_FLAG_LINK_UP);

  hash_set (bm->bond_by_sw_if_index, bif->sw_if_index, bif->dev_instance);

  // for return
  args->sw_if_index = bif->sw_if_index;
  args->rv = 0;
}

static clib_error_t *
bond_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
			vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  bond_create_if_args_t args = { 0 };
  u8 mode_is_set = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return clib_error_return (0, "Missing required arguments.");

  args.id = ~0;
  args.mode = -1;
  args.lb = BOND_LB_L2;
  args.rv = -1;
  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "mode %U", unformat_bond_mode, &args.mode))
	mode_is_set = 1;
      else if (((args.mode == BOND_MODE_LACP) || (args.mode == BOND_MODE_XOR))
	       && unformat (line_input, "load-balance %U",
			    unformat_bond_load_balance, &args.lb))
	;
      else if (unformat (line_input, "hw-addr %U",
			 unformat_ethernet_address, args.hw_addr))
	args.hw_addr_set = 1;
      else if (unformat (line_input, "id %u", &args.id))
	;
      else if (unformat (line_input, "gso"))
	args.gso = 1;
      else if (unformat (line_input, "numa-only"))
	{
	  if (args.mode == BOND_MODE_LACP)
	    args.numa_only = 1;
	  else
	    return clib_error_return (0,
				      "Only lacp mode supports numa-only so far!");
	}
      else
	return clib_error_return (0, "unknown input `%U'",
				  format_unformat_error, input);
    }
  unformat_free (line_input);

  if (mode_is_set == 0)
    return clib_error_return (0, "Missing bond mode");

  bond_create_if (vm, &args);

  if (!args.rv)
    vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name,
		     vnet_get_main (), args.sw_if_index);

  return args.error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (bond_create_command, static) = {
  .path = "create bond",
  .short_help = "create bond mode {round-robin | active-backup | broadcast | "
    "{lacp | xor} [load-balance { l2 | l23 | l34 } [numa-only]]} "
    "[hw-addr <mac-address>] [id <if-id>] [gso]",
  .function = bond_create_command_fn,
};
/* *INDENT-ON* */

static clib_error_t *
bond_delete_command_fn (vlib_main_t * vm, unformat_input_t * input,
			vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  u32 sw_if_index = ~0;
  vnet_main_t *vnm = vnet_get_main ();
  int rv;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return clib_error_return (0, "Missing <interface>");

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "sw_if_index %d", &sw_if_index))
	;
      else if (unformat (line_input, "%U", unformat_vnet_sw_interface,
			 vnm, &sw_if_index))
	;
      else
	return clib_error_return (0, "unknown input `%U'",
				  format_unformat_error, input);
    }
  unformat_free (line_input);

  if (sw_if_index == ~0)
    return clib_error_return (0,
			      "please specify interface name or sw_if_index");

  rv = bond_delete_if (vm, sw_if_index);
  if (rv == VNET_API_ERROR_INVALID_SW_IF_INDEX)
    return clib_error_return (0, "not a bond interface");
  else if (rv != 0)
    return clib_error_return (0, "error on deleting bond interface");

  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (bond_delete__command, static) =
{
  .path = "delete bond",
  .short_help = "delete bond {<interface> | sw_if_index <sw_idx>}",
  .function = bond_delete_command_fn,
};
/* *INDENT-ON* */

void
bond_add_member (vlib_main_t * vm, bond_add_member_args_t * args)
{
  bond_main_t *bm = &bond_main;
  vnet_main_t *vnm = vnet_get_main ();
  bond_if_t *bif;
  member_if_t *mif;
  vnet_interface_main_t *im = &vnm->interface_main;
  vnet_hw_interface_t *bif_hw, *mif_hw;
  vnet_sw_interface_t *sw;
  u32 thread_index;
  u32 mif_if_index;

  bif = bond_get_bond_if_by_sw_if_index (args->group);
  if (!bif)
    {
      args->rv = VNET_API_ERROR_INVALID_INTERFACE;
      args->error = clib_error_return (0, "bond interface not found");
      return;
    }
  // make sure the interface is not already added as member
  if (bond_get_member_by_sw_if_index (args->member))
    {
      args->rv = VNET_API_ERROR_VALUE_EXIST;
      args->error = clib_error_return
	(0, "interface was already added as member");
      return;
    }
  mif_hw = vnet_get_sup_hw_interface (vnm, args->member);
  if (mif_hw->dev_class_index == bond_dev_class.index)
    {
      args->rv = VNET_API_ERROR_INVALID_INTERFACE;
      args->error =
	clib_error_return (0, "bond interface cannot be added as member");
      return;
    }
  if (bif->gso && !(mif_hw->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO))
    {
      args->rv = VNET_API_ERROR_INVALID_INTERFACE;
      args->error =
	clib_error_return (0, "member interface is not gso capable");
      return;
    }
  if (bif->mode == BOND_MODE_LACP)
    {
      u8 *name = format (0, "/if/lacp/%u/%u/state%c", bif->sw_if_index,
			 args->member, 0);

      vec_validate (bm->stats, bif->sw_if_index);
      vec_validate (bm->stats[bif->sw_if_index], args->member);

      args->error = stat_segment_register_state_counter
	(name, &bm->stats[bif->sw_if_index][args->member].actor_state);
      if (args->error != 0)
	{
	  args->rv = VNET_API_ERROR_INVALID_INTERFACE;
	  vec_free (name);
	  return;
	}

      vec_reset_length (name);
      name = format (0, "/if/lacp/%u/%u/partner-state%c", bif->sw_if_index,
		     args->member, 0);
      args->error = stat_segment_register_state_counter
	(name, &bm->stats[bif->sw_if_index][args->member].partner_state);
      vec_free (name);
      if (args->error != 0)
	{
	  args->rv = VNET_API_ERROR_INVALID_INTERFACE;
	  return;
	}
    }

  pool_get (bm->neighbors, mif);
  clib_memset (mif, 0, sizeof (*mif));
  sw = pool_elt_at_index (im->sw_interfaces, args->member);
  /* port_enabled is both admin up and hw link up */
  mif->port_enabled = vnet_sw_interface_is_up (vnm, sw->sw_if_index);
  mif->sw_if_index = sw->sw_if_index;
  mif->hw_if_index = sw->hw_if_index;
  mif->packet_template_index = (u8) ~ 0;
  mif->is_passive = args->is_passive;
  mif->group = args->group;
  mif->bif_dev_instance = bif->dev_instance;
  mif->mode = bif->mode;

  mif->is_long_timeout = args->is_long_timeout;
  if (args->is_long_timeout)
    mif->ttl_in_seconds = LACP_LONG_TIMOUT_TIME;
  else
    mif->ttl_in_seconds = LACP_SHORT_TIMOUT_TIME;

  vec_validate_aligned (bm->member_by_sw_if_index, mif->sw_if_index,
			CLIB_CACHE_LINE_BYTES);
  /*
   * mif - bm->neighbors may be 0
   * Left shift it by 1 bit to distinguish the valid entry that we actually
   * store from the null entries
   */
  bm->member_by_sw_if_index[mif->sw_if_index] =
    (uword) (((mif - bm->neighbors) << 1) | 1);
  vec_add1 (bif->members, mif->sw_if_index);

  mif_hw = vnet_get_sup_hw_interface (vnm, mif->sw_if_index);

  /* Save the old mac */
  memcpy (mif->persistent_hw_address, mif_hw->hw_address, 6);
  bif_hw = vnet_get_sup_hw_interface (vnm, bif->sw_if_index);
  if (bif->use_custom_mac)
    {
      vnet_hw_interface_change_mac_address (vnm, mif_hw->hw_if_index,
					    bif->hw_address);
    }
  else
    {
      // bond interface gets the mac address from the first member
      if (vec_len (bif->members) == 1)
	{
	  memcpy (bif->hw_address, mif_hw->hw_address, 6);
	  vnet_hw_interface_change_mac_address (vnm, bif_hw->hw_if_index,
						mif_hw->hw_address);
	}
      else
	{
	  // subsequent members gets the mac address of the bond interface
	  vnet_hw_interface_change_mac_address (vnm, mif_hw->hw_if_index,
						bif->hw_address);
	}
    }

  /* if there are secondary/virtual mac addrs, propagate to the member */
  bond_member_add_del_mac_addrs (bif, mif->sw_if_index, 1 /* is_add */ );

  if (bif_hw->l2_if_count)
    ethernet_set_flags (vnm, mif_hw->hw_if_index,
			ETHERNET_INTERFACE_FLAG_ACCEPT_ALL);
  else
    ethernet_set_flags (vnm, mif_hw->hw_if_index,
			/*ETHERNET_INTERFACE_FLAG_DEFAULT_L3 */ 0);

  if (bif->mode == BOND_MODE_LACP)
    {
      if (bm->lacp_enable_disable)
	(*bm->lacp_enable_disable) (vm, bif, mif, 1);
    }
  else if (mif->port_enabled)
    {
      bond_enable_collecting_distributing (vm, mif);
    }

  vec_foreach_index (thread_index, bm->per_thread_data)
  {
    bond_per_thread_data_t *ptd = vec_elt_at_index (bm->per_thread_data,
						    thread_index);

    vec_validate_aligned (ptd->per_port_queue, vec_len (bif->members) - 1,
			  CLIB_CACHE_LINE_BYTES);

    vec_foreach_index (mif_if_index, ptd->per_port_queue)
    {
      ptd->per_port_queue[mif_if_index].n_buffers = 0;
    }
  }

  args->rv = vnet_feature_enable_disable ("device-input", "bond-input",
					  mif->sw_if_index, 1, 0, 0);

  if (args->rv)
    {
      args->error =
	clib_error_return (0,
			   "Error encountered on input feature arc enable");
    }
}

static clib_error_t *
add_member_interface_command_fn (vlib_main_t * vm, unformat_input_t * input,
				 vlib_cli_command_t * cmd)
{
  bond_add_member_args_t args = { 0 };
  unformat_input_t _line_input, *line_input = &_line_input;
  vnet_main_t *vnm = vnet_get_main ();

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return clib_error_return (0, "Missing required arguments.");

  args.member = ~0;
  args.group = ~0;
  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U %U",
		    unformat_vnet_sw_interface, vnm, &args.group,
		    unformat_vnet_sw_interface, vnm, &args.member))
	;
      else if (unformat (line_input, "passive"))
	args.is_passive = 1;
      else if (unformat (line_input, "long-timeout"))
	args.is_long_timeout = 1;
      else
	{
	  args.error = clib_error_return (0, "unknown input `%U'",
					  format_unformat_error, input);
	  break;
	}
    }
  unformat_free (line_input);

  if (args.error)
    return args.error;
  if (args.group == ~0)
    return clib_error_return (0, "Missing bond interface");
  if (args.member == ~0)
    return clib_error_return (0,
			      "please specify valid member interface name");

  bond_add_member (vm, &args);

  return args.error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (add_member_interface_command, static) = {
  .path = "bond add",
  .short_help = "bond add <BondEthernetx> <member-interface> "
                "[passive] [long-timeout]",
  .function = add_member_interface_command_fn,
};
/* *INDENT-ON* */

void
bond_detach_member (vlib_main_t * vm, bond_detach_member_args_t * args)
{
  bond_if_t *bif;
  member_if_t *mif;

  mif = bond_get_member_by_sw_if_index (args->member);
  if (!mif)
    {
      args->rv = VNET_API_ERROR_INVALID_INTERFACE;
      args->error = clib_error_return (0, "interface was not a member");
      return;
    }
  bif = bond_get_bond_if_by_dev_instance (mif->bif_dev_instance);
  bond_delete_neighbor (vm, bif, mif);
}

static clib_error_t *
detach_interface_command_fn (vlib_main_t * vm, unformat_input_t * input,
			     vlib_cli_command_t * cmd)
{
  bond_detach_member_args_t args = { 0 };
  unformat_input_t _line_input, *line_input = &_line_input;
  vnet_main_t *vnm = vnet_get_main ();

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return clib_error_return (0, "Missing required arguments.");

  args.member = ~0;
  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "%U",
		    unformat_vnet_sw_interface, vnm, &args.member))
	;
      else
	{
	  args.error = clib_error_return (0, "unknown input `%U'",
					  format_unformat_error, input);
	  break;
	}
    }
  unformat_free (line_input);

  if (args.error)
    return args.error;
  if (args.member == ~0)
    return clib_error_return (0,
			      "please specify valid member interface name");

  bond_detach_member (vm, &args);

  return args.error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (detach_interface_command, static) = {
  .path = "bond del",
  .short_help = "bond del <member-interface>",
  .function = detach_interface_command_fn,
};
/* *INDENT-ON* */

static void
show_bond (vlib_main_t * vm)
{
  bond_main_t *bm = &bond_main;
  bond_if_t *bif;

  vlib_cli_output (vm, "%-16s %-12s %-13s %-13s %-14s %s",
		   "interface name", "sw_if_index", "mode",
		   "load balance", "active members", "members");

  /* *INDENT-OFF* */
  pool_foreach (bif, bm->interfaces,
  ({
    vlib_cli_output (vm, "%-16U %-12d %-13U %-13U %-14u %u",
		     format_bond_interface_name, bif->dev_instance,
		     bif->sw_if_index, format_bond_mode, bif->mode,
		     format_bond_load_balance, bif->lb,
		     vec_len (bif->active_members), vec_len (bif->members));
  }));
  /* *INDENT-ON* */
}

static void
show_bond_details (vlib_main_t * vm)
{
  bond_main_t *bm = &bond_main;
  bond_if_t *bif;
  u32 *sw_if_index;

  /* *INDENT-OFF* */
  pool_foreach (bif, bm->interfaces,
  ({
    vlib_cli_output (vm, "%U", format_bond_interface_name, bif->dev_instance);
    vlib_cli_output (vm, "  mode: %U",
		     format_bond_mode, bif->mode);
    vlib_cli_output (vm, "  load balance: %U",
		     format_bond_load_balance, bif->lb);
    if (bif->gso)
      vlib_cli_output (vm, "  gso enable");
    if (bif->mode == BOND_MODE_ROUND_ROBIN)
      vlib_cli_output (vm, "  last xmit member index: %u",
		       bif->lb_rr_last_index);
    vlib_cli_output (vm, "  number of active members: %d",
		     vec_len (bif->active_members));
    vec_foreach (sw_if_index, bif->active_members)
      {
        vlib_cli_output (vm, "    %U", format_vnet_sw_if_index_name,
			 vnet_get_main (), *sw_if_index);
	if (bif->mode == BOND_MODE_ACTIVE_BACKUP)
	  {
	    member_if_t *mif = bond_get_member_by_sw_if_index (*sw_if_index);
	    if (mif)
	      vlib_cli_output (vm, "      weight: %u, is_local_numa: %u, "
			       "sw_if_index: %u", mif->weight,
			       mif->is_local_numa, mif->sw_if_index);
	  }
      }
    vlib_cli_output (vm, "  number of members: %d", vec_len (bif->members));
    vec_foreach (sw_if_index, bif->members)
      {
        vlib_cli_output (vm, "    %U", format_vnet_sw_if_index_name,
			 vnet_get_main (), *sw_if_index);
      }
    vlib_cli_output (vm, "  device instance: %d", bif->dev_instance);
    vlib_cli_output (vm, "  interface id: %d", bif->id);
    vlib_cli_output (vm, "  sw_if_index: %d", bif->sw_if_index);
    vlib_cli_output (vm, "  hw_if_index: %d", bif->hw_if_index);
  }));
  /* *INDENT-ON* */
}

static clib_error_t *
show_bond_fn (vlib_main_t * vm, unformat_input_t * input,
	      vlib_cli_command_t * cmd)
{
  u8 details = 0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "details"))
	details = 1;
      else
	{
	  return clib_error_return (0, "unknown input `%U'",
				    format_unformat_error, input);
	}
    }

  if (details)
    show_bond_details (vm);
  else
    show_bond (vm);

  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_bond_command, static) = {
  .path = "show bond",
  .short_help = "show bond [details]",
  .function = show_bond_fn,
};
/* *INDENT-ON* */

void
bond_set_intf_weight (vlib_main_t * vm, bond_set_intf_weight_args_t * args)
{
  member_if_t *mif;
  bond_if_t *bif;
  vnet_main_t *vnm;
  u32 old_weight;

  mif = bond_get_member_by_sw_if_index (args->sw_if_index);
  if (!mif)
    {
      args->rv = VNET_API_ERROR_INVALID_INTERFACE;
      args->error = clib_error_return (0, "Interface not a member");
      return;
    }
  bif = bond_get_bond_if_by_dev_instance (mif->bif_dev_instance);
  if (!bif)
    {
      args->rv = VNET_API_ERROR_INVALID_INTERFACE;
      args->error = clib_error_return (0, "bond interface not found");
      return;
    }
  if (bif->mode != BOND_MODE_ACTIVE_BACKUP)
    {
      args->rv = VNET_API_ERROR_INVALID_ARGUMENT;
      args->error =
	clib_error_return (0, "Weight valid for active-backup only");
      return;
    }

  old_weight = mif->weight;
  mif->weight = args->weight;
  vnm = vnet_get_main ();
  /*
   * No need to sort the list if the affected member is not up (not in active
   * member set), active member count is 1, or the current member is already the
   * primary member and new weight > old weight.
   */
  if (!vnet_sw_interface_is_up (vnm, mif->sw_if_index) ||
      (vec_len (bif->active_members) == 1) ||
      ((bif->active_members[0] == mif->sw_if_index) &&
       (mif->weight >= old_weight)))
    return;

  bond_sort_members (bif);
}

static clib_error_t *
bond_set_intf_cmd (vlib_main_t * vm, unformat_input_t * input,
		   vlib_cli_command_t * cmd)
{
  bond_set_intf_weight_args_t args = { 0 };
  u32 sw_if_index = (u32) ~ 0;
  unformat_input_t _line_input, *line_input = &_line_input;
  vnet_main_t *vnm = vnet_get_main ();
  u8 weight_enter = 0;
  u32 weight = 0;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return clib_error_return (0, "Missing required arguments.");

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "sw_if_index %d", &sw_if_index))
	;
      else if (unformat (line_input, "%U", unformat_vnet_sw_interface, vnm,
			 &sw_if_index))
	;
      else if (unformat (line_input, "weight %u", &weight))
	weight_enter = 1;
      else
	{
	  clib_error_return (0, "unknown input `%U'", format_unformat_error,
			     input);
	  break;
	}
    }

  unformat_free (line_input);
  if (sw_if_index == (u32) ~ 0)
    {
      args.rv = VNET_API_ERROR_INVALID_INTERFACE;
      clib_error_return (0, "Interface name is invalid!");
    }
  if (weight_enter == 0)
    {
      args.rv = VNET_API_ERROR_INVALID_ARGUMENT;
      clib_error_return (0, "weight missing");
    }

  args.sw_if_index = sw_if_index;
  args.weight = weight;
  bond_set_intf_weight (vm, &args);

  return args.error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND(set_interface_bond_cmd, static) = {
  .path = "set interface bond",
  .short_help = "set interface bond <interface> | sw_if_index <idx>"
                " weight <value>",
  .function = bond_set_intf_cmd,
};
/* *INDENT-ON* */

clib_error_t *
bond_cli_init (vlib_main_t * vm)
{
  bond_main_t *bm = &bond_main;

  bm->vlib_main = vm;
  bm->vnet_main = vnet_get_main ();
  vec_validate_aligned (bm->member_by_sw_if_index, 1, CLIB_CACHE_LINE_BYTES);
  vec_validate_aligned (bm->per_thread_data,
			vlib_get_thread_main ()->n_vlib_mains - 1,
			CLIB_CACHE_LINE_BYTES);

  return 0;
}

VLIB_INIT_FUNCTION (bond_cli_init);

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