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// SPDX-License-Identifier: GPL-2.0-or-later
/* BGP Nexthop Group Support
* Copyright (C) 2023 NVIDIA Corporation
* Copyright (C) 2023 6WIND
*/
#include <zebra.h>
#include <bgpd/bgpd.h>
#include <bgpd/bgp_debug.h>
#include <bgpd/bgp_nhg.h>
/****************************************************************************
* L3 NHGs are used for fast failover of nexthops in the dplane. These are
* the APIs for allocating L3 NHG ids. Management of the L3 NHG itself is
* left to the application using it.
* PS: Currently EVPN host routes is the only app using L3 NHG for fast
* failover of remote ES links.
***************************************************************************/
static bitfield_t bgp_nh_id_bitmap;
static uint32_t bgp_nhg_start;
/* XXX - currently we do nothing on the callbacks */
static void bgp_nhg_add_cb(const char *name)
{
}
static void bgp_nhg_modify_cb(const struct nexthop_group_cmd *nhgc)
{
}
static void bgp_nhg_add_nexthop_cb(const struct nexthop_group_cmd *nhgc,
const struct nexthop *nhop)
{
}
static void bgp_nhg_del_nexthop_cb(const struct nexthop_group_cmd *nhgc,
const struct nexthop *nhop)
{
}
static void bgp_nhg_del_cb(const char *name)
{
}
static void bgp_nhg_zebra_init(void)
{
static bool bgp_nhg_zebra_inited;
if (bgp_nhg_zebra_inited)
return;
bgp_nhg_zebra_inited = true;
bgp_nhg_start = zclient_get_nhg_start(ZEBRA_ROUTE_BGP);
nexthop_group_init(bgp_nhg_add_cb, bgp_nhg_modify_cb,
bgp_nhg_add_nexthop_cb, bgp_nhg_del_nexthop_cb,
bgp_nhg_del_cb);
}
void bgp_nhg_init(void)
{
uint32_t id_max;
id_max = MIN(ZEBRA_NHG_PROTO_SPACING - 1, 16 * 1024);
bf_init(bgp_nh_id_bitmap, id_max);
bf_assign_zero_index(bgp_nh_id_bitmap);
if (BGP_DEBUG(nht, NHT) || BGP_DEBUG(evpn_mh, EVPN_MH_ES))
zlog_debug("bgp nhg range %u - %u", bgp_nhg_start + 1,
bgp_nhg_start + id_max);
}
void bgp_nhg_finish(void)
{
bf_free(bgp_nh_id_bitmap);
}
uint32_t bgp_nhg_id_alloc(void)
{
uint32_t nhg_id = 0;
bgp_nhg_zebra_init();
bf_assign_index(bgp_nh_id_bitmap, nhg_id);
if (nhg_id)
nhg_id += bgp_nhg_start;
return nhg_id;
}
void bgp_nhg_id_free(uint32_t nhg_id)
{
if (!nhg_id || (nhg_id <= bgp_nhg_start))
return;
nhg_id -= bgp_nhg_start;
bf_release_index(bgp_nh_id_bitmap, nhg_id);
}
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