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mlxsw: Add the unresolved next-hops probes

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Now, the driver sends arp probes for all unresolved neighbours that are
currently a nexthop for some route on the system. The job is set
periodically every 5 seconds.

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yotam Gigi 2016-07-05 11:27:52 +02:00 committed by David S. Miller
parent b2157149b0
commit 0b2361d9d9
2 changed files with 34 additions and 1 deletions
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2
drivers/net/ethernet/mellanox/mlxsw/spectrum.h
View file

@ -222,6 +222,8 @@ struct mlxsw_sp_router {
struct delayed_work dw;
unsigned long interval; /* ms */
} neighs_update;
struct delayed_work nexthop_probe_dw;
#define MLXSW_SP_UNRESOLVED_NH_PROBE_INTERVAL 5000 /* ms */
struct list_head nexthop_group_list;
struct list_head nexthop_neighs_list;
};

33
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
View file

@ -845,6 +845,33 @@ static void mlxsw_sp_router_neighs_update_work(struct work_struct *work)
mlxsw_sp_router_neighs_update_work_schedule(mlxsw_sp);
}
static void mlxsw_sp_router_probe_unresolved_nexthops(struct work_struct *work)
{
struct mlxsw_sp_neigh_entry *neigh_entry;
struct mlxsw_sp *mlxsw_sp = container_of(work, struct mlxsw_sp,
router.nexthop_probe_dw.work);
/* Iterate over nexthop neighbours, find those who are unresolved and
* send arp on them. This solves the chicken-egg problem when
* the nexthop wouldn't get offloaded until the neighbor is resolved
* but it wouldn't get resolved ever in case traffic is flowing in HW
* using different nexthop.
*
* Take RTNL mutex here to prevent lists from changes.
*/
rtnl_lock();
list_for_each_entry(neigh_entry, &mlxsw_sp->router.nexthop_neighs_list,
nexthop_neighs_list_node) {
if (!(neigh_entry->n->nud_state & NUD_VALID) &&
!list_empty(&neigh_entry->nexthop_list))
neigh_event_send(neigh_entry->n, NULL);
}
rtnl_unlock();
mlxsw_core_schedule_dw(&mlxsw_sp->router.nexthop_probe_dw,
MLXSW_SP_UNRESOLVED_NH_PROBE_INTERVAL);
}
static void
mlxsw_sp_nexthop_neigh_update(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_neigh_entry *neigh_entry,
@ -1004,10 +1031,13 @@ static int mlxsw_sp_neigh_init(struct mlxsw_sp *mlxsw_sp)
if (err)
goto err_register_netevent_notifier;
/* Create the delayed works for the activity_update */
INIT_DELAYED_WORK(&mlxsw_sp->router.neighs_update.dw,
mlxsw_sp_router_neighs_update_work);
INIT_DELAYED_WORK(&mlxsw_sp->router.nexthop_probe_dw,
mlxsw_sp_router_probe_unresolved_nexthops);
mlxsw_core_schedule_dw(&mlxsw_sp->router.neighs_update.dw, 0);
mlxsw_core_schedule_dw(&mlxsw_sp->router.nexthop_probe_dw, 0);
return 0;
err_register_netevent_notifier:
@ -1018,6 +1048,7 @@ static int mlxsw_sp_neigh_init(struct mlxsw_sp *mlxsw_sp)
static void mlxsw_sp_neigh_fini(struct mlxsw_sp *mlxsw_sp)
{
cancel_delayed_work_sync(&mlxsw_sp->router.neighs_update.dw);
cancel_delayed_work_sync(&mlxsw_sp->router.nexthop_probe_dw);
unregister_netevent_notifier(&mlxsw_sp_router_netevent_nb);
rhashtable_destroy(&mlxsw_sp->router.neigh_ht);
}