From cff9437605d5c282c1fe00c63ea5f312a7465646 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Wed, 4 May 2022 09:29:09 +0300 Subject: [PATCH] mlxsw: spectrum_router: Only query neighbour activity when necessary The driver periodically queries the device for activity of neighbour entries in order to report it to the kernel's neighbour table. Avoid unnecessary activity query when no neighbours are installed. Use an atomic variable to track the number of neighbours, as it is read without any locks. Signed-off-by: Ido Schimmel Reviewed-by: Petr Machata Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 6 ++++++ drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h | 1 + 2 files changed, 7 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c index dc820d9f2696..9ac4f3c00349 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c @@ -2360,6 +2360,7 @@ mlxsw_sp_neigh_entry_create(struct mlxsw_sp *mlxsw_sp, struct neighbour *n) goto err_neigh_entry_insert; mlxsw_sp_neigh_counter_alloc(mlxsw_sp, neigh_entry); + atomic_inc(&mlxsw_sp->router->neighs_update.neigh_count); list_add(&neigh_entry->rif_list_node, &rif->neigh_list); return neigh_entry; @@ -2374,6 +2375,7 @@ mlxsw_sp_neigh_entry_destroy(struct mlxsw_sp *mlxsw_sp, struct mlxsw_sp_neigh_entry *neigh_entry) { list_del(&neigh_entry->rif_list_node); + atomic_dec(&mlxsw_sp->router->neighs_update.neigh_count); mlxsw_sp_neigh_counter_free(mlxsw_sp, neigh_entry); mlxsw_sp_neigh_entry_remove(mlxsw_sp, neigh_entry); mlxsw_sp_neigh_entry_free(neigh_entry); @@ -2571,6 +2573,9 @@ static int mlxsw_sp_router_neighs_update_rauhtd(struct mlxsw_sp *mlxsw_sp) char *rauhtd_pl; int err; + if (!atomic_read(&mlxsw_sp->router->neighs_update.neigh_count)) + return 0; + rauhtd_pl = kmalloc(MLXSW_REG_RAUHTD_LEN, GFP_KERNEL); if (!rauhtd_pl) return -ENOMEM; @@ -2950,6 +2955,7 @@ static int mlxsw_sp_neigh_init(struct mlxsw_sp *mlxsw_sp) mlxsw_sp_router_neighs_update_work); INIT_DELAYED_WORK(&mlxsw_sp->router->nexthop_probe_dw, mlxsw_sp_router_probe_unresolved_nexthops); + atomic_set(&mlxsw_sp->router->neighs_update.neigh_count, 0); mlxsw_core_schedule_dw(&mlxsw_sp->router->neighs_update.dw, 0); mlxsw_core_schedule_dw(&mlxsw_sp->router->nexthop_probe_dw, 0); return 0; diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h index fa829658a11b..6e704d807a78 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h @@ -56,6 +56,7 @@ struct mlxsw_sp_router { struct { struct delayed_work dw; unsigned long interval; /* ms */ + atomic_t neigh_count; } neighs_update; struct delayed_work nexthop_probe_dw; #define MLXSW_SP_UNRESOLVED_NH_PROBE_INTERVAL 5000 /* ms */ -- 2.34.1