From: Ido Schimmel <idosch@mellanox.com>
Date: Mon, 22 Jan 2018 09:17:40 +0100
Subject: mlxsw: spectrum_router: Use the nodes list as indication for empty
FIB
Patch-mainline: v4.16-rc1
Git-commit: 4fd003125f66a6c8ef6add934fac7cacdbbe509c
References: bsc#1112374
Currently, each FIB (IPv4 / IPv6) in a virtual router holds a prefix
usage that is used to choose a matching LPM tree, but also to check if
the FIB is empty, so that the LPM tree could be unbound.
Next patches will remove the reliance on the per-FIB prefix usage for
LPM tree matching. Keeping it only to check if the FIB is empty is a
waste, since we can use the nodes ({Prefix, Length}) list instead.
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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -349,14 +349,6 @@ mlxsw_sp_prefix_usage_eq(struct mlxsw_sp
return !memcmp(prefix_usage1, prefix_usage2, sizeof(*prefix_usage1));
}
-static bool
-mlxsw_sp_prefix_usage_none(struct mlxsw_sp_prefix_usage *prefix_usage)
-{
- struct mlxsw_sp_prefix_usage prefix_usage_none = {{ 0 } };
-
- return mlxsw_sp_prefix_usage_eq(prefix_usage, &prefix_usage_none);
-}
-
static void
mlxsw_sp_prefix_usage_cpy(struct mlxsw_sp_prefix_usage *prefix_usage1,
struct mlxsw_sp_prefix_usage *prefix_usage2)
@@ -4231,8 +4223,11 @@ static int mlxsw_sp_fib_lpm_tree_link(st
static void mlxsw_sp_fib_lpm_tree_unlink(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib *fib)
{
- if (!mlxsw_sp_prefix_usage_none(&fib->prefix_usage))
+ if (!list_is_singular(&fib->node_list))
return;
+ /* Last node is being unlinked from the FIB. Unbind the
+ * tree and drop the reference.
+ */
mlxsw_sp_vr_lpm_tree_unbind(mlxsw_sp, fib);
mlxsw_sp_lpm_tree_put(mlxsw_sp, fib->lpm_tree);
fib->lpm_tree = NULL;