[PATCH net-next 8/9] mlxsw: spectrum_router: Add an indication if a nexthop group can be destroyed

[Ido Schimmel]

From: Ido Schimmel <ido...@nvidia.com>

Currently, a nexthop group is destroyed when the last FIB entry is
detached from it.

When nexthop objects are supported, this can no longer be the case, as
the group is a separate object whose lifetime is managed by user space.

Add an indication if a nexthop group can be destroyed and always set it
to true for the existing IPv4 and IPv6 nexthop groups.

Signed-off-by: Ido Schimmel <ido...@nvidia.com>
Reviewed-by: Jiri Pirko <j...@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 645ec70314d2..87b8c8db688b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -2897,6 +2897,7 @@ struct mlxsw_sp_nexthop_group {
        };
        struct mlxsw_sp_nexthop_group_info *nhgi;
        enum mlxsw_sp_nexthop_group_type type;
+       bool can_destroy;
 };
 
 void mlxsw_sp_nexthop_counter_alloc(struct mlxsw_sp *mlxsw_sp,
@@ -4173,6 +4174,8 @@ mlxsw_sp_nexthop4_group_create(struct mlxsw_sp *mlxsw_sp, 
struct fib_info *fi)
        if (err)
                goto err_nexthop_group_insert;
 
+       nh_grp->can_destroy = true;
+
        return nh_grp;
 
 err_nexthop_group_insert:
@@ -4187,6 +4190,8 @@ static void
 mlxsw_sp_nexthop4_group_destroy(struct mlxsw_sp *mlxsw_sp,
                                struct mlxsw_sp_nexthop_group *nh_grp)
 {
+       if (!nh_grp->can_destroy)
+               return;
        mlxsw_sp_nexthop_group_remove(mlxsw_sp, nh_grp);
        mlxsw_sp_nexthop4_group_info_fini(mlxsw_sp, nh_grp);
        fib_info_put(nh_grp->ipv4.fi);
@@ -5479,6 +5484,8 @@ mlxsw_sp_nexthop6_group_create(struct mlxsw_sp *mlxsw_sp,
        if (err)
                goto err_nexthop_group_insert;
 
+       nh_grp->can_destroy = true;
+
        return nh_grp;
 
 err_nexthop_group_insert:
@@ -5492,6 +5499,8 @@ static void
 mlxsw_sp_nexthop6_group_destroy(struct mlxsw_sp *mlxsw_sp,
                                struct mlxsw_sp_nexthop_group *nh_grp)
 {
+       if (!nh_grp->can_destroy)
+               return;
        mlxsw_sp_nexthop_group_remove(mlxsw_sp, nh_grp);
        mlxsw_sp_nexthop6_group_info_fini(mlxsw_sp, nh_grp);
        kfree(nh_grp);
-- 
2.28.0