4.14-stable review patch.  If anyone has any objections, please let me know.


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

[ Upstream commit d1c95af366961101819f07e3c64d44f3be7f0367 ]

When mlxsw replaces (or deletes) a route it removes the offload
indication from the replaced route. This is problematic for IPv4 routes,
as the offload indication is stored in the fib_info which is usually
shared between multiple routes.

Instead of unconditionally clearing the offload indication, only clear
it if no other route is using the fib_info.

Fixes: 3984d1a89fe7 ("mlxsw: spectrum_router: Provide offload indication using 
nexthop flags")
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
Reported-by: Alexander Petrovskiy <ale...@mellanox.com>
Tested-by: Alexander Petrovskiy <ale...@mellanox.com>
Signed-off-by: Jiri Pirko <j...@mellanox.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -3032,6 +3032,9 @@ mlxsw_sp_fib4_entry_offload_unset(struct
        struct mlxsw_sp_nexthop_group *nh_grp = fib_entry->nh_group;
        int i;
+       if (!list_is_singular(&nh_grp->fib_list))
+               return;
        for (i = 0; i < nh_grp->count; i++) {
                struct mlxsw_sp_nexthop *nh = &nh_grp->nexthops[i];

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