mlxsw: spectrum_router: Don't reflect LINKDOWN nexthops

The kernel resolves the nexthops for a given route using
FIB_LOOKUP_IGNORE_LINKSTATE which means a notification can be sent for a
route with one of its nexthops being LINKDOWN.

In case IGNORE_ROUTES_WITH_LINKDOWN is set for the nexthop netdev, then
we shouldn't reflect the nexthop to the device's table.

Once the nexthop netdev's carrier goes up we'll be notified using NH_ADD
and reflect it to the device.

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>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index a080c95..71ff02f 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -40,6 +40,7 @@
 #include <linux/bitops.h>
 #include <linux/in6.h>
 #include <linux/notifier.h>
+#include <linux/inetdevice.h>
 #include <net/netevent.h>
 #include <net/neighbour.h>
 #include <net/arp.h>
@@ -1548,6 +1549,7 @@ static int mlxsw_sp_nexthop_init(struct mlxsw_sp *mlxsw_sp,
                                 struct fib_nh *fib_nh)
 {
        struct net_device *dev = fib_nh->nh_dev;
+       struct in_device *in_dev;
        struct mlxsw_sp_rif *r;
        int err;
 
@@ -1557,6 +1559,11 @@ static int mlxsw_sp_nexthop_init(struct mlxsw_sp *mlxsw_sp,
        if (err)
                return err;
 
+       in_dev = __in_dev_get_rtnl(dev);
+       if (in_dev && IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) &&
+           fib_nh->nh_flags & RTNH_F_LINKDOWN)
+               return 0;
+
        r = mlxsw_sp_rif_find_by_dev(mlxsw_sp, dev);
        if (!r)
                return 0;
@@ -1660,8 +1667,10 @@ mlxsw_sp_nexthop_group_create(struct mlxsw_sp *mlxsw_sp, struct fib_info *fi)
 
 err_nexthop_group_insert:
 err_nexthop_init:
-       for (i--; i >= 0; i--)
+       for (i--; i >= 0; i--) {
+               nh = &nh_grp->nexthops[i];
                mlxsw_sp_nexthop_fini(mlxsw_sp, nh);
+       }
        kfree(nh_grp);
        return ERR_PTR(err);
 }