netdev - [PATCH net 3/3] mlxsw: spectrum_router: Handle MTU change of GRE netdevs

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Date:   Thu, 22 Mar 2018 19:53:35 +0200
From:   Ido Schimmel <idosch@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...lanox.com, lucien.xin@...il.com,
        mlxsw@...lanox.com, Petr Machata <petrm@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net 3/3] mlxsw: spectrum_router: Handle MTU change of GRE netdevs

From: Petr Machata <petrm@...lanox.com>

Update MTU of overlay loopback in accordance with the setting on the
tunnel netdevice.

Fixes: 0063587d3587 ("mlxsw: spectrum: Support decap-only IP-in-IP tunnels")
Signed-off-by: Petr Machata <petrm@...lanox.com>
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c  | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index a7d0adf068ec..997e24dcb053 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -1407,6 +1407,28 @@ mlxsw_sp_rif_ipip_lb_op(struct mlxsw_sp_rif_ipip_lb *lb_rif,
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ritr), ritr_pl);
 }
 
+static int mlxsw_sp_netdevice_ipip_ol_update_mtu(struct mlxsw_sp *mlxsw_sp,
+						 struct net_device *ol_dev)
+{
+	struct mlxsw_sp_ipip_entry *ipip_entry;
+	struct mlxsw_sp_rif_ipip_lb *lb_rif;
+	struct mlxsw_sp_vr *ul_vr;
+	int err = 0;
+
+	ipip_entry = mlxsw_sp_ipip_entry_find_by_ol_dev(mlxsw_sp, ol_dev);
+	if (ipip_entry) {
+		lb_rif = ipip_entry->ol_lb;
+		ul_vr = &mlxsw_sp->router->vrs[lb_rif->ul_vr_id];
+		err = mlxsw_sp_rif_ipip_lb_op(lb_rif, ul_vr, true);
+		if (err)
+			goto out;
+		lb_rif->common.mtu = ol_dev->mtu;
+	}
+
+out:
+	return err;
+}
+
 static void mlxsw_sp_netdevice_ipip_ol_up_event(struct mlxsw_sp *mlxsw_sp,
 						struct net_device *ol_dev)
 {
@@ -1687,6 +1709,8 @@ int mlxsw_sp_netdevice_ipip_ol_event(struct mlxsw_sp *mlxsw_sp,
 		extack = info->extack;
 		return mlxsw_sp_netdevice_ipip_ol_change_event(mlxsw_sp,
 							       ol_dev, extack);
+	case NETDEV_CHANGEMTU:
+		return mlxsw_sp_netdevice_ipip_ol_update_mtu(mlxsw_sp, ol_dev);
 	}
 	return 0;
 }
-- 
2.14.3