[PATCH net-next] mlxsw: spectrum_span: Support LAG under mirror-to-gretap

[Ido Schimmel]

From: Petr Machata <pe...@mellanox.com>

When resolving a path that the packet will take after being encapsulated
in mirror-to-gretap scenarios, one of the devices en route could be a
LAG. In that case, mirror to first up slave that corresponds to a front
panel port.

Signed-off-by: Petr Machata <pe...@mellanox.com>
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index e5f4f7620ab7..da3f7f527360 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -245,6 +245,19 @@ mlxsw_sp_span_entry_vlan(const struct net_device *vlan_dev,
        return vlan_dev_real_dev(vlan_dev);
 }
 
+static struct net_device *
+mlxsw_sp_span_entry_lag(struct net_device *lag_dev)
+{
+       struct net_device *dev;
+       struct list_head *iter;
+
+       netdev_for_each_lower_dev(lag_dev, dev, iter)
+               if ((dev->flags & IFF_UP) && mlxsw_sp_port_dev_check(dev))
+                       return dev;
+
+       return NULL;
+}
+
 static __maybe_unused int
 mlxsw_sp_span_entry_tunnel_parms_common(struct net_device *edev,
                                        union mlxsw_sp_l3addr saddr,
@@ -278,6 +291,14 @@ mlxsw_sp_span_entry_tunnel_parms_common(struct net_device 
*edev,
                edev = mlxsw_sp_span_entry_vlan(edev, &vid);
        }
 
+       if (netif_is_lag_master(edev)) {
+               if (!(edev->flags & IFF_UP))
+                       goto unoffloadable;
+               edev = mlxsw_sp_span_entry_lag(edev);
+               if (!edev)
+                       goto unoffloadable;
+       }
+
        if (!mlxsw_sp_port_dev_check(edev))
                goto unoffloadable;
 
-- 
2.14.3