[PATCH net-next 4/4] mlxsw: spectrum_span: Support VLAN under mirror-to-gretap

[Ido Schimmel]

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

When mirroring to a gretap or ip6gretap device, allow the underlay
packet path to include VLAN devices. The following configurations are
supported in underlay:

- vlan over phys
- vlan-unaware bridge where the egress device is vlan over phys
- vlan over vlan-aware bridge where the egress device is phys

Signed-off-by: Petr Machata <pe...@mellanox.com>
Signed-off-by: Ido Schimmel <ido...@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_span.c    | 27 +++++++++++++++-------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index d90582ee478f..3b77990df599 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -176,21 +176,23 @@ mlxsw_sp_span_entry_bridge_8021q(const struct net_device 
*br_dev,
 {
        struct bridge_vlan_info vinfo;
        struct net_device *edev;
-       u16 pvid;
+       u16 vid = *p_vid;
 
-       if (WARN_ON(br_vlan_get_pvid(br_dev, &pvid)))
+       if (!vid && WARN_ON(br_vlan_get_pvid(br_dev, &vid)))
                return NULL;
-       if (!pvid)
+       if (!vid ||
+           br_vlan_get_info(br_dev, vid, &vinfo) ||
+           !(vinfo.flags & BRIDGE_VLAN_INFO_BRENTRY))
                return NULL;
 
-       edev = br_fdb_find_port(br_dev, dmac, pvid);
+       edev = br_fdb_find_port(br_dev, dmac, vid);
        if (!edev)
                return NULL;
 
-       if (br_vlan_get_info(edev, pvid, &vinfo))
+       if (br_vlan_get_info(edev, vid, &vinfo))
                return NULL;
        if (!(vinfo.flags & BRIDGE_VLAN_INFO_UNTAGGED))
-               *p_vid = pvid;
+               *p_vid = vid;
        return edev;
 }
 
@@ -208,13 +210,13 @@ mlxsw_sp_span_entry_bridge(const struct net_device 
*br_dev,
 {
        struct mlxsw_sp_bridge_port *bridge_port;
        enum mlxsw_reg_spms_state spms_state;
+       struct net_device *dev = NULL;
        struct mlxsw_sp_port *port;
-       struct net_device *dev;
        u8 stp_state;
 
        if (br_vlan_enabled(br_dev))
                dev = mlxsw_sp_span_entry_bridge_8021q(br_dev, dmac, p_vid);
-       else
+       else if (!*p_vid)
                dev = mlxsw_sp_span_entry_bridge_8021d(br_dev, dmac);
        if (!dev)
                return NULL;
@@ -261,12 +263,21 @@ mlxsw_sp_span_entry_tunnel_parms_common(struct net_device 
*l3edev,
        if (!l3edev || mlxsw_sp_span_dmac(tbl, &gw, l3edev, dmac))
                goto unoffloadable;
 
+       if (is_vlan_dev(l3edev))
+               l3edev = mlxsw_sp_span_entry_vlan(l3edev, &vid);
+
        if (netif_is_bridge_master(l3edev)) {
                l3edev = mlxsw_sp_span_entry_bridge(l3edev, dmac, &vid);
                if (!l3edev)
                        goto unoffloadable;
        }
 
+       if (is_vlan_dev(l3edev)) {
+               if (vid || !(l3edev->flags & IFF_UP))
+                       goto unoffloadable;
+               l3edev = mlxsw_sp_span_entry_vlan(l3edev, &vid);
+       }
+
        if (!mlxsw_sp_port_dev_check(l3edev))
                goto unoffloadable;
 
-- 
2.14.3