mlxsw: Allow 802.1d and .1ad VxLAN bridges to coexist on Spectrum>=2

Currently only one EtherType can be configured for pushing in tunnels
because EtherType is configured using SPVID.et_vlan for tunnel port.

This behavior is forbidden by comparing mlxsw_sp_nve_config struct for
each new tunnel, the struct contains 'ethertype' field which means that
only one EtherType is legal at any given time. Remove 'ethertype' field to
allow creating VxLAN devices with different bridges.

To allow using several types of VxLAN bridges at the same time, the
EtherType should be determined at the egress port. This behavior is
achieved by setting SPVID to decide which EtherType to push at egress and
for each local_port which is member in 802.1ad bridge, set SPEVET.et_vlan
to ether_type1 (i.e., 0x88A8).

Use switchdev_ops->init() to set different mlxsw_sp_bridge_ops for
different ASICs in order to be able to split the behavior when port joins /
leaves an 802.1ad bridge in different ASICs.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_nve.h

@@ -18,7 +18,6 @@ struct mlxsw_sp_nve_config {
 	u32 ul_tb_id;
 	enum mlxsw_sp_l3proto ul_proto;
 	union mlxsw_sp_l3addr ul_sip;
-	u16 ethertype;
 };
 
 struct mlxsw_sp_nve {

drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c

@@ -113,7 +113,6 @@ static void mlxsw_sp_nve_vxlan_config(const struct mlxsw_sp_nve *nve,
 	config->ul_proto = MLXSW_SP_L3_PROTO_IPV4;
 	config->ul_sip.addr4 = cfg->saddr.sin.sin_addr.s_addr;
 	config->udp_dport = cfg->dst_port;
-	config->ethertype = params->ethertype;
 }
 
 static int __mlxsw_sp_nve_parsing_set(struct mlxsw_sp *mlxsw_sp,
@@ -318,20 +317,14 @@ static bool mlxsw_sp2_nve_vxlan_learning_set(struct mlxsw_sp *mlxsw_sp,
 }
 
 static int
-mlxsw_sp2_nve_decap_ethertype_set(struct mlxsw_sp *mlxsw_sp, u16 ethertype)
+mlxsw_sp2_nve_decap_ethertype_set(struct mlxsw_sp *mlxsw_sp)
 {
 	char spvid_pl[MLXSW_REG_SPVID_LEN] = {};
-	u8 sver_type;
-	int err;
 
 	mlxsw_reg_spvid_tport_set(spvid_pl, true);
 	mlxsw_reg_spvid_local_port_set(spvid_pl,
 				       MLXSW_REG_TUNNEL_PORT_NVE);
-	err = mlxsw_sp_ethtype_to_sver_type(ethertype, &sver_type);
-	if (err)
-		return err;
-
-	mlxsw_reg_spvid_et_vlan_set(spvid_pl, sver_type);
+	mlxsw_reg_spvid_egr_et_set_set(spvid_pl, true);
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(spvid), spvid_pl);
 }
 
@@ -367,7 +360,7 @@ mlxsw_sp2_nve_vxlan_config_set(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_spvtr_write;
 
-	err = mlxsw_sp2_nve_decap_ethertype_set(mlxsw_sp, config->ethertype);
+	err = mlxsw_sp2_nve_decap_ethertype_set(mlxsw_sp);
 	if (err)
 		goto err_decap_ethertype_set;
 
@@ -392,8 +385,6 @@ static void mlxsw_sp2_nve_vxlan_config_clear(struct mlxsw_sp *mlxsw_sp)
 	char spvtr_pl[MLXSW_REG_SPVTR_LEN];
 	char tngcr_pl[MLXSW_REG_TNGCR_LEN];
 
-	/* Set default EtherType */
-	mlxsw_sp2_nve_decap_ethertype_set(mlxsw_sp, ETH_P_8021Q);
 	mlxsw_reg_spvtr_pack(spvtr_pl, true, MLXSW_REG_TUNNEL_PORT_NVE,
 			     MLXSW_REG_SPVTR_IPVID_MODE_IEEE_COMPLIANT_PVID);
 	mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(spvtr), spvtr_pl);

drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c

@@ -2300,7 +2300,7 @@ mlxsw_sp_bridge_8021ad_vxlan_join(struct mlxsw_sp_bridge_device *bridge_device,
 						     vid, ETH_P_8021AD, extack);
 }
 
-static const struct mlxsw_sp_bridge_ops mlxsw_sp_bridge_8021ad_ops = {
+static const struct mlxsw_sp_bridge_ops mlxsw_sp1_bridge_8021ad_ops = {
 	.port_join	= mlxsw_sp_bridge_8021ad_port_join,
 	.port_leave	= mlxsw_sp_bridge_8021ad_port_leave,
 	.vxlan_join	= mlxsw_sp_bridge_8021ad_vxlan_join,
@@ -2309,6 +2309,53 @@ static const struct mlxsw_sp_bridge_ops mlxsw_sp_bridge_8021ad_ops = {
 	.fid_vid	= mlxsw_sp_bridge_8021q_fid_vid,
 };
 
+static int
+mlxsw_sp2_bridge_8021ad_port_join(struct mlxsw_sp_bridge_device *bridge_device,
+				  struct mlxsw_sp_bridge_port *bridge_port,
+				  struct mlxsw_sp_port *mlxsw_sp_port,
+				  struct netlink_ext_ack *extack)
+{
+	int err;
+
+	/* The EtherType of decapsulated packets is determined at the egress
+	 * port to allow 802.1d and 802.1ad bridges with VXLAN devices to
+	 * co-exist.
+	 */
+	err = mlxsw_sp_port_egress_ethtype_set(mlxsw_sp_port, ETH_P_8021AD);
+	if (err)
+		return err;
+
+	err = mlxsw_sp_bridge_8021ad_port_join(bridge_device, bridge_port,
+					       mlxsw_sp_port, extack);
+	if (err)
+		goto err_bridge_8021ad_port_join;
+
+	return 0;
+
+err_bridge_8021ad_port_join:
+	mlxsw_sp_port_egress_ethtype_set(mlxsw_sp_port, ETH_P_8021Q);
+	return err;
+}
+
+static void
+mlxsw_sp2_bridge_8021ad_port_leave(struct mlxsw_sp_bridge_device *bridge_device,
+				   struct mlxsw_sp_bridge_port *bridge_port,
+				   struct mlxsw_sp_port *mlxsw_sp_port)
+{
+	mlxsw_sp_bridge_8021ad_port_leave(bridge_device, bridge_port,
+					  mlxsw_sp_port);
+	mlxsw_sp_port_egress_ethtype_set(mlxsw_sp_port, ETH_P_8021Q);
+}
+
+static const struct mlxsw_sp_bridge_ops mlxsw_sp2_bridge_8021ad_ops = {
+	.port_join	= mlxsw_sp2_bridge_8021ad_port_join,
+	.port_leave	= mlxsw_sp2_bridge_8021ad_port_leave,
+	.vxlan_join	= mlxsw_sp_bridge_8021ad_vxlan_join,
+	.fid_get	= mlxsw_sp_bridge_8021q_fid_get,
+	.fid_lookup	= mlxsw_sp_bridge_8021q_fid_lookup,
+	.fid_vid	= mlxsw_sp_bridge_8021q_fid_vid,
+};
+
 int mlxsw_sp_port_bridge_join(struct mlxsw_sp_port *mlxsw_sp_port,
 			      struct net_device *brport_dev,
 			      struct net_device *br_dev,
@@ -3541,6 +3588,7 @@ static void mlxsw_sp_fdb_fini(struct mlxsw_sp *mlxsw_sp)
 
 static void mlxsw_sp1_switchdev_init(struct mlxsw_sp *mlxsw_sp)
 {
+	mlxsw_sp->bridge->bridge_8021ad_ops = &mlxsw_sp1_bridge_8021ad_ops;
 }
 
 const struct mlxsw_sp_switchdev_ops mlxsw_sp1_switchdev_ops = {
@@ -3549,6 +3597,7 @@ const struct mlxsw_sp_switchdev_ops mlxsw_sp1_switchdev_ops = {
 
 static void mlxsw_sp2_switchdev_init(struct mlxsw_sp *mlxsw_sp)
 {
+	mlxsw_sp->bridge->bridge_8021ad_ops = &mlxsw_sp2_bridge_8021ad_ops;
 }
 
 const struct mlxsw_sp_switchdev_ops mlxsw_sp2_switchdev_ops = {
@@ -3569,7 +3618,6 @@ int mlxsw_sp_switchdev_init(struct mlxsw_sp *mlxsw_sp)
 
 	bridge->bridge_8021q_ops = &mlxsw_sp_bridge_8021q_ops;
 	bridge->bridge_8021d_ops = &mlxsw_sp_bridge_8021d_ops;
-	bridge->bridge_8021ad_ops = &mlxsw_sp_bridge_8021ad_ops;
 
 	mlxsw_sp->switchdev_ops->init(mlxsw_sp);