Merge branch 'mlxsw-Add-VXLAN-support-for-Spectrum-2'

Ido Schimmel says:

====================
mlxsw: Add VXLAN support for Spectrum-2

This patchset adds support for VXLAN tunneling on the Spectrum-2 ASIC.
Spectrum-1 and Spectrum-2 are largely backward compatible in this area,
so not too many changes are required.

Patches #1-#2 expose a function and perform small refactoring towards
the actual Spectrum-2 implementation in patches #3-#4.

Patch #3 adds the required initialization steps on Spectrum-2.

Patch #4 finally enables VXLAN on Spectrum-2.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -507,6 +507,9 @@ void mlxsw_sp_router_nve_demote_decap(struct mlxsw_sp *mlxsw_sp, u32 ul_tb_id,
 				      const union mlxsw_sp_l3addr *ul_sip);
 int mlxsw_sp_router_tb_id_vr_id(struct mlxsw_sp *mlxsw_sp, u32 tb_id,
 				u16 *vr_id);
+int mlxsw_sp_router_ul_rif_get(struct mlxsw_sp *mlxsw_sp, u32 ul_tb_id,
+			       u16 *ul_rif_index);
+void mlxsw_sp_router_ul_rif_put(struct mlxsw_sp *mlxsw_sp, u16 ul_rif_index);
 
 /* spectrum_kvdl.c */
 enum mlxsw_sp_kvdl_entry_type {

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

@@ -28,6 +28,7 @@ struct mlxsw_sp_nve {
 	unsigned int num_nve_tunnels;	/* Protected by RTNL */
 	unsigned int num_max_mc_entries[MLXSW_SP_L3_PROTO_MAX];
 	u32 tunnel_index;
+	u16 ul_rif_index;	/* Reserved for Spectrum */
 };
 
 struct mlxsw_sp_nve_ops {

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

@@ -7,6 +7,7 @@
 #include <net/vxlan.h>
 
 #include "reg.h"
+#include "spectrum.h"
 #include "spectrum_nve.h"
 
 /* Eth (18B) | IPv6 (40B) | UDP (8B) | VxLAN (8B) | Eth (14B) | IPv6 (40B)
@@ -20,9 +21,9 @@
 #define MLXSW_SP_NVE_VXLAN_SUPPORTED_FLAGS	(VXLAN_F_UDP_ZERO_CSUM_TX | \
 						 VXLAN_F_LEARN)
 
-static bool mlxsw_sp1_nve_vxlan_can_offload(const struct mlxsw_sp_nve *nve,
-					    const struct net_device *dev,
-					    struct netlink_ext_ack *extack)
+static bool mlxsw_sp_nve_vxlan_can_offload(const struct mlxsw_sp_nve *nve,
+					   const struct net_device *dev,
+					   struct netlink_ext_ack *extack)
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct vxlan_config *cfg = &vxlan->cfg;
@@ -112,13 +113,30 @@ static int mlxsw_sp_nve_parsing_set(struct mlxsw_sp *mlxsw_sp,
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mprs), mprs_pl);
 }
 
+static void
+mlxsw_sp_nve_vxlan_config_prepare(char *tngcr_pl,
+				  const struct mlxsw_sp_nve_config *config)
+{
+	u8 udp_sport;
+
+	mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, true,
+			     config->ttl);
+	/* VxLAN driver's default UDP source port range is 32768 (0x8000)
+	 * to 60999 (0xee47). Set the upper 8 bits of the UDP source port
+	 * to a random number between 0x80 and 0xee
+	 */
+	get_random_bytes(&udp_sport, sizeof(udp_sport));
+	udp_sport = (udp_sport % (0xee - 0x80 + 1)) + 0x80;
+	mlxsw_reg_tngcr_nve_udp_sport_prefix_set(tngcr_pl, udp_sport);
+	mlxsw_reg_tngcr_usipv4_set(tngcr_pl, be32_to_cpu(config->ul_sip.addr4));
+}
+
 static int
 mlxsw_sp1_nve_vxlan_config_set(struct mlxsw_sp *mlxsw_sp,
 			       const struct mlxsw_sp_nve_config *config)
 {
 	char tngcr_pl[MLXSW_REG_TNGCR_LEN];
 	u16 ul_vr_id;
-	u8 udp_sport;
 	int err;
 
 	err = mlxsw_sp_router_tb_id_vr_id(mlxsw_sp, config->ul_tb_id,
@@ -126,18 +144,9 @@ mlxsw_sp1_nve_vxlan_config_set(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		return err;
 
-	mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, true,
-			     config->ttl);
-	/* VxLAN driver's default UDP source port range is 32768 (0x8000)
-	 * to 60999 (0xee47). Set the upper 8 bits of the UDP source port
-	 * to a random number between 0x80 and 0xee
-	 */
-	get_random_bytes(&udp_sport, sizeof(udp_sport));
-	udp_sport = (udp_sport % (0xee - 0x80 + 1)) + 0x80;
-	mlxsw_reg_tngcr_nve_udp_sport_prefix_set(tngcr_pl, udp_sport);
+	mlxsw_sp_nve_vxlan_config_prepare(tngcr_pl, config);
 	mlxsw_reg_tngcr_learn_enable_set(tngcr_pl, config->learning_en);
 	mlxsw_reg_tngcr_underlay_virtual_router_set(tngcr_pl, ul_vr_id);
-	mlxsw_reg_tngcr_usipv4_set(tngcr_pl, be32_to_cpu(config->ul_sip.addr4));
 
 	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl);
 }
@@ -231,7 +240,7 @@ mlxsw_sp_nve_vxlan_clear_offload(const struct net_device *nve_dev, __be32 vni)
 
 const struct mlxsw_sp_nve_ops mlxsw_sp1_nve_vxlan_ops = {
 	.type		= MLXSW_SP_NVE_TYPE_VXLAN,
-	.can_offload	= mlxsw_sp1_nve_vxlan_can_offload,
+	.can_offload	= mlxsw_sp_nve_vxlan_can_offload,
 	.nve_config	= mlxsw_sp_nve_vxlan_config,
 	.init		= mlxsw_sp1_nve_vxlan_init,
 	.fini		= mlxsw_sp1_nve_vxlan_fini,
@@ -239,26 +248,126 @@ const struct mlxsw_sp_nve_ops mlxsw_sp1_nve_vxlan_ops = {
 	.fdb_clear_offload = mlxsw_sp_nve_vxlan_clear_offload,
 };
 
-static bool mlxsw_sp2_nve_vxlan_can_offload(const struct mlxsw_sp_nve *nve,
-					    const struct net_device *dev,
-					    struct netlink_ext_ack *extack)
+static bool mlxsw_sp2_nve_vxlan_learning_set(struct mlxsw_sp *mlxsw_sp,
+					     bool learning_en)
 {
-	return false;
+	char tnpc_pl[MLXSW_REG_TNPC_LEN];
+
+	mlxsw_reg_tnpc_pack(tnpc_pl, MLXSW_REG_TNPC_TUNNEL_PORT_NVE,
+			    learning_en);
+	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tnpc), tnpc_pl);
+}
+
+static int
+mlxsw_sp2_nve_vxlan_config_set(struct mlxsw_sp *mlxsw_sp,
+			       const struct mlxsw_sp_nve_config *config)
+{
+	char tngcr_pl[MLXSW_REG_TNGCR_LEN];
+	u16 ul_rif_index;
+	int err;
+
+	err = mlxsw_sp_router_ul_rif_get(mlxsw_sp, config->ul_tb_id,
+					 &ul_rif_index);
+	if (err)
+		return err;
+	mlxsw_sp->nve->ul_rif_index = ul_rif_index;
+
+	err = mlxsw_sp2_nve_vxlan_learning_set(mlxsw_sp, config->learning_en);
+	if (err)
+		goto err_vxlan_learning_set;
+
+	mlxsw_sp_nve_vxlan_config_prepare(tngcr_pl, config);
+	mlxsw_reg_tngcr_underlay_rif_set(tngcr_pl, ul_rif_index);
+
+	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl);
+	if (err)
+		goto err_tngcr_write;
+
+	return 0;
+
+err_tngcr_write:
+	mlxsw_sp2_nve_vxlan_learning_set(mlxsw_sp, false);
+err_vxlan_learning_set:
+	mlxsw_sp_router_ul_rif_put(mlxsw_sp, ul_rif_index);
+	return err;
+}
+
+static void mlxsw_sp2_nve_vxlan_config_clear(struct mlxsw_sp *mlxsw_sp)
+{
+	char tngcr_pl[MLXSW_REG_TNGCR_LEN];
+
+	mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, false, 0);
+	mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl);
+	mlxsw_sp2_nve_vxlan_learning_set(mlxsw_sp, false);
+	mlxsw_sp_router_ul_rif_put(mlxsw_sp, mlxsw_sp->nve->ul_rif_index);
+}
+
+static int mlxsw_sp2_nve_vxlan_rtdp_set(struct mlxsw_sp *mlxsw_sp,
+					unsigned int tunnel_index,
+					u16 ul_rif_index)
+{
+	char rtdp_pl[MLXSW_REG_RTDP_LEN];
+
+	mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_NVE, tunnel_index);
+	mlxsw_reg_rtdp_egress_router_interface_set(rtdp_pl, ul_rif_index);
+
+	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl);
 }
 
 static int mlxsw_sp2_nve_vxlan_init(struct mlxsw_sp_nve *nve,
 				    const struct mlxsw_sp_nve_config *config)
 {
-	return -EOPNOTSUPP;
+	struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp;
+	int err;
+
+	err = mlxsw_sp_nve_parsing_set(mlxsw_sp,
+				       MLXSW_SP_NVE_VXLAN_PARSING_DEPTH,
+				       config->udp_dport);
+	if (err)
+		return err;
+
+	err = mlxsw_sp2_nve_vxlan_config_set(mlxsw_sp, config);
+	if (err)
+		goto err_config_set;
+
+	err = mlxsw_sp2_nve_vxlan_rtdp_set(mlxsw_sp, nve->tunnel_index,
+					   nve->ul_rif_index);
+	if (err)
+		goto err_rtdp_set;
+
+	err = mlxsw_sp_router_nve_promote_decap(mlxsw_sp, config->ul_tb_id,
+						config->ul_proto,
+						&config->ul_sip,
+						nve->tunnel_index);
+	if (err)
+		goto err_promote_decap;
+
+	return 0;
+
+err_promote_decap:
+err_rtdp_set:
+	mlxsw_sp2_nve_vxlan_config_clear(mlxsw_sp);
+err_config_set:
+	mlxsw_sp_nve_parsing_set(mlxsw_sp, MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH,
+				 config->udp_dport);
+	return err;
 }
 
 static void mlxsw_sp2_nve_vxlan_fini(struct mlxsw_sp_nve *nve)
 {
+	struct mlxsw_sp_nve_config *config = &nve->config;
+	struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp;
+
+	mlxsw_sp_router_nve_demote_decap(mlxsw_sp, config->ul_tb_id,
+					 config->ul_proto, &config->ul_sip);
+	mlxsw_sp2_nve_vxlan_config_clear(mlxsw_sp);
+	mlxsw_sp_nve_parsing_set(mlxsw_sp, MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH,
+				 config->udp_dport);
 }
 
 const struct mlxsw_sp_nve_ops mlxsw_sp2_nve_vxlan_ops = {
 	.type		= MLXSW_SP_NVE_TYPE_VXLAN,
-	.can_offload	= mlxsw_sp2_nve_vxlan_can_offload,
+	.can_offload	= mlxsw_sp_nve_vxlan_can_offload,
 	.nve_config	= mlxsw_sp_nve_vxlan_config,
 	.init		= mlxsw_sp2_nve_vxlan_init,
 	.fini		= mlxsw_sp2_nve_vxlan_fini,

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

@@ -7595,6 +7595,34 @@ static void mlxsw_sp_ul_rif_put(struct mlxsw_sp_rif *ul_rif)
 	mlxsw_sp_vr_put(mlxsw_sp, vr);
 }
 
+int mlxsw_sp_router_ul_rif_get(struct mlxsw_sp *mlxsw_sp, u32 ul_tb_id,
+			       u16 *ul_rif_index)
+{
+	struct mlxsw_sp_rif *ul_rif;
+
+	ASSERT_RTNL();
+
+	ul_rif = mlxsw_sp_ul_rif_get(mlxsw_sp, ul_tb_id, NULL);
+	if (IS_ERR(ul_rif))
+		return PTR_ERR(ul_rif);
+	*ul_rif_index = ul_rif->rif_index;
+
+	return 0;
+}
+
+void mlxsw_sp_router_ul_rif_put(struct mlxsw_sp *mlxsw_sp, u16 ul_rif_index)
+{
+	struct mlxsw_sp_rif *ul_rif;
+
+	ASSERT_RTNL();
+
+	ul_rif = mlxsw_sp->router->rifs[ul_rif_index];
+	if (WARN_ON(!ul_rif))
+		return;
+
+	mlxsw_sp_ul_rif_put(ul_rif);
+}
+
 static int
 mlxsw_sp2_rif_ipip_lb_configure(struct mlxsw_sp_rif *rif)
 {