mlxsw: Add support for VxLAN with IPv6 underlay

Currently, mlxsw driver supports VxLAN with IPv4 underlay only.
Add support for IPv6 underlay.

The main differences are:

* Learning is not supported for IPv6 FDB entries, use static entries and
  do not allow 'learning' flag for IPv6 VxLAN.

* IPv6 addresses for FDB entries should be saved as part of KVDL.
  Use the new API to allocate and release entries for IPv6 addresses.

* Spectrum ASICs do not fill UDP checksum, while in software IPv6 UDP
  packets with checksum zero are dropped.
  Force the relevant flags which allow the VxLAN device to generate UDP
  packets with zero checksum and also receive them.

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>

1 files changed, 84 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index 53473647870d..65c1724c63b0 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -1321,6 +1321,88 @@ out:
 	return err;
 }
 
+static int mlxsw_sp_port_fdb_tun_uc_op6_sfd_write(struct mlxsw_sp *mlxsw_sp,
+						  const char *mac, u16 fid,
+						  u32 kvdl_index, bool adding)
+{
+	char *sfd_pl;
+	u8 num_rec;
+	int err;
+
+	sfd_pl = kmalloc(MLXSW_REG_SFD_LEN, GFP_KERNEL);
+	if (!sfd_pl)
+		return -ENOMEM;
+
+	mlxsw_reg_sfd_pack(sfd_pl, mlxsw_sp_sfd_op(adding), 0);
+	mlxsw_reg_sfd_uc_tunnel_pack6(sfd_pl, 0, mac, fid,
+				      MLXSW_REG_SFD_REC_ACTION_NOP, kvdl_index);
+	num_rec = mlxsw_reg_sfd_num_rec_get(sfd_pl);
+	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sfd), sfd_pl);
+	if (err)
+		goto out;
+
+	if (num_rec != mlxsw_reg_sfd_num_rec_get(sfd_pl))
+		err = -EBUSY;
+
+out:
+	kfree(sfd_pl);
+	return err;
+}
+
+static int mlxsw_sp_port_fdb_tun_uc_op6_add(struct mlxsw_sp *mlxsw_sp,
+					    const char *mac, u16 fid,
+					    const struct in6_addr *addr)
+{
+	u32 kvdl_index;
+	int err;
+
+	err = mlxsw_sp_nve_ipv6_addr_kvdl_set(mlxsw_sp, addr, &kvdl_index);
+	if (err)
+		return err;
+
+	err = mlxsw_sp_port_fdb_tun_uc_op6_sfd_write(mlxsw_sp, mac, fid,
+						     kvdl_index, true);
+	if (err)
+		goto err_sfd_write;
+
+	err = mlxsw_sp_nve_ipv6_addr_map_replace(mlxsw_sp, mac, fid, addr);
+	if (err)
+		/* Replace can fail only for creating new mapping, so removing
+		 * the FDB entry in the error path is OK.
+		 */
+		goto err_addr_replace;
+
+	return 0;
+
+err_addr_replace:
+	mlxsw_sp_port_fdb_tun_uc_op6_sfd_write(mlxsw_sp, mac, fid, kvdl_index,
+					       false);
+err_sfd_write:
+	mlxsw_sp_nve_ipv6_addr_kvdl_unset(mlxsw_sp, addr);
+	return err;
+}
+
+static void mlxsw_sp_port_fdb_tun_uc_op6_del(struct mlxsw_sp *mlxsw_sp,
+					     const char *mac, u16 fid,
+					     const struct in6_addr *addr)
+{
+	mlxsw_sp_nve_ipv6_addr_map_del(mlxsw_sp, mac, fid);
+	mlxsw_sp_port_fdb_tun_uc_op6_sfd_write(mlxsw_sp, mac, fid, 0, false);
+	mlxsw_sp_nve_ipv6_addr_kvdl_unset(mlxsw_sp, addr);
+}
+
+static int
+mlxsw_sp_port_fdb_tun_uc_op6(struct mlxsw_sp *mlxsw_sp, const char *mac,
+			     u16 fid, const struct in6_addr *addr, bool adding)
+{
+	if (adding)
+		return mlxsw_sp_port_fdb_tun_uc_op6_add(mlxsw_sp, mac, fid,
+							addr);
+
+	mlxsw_sp_port_fdb_tun_uc_op6_del(mlxsw_sp, mac, fid, addr);
+	return 0;
+}
+
 static int mlxsw_sp_port_fdb_tunnel_uc_op(struct mlxsw_sp *mlxsw_sp,
 					  const char *mac, u16 fid,
 					  enum mlxsw_sp_l3proto proto,
@@ -1332,6 +1414,8 @@ static int mlxsw_sp_port_fdb_tunnel_uc_op(struct mlxsw_sp *mlxsw_sp,
 		return mlxsw_sp_port_fdb_tun_uc_op4(mlxsw_sp, dynamic, mac, fid,
 						    addr->addr4, adding);
 	case MLXSW_SP_L3_PROTO_IPV6:
+		return mlxsw_sp_port_fdb_tun_uc_op6(mlxsw_sp, mac, fid,
+						    &addr->addr6, adding);
 	default:
 		WARN_ON(1);
 		return -EOPNOTSUPP;