diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c new file mode 100644 index 000000000000..702fe945227c --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c @@ -0,0 +1,214 @@ +/* + * drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c + * Copyright (c) 2017 Mellanox Technologies. All rights reserved. + * Copyright (c) 2017 Petr Machata <petrm@mellanox.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the names of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <net/ip_tunnels.h> + +#include "spectrum_ipip.h" + +static bool +mlxsw_sp_ipip_netdev_has_ikey(const struct net_device *ol_dev) +{ + struct ip_tunnel *tun = netdev_priv(ol_dev); + + return !!(tun->parms.i_flags & TUNNEL_KEY); +} + +static bool +mlxsw_sp_ipip_netdev_has_okey(const struct net_device *ol_dev) +{ + struct ip_tunnel *tun = netdev_priv(ol_dev); + + return !!(tun->parms.o_flags & TUNNEL_KEY); +} + +static u32 mlxsw_sp_ipip_netdev_ikey(const struct net_device *ol_dev) +{ + struct ip_tunnel *tun = netdev_priv(ol_dev); + + return mlxsw_sp_ipip_netdev_has_ikey(ol_dev) ? + be32_to_cpu(tun->parms.i_key) : 0; +} + +static u32 mlxsw_sp_ipip_netdev_okey(const struct net_device *ol_dev) +{ + struct ip_tunnel *tun = netdev_priv(ol_dev); + + return mlxsw_sp_ipip_netdev_has_okey(ol_dev) ? + be32_to_cpu(tun->parms.o_key) : 0; +} + +static int +mlxsw_sp_ipip_nexthop_update_gre4(struct mlxsw_sp *mlxsw_sp, u32 adj_index, + struct mlxsw_sp_ipip_entry *ipip_entry) +{ + u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb); + __be32 daddr4 = mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev); + char ratr_pl[MLXSW_REG_RATR_LEN]; + + mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY, + true, MLXSW_REG_RATR_TYPE_IPIP, + adj_index, rif_index); + mlxsw_reg_ratr_ipip4_entry_pack(ratr_pl, be32_to_cpu(daddr4)); + + return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl); +} + +static int +mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp, + u32 tunnel_index, + struct mlxsw_sp_ipip_entry *ipip_entry) +{ + bool has_ikey = mlxsw_sp_ipip_netdev_has_ikey(ipip_entry->ol_dev); + u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb); + u32 ikey = mlxsw_sp_ipip_netdev_ikey(ipip_entry->ol_dev); + char rtdp_pl[MLXSW_REG_RTDP_LEN]; + unsigned int type_check; + u32 daddr4; + + mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_IPIP, tunnel_index); + + type_check = has_ikey ? + MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY : + MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE; + + /* Linux demuxes tunnels based on packet SIP (which must match tunnel + * remote IP). Thus configure decap so that it filters out packets that + * are not IPv4 or have the wrong SIP. IPIP_DECAP_ERROR trap is + * generated for packets that fail this criterion. Linux then handles + * such packets in slow path and generates ICMP destination unreachable. + */ + daddr4 = be32_to_cpu(mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev)); + mlxsw_reg_rtdp_ipip4_pack(rtdp_pl, rif_index, + MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4, + type_check, has_ikey, daddr4, ikey); + + return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl); +} + +static int +mlxsw_sp_ipip_fib_entry_op_gre4_ralue(struct mlxsw_sp *mlxsw_sp, + u32 dip, u8 prefix_len, u16 ul_vr_id, + enum mlxsw_reg_ralue_op op, + u32 tunnel_index) +{ + char ralue_pl[MLXSW_REG_RALUE_LEN]; + + mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_REG_RALXX_PROTOCOL_IPV4, op, + ul_vr_id, prefix_len, dip); + mlxsw_reg_ralue_act_ip2me_tun_pack(ralue_pl, tunnel_index); + return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl); +} + +static int mlxsw_sp_ipip_fib_entry_op_gre4(struct mlxsw_sp *mlxsw_sp, + struct mlxsw_sp_ipip_entry *ipip_entry, + enum mlxsw_reg_ralue_op op, + u32 tunnel_index) +{ + u16 ul_vr_id = mlxsw_sp_ipip_lb_ul_vr_id(ipip_entry->ol_lb); + __be32 dip; + int err; + + err = mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(mlxsw_sp, tunnel_index, + ipip_entry); + if (err) + return err; + + dip = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4, + ipip_entry->ol_dev).addr4; + return mlxsw_sp_ipip_fib_entry_op_gre4_ralue(mlxsw_sp, be32_to_cpu(dip), + 32, ul_vr_id, op, + tunnel_index); +} + +static bool mlxsw_sp_ipip_tunnel_complete(enum mlxsw_sp_l3proto proto, + const struct net_device *ol_dev) +{ + union mlxsw_sp_l3addr saddr = mlxsw_sp_ipip_netdev_saddr(proto, ol_dev); + union mlxsw_sp_l3addr daddr = mlxsw_sp_ipip_netdev_daddr(proto, ol_dev); + union mlxsw_sp_l3addr naddr = {0}; + + /* Tunnels with unset local or remote address are valid in Linux and + * used for lightweight tunnels (LWT) and Non-Broadcast Multi-Access + * (NBMA) tunnels. In principle these can be offloaded, but the driver + * currently doesn't support this. So punt. + */ + return memcmp(&saddr, &naddr, sizeof(naddr)) && + memcmp(&daddr, &naddr, sizeof(naddr)); +} + +static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp, + const struct net_device *ol_dev, + enum mlxsw_sp_l3proto ol_proto) +{ + struct ip_tunnel *tunnel = netdev_priv(ol_dev); + __be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */ + bool inherit_ttl = tunnel->parms.iph.ttl == 0; + bool inherit_tos = tunnel->parms.iph.tos & 0x1; + + return (tunnel->parms.i_flags & ~okflags) == 0 && + (tunnel->parms.o_flags & ~okflags) == 0 && + inherit_ttl && inherit_tos && + mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev); +} + +static struct mlxsw_sp_rif_ipip_lb_config +mlxsw_sp_ipip_ol_loopback_config_gre4(struct mlxsw_sp *mlxsw_sp, + const struct net_device *ol_dev) +{ + enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt; + + lb_ipipt = mlxsw_sp_ipip_netdev_has_okey(ol_dev) ? + MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_KEY_IN_IP : + MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_IN_IP; + return (struct mlxsw_sp_rif_ipip_lb_config){ + .lb_ipipt = lb_ipipt, + .okey = mlxsw_sp_ipip_netdev_okey(ol_dev), + .ul_protocol = MLXSW_SP_L3_PROTO_IPV4, + .saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4, + ol_dev), + }; +} + +static const struct mlxsw_sp_ipip_ops mlxsw_sp_ipip_gre4_ops = { + .dev_type = ARPHRD_IPGRE, + .ul_proto = MLXSW_SP_L3_PROTO_IPV4, + .nexthop_update = mlxsw_sp_ipip_nexthop_update_gre4, + .fib_entry_op = mlxsw_sp_ipip_fib_entry_op_gre4, + .can_offload = mlxsw_sp_ipip_can_offload_gre4, + .ol_loopback_config = mlxsw_sp_ipip_ol_loopback_config_gre4, +}; + +const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = { + [MLXSW_SP_IPIP_TYPE_GRE4] = &mlxsw_sp_ipip_gre4_ops, +}; |