2 * drivers/net/ethernet/mellanox/mlxsw/spectrum_ipip.c
3 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.
4 * Copyright (c) 2017 Petr Machata <petrm@mellanox.com>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the names of the copyright holders nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
18 * Alternatively, this software may be distributed under the terms of the
19 * GNU General Public License ("GPL") version 2 as published by the Free
20 * Software Foundation.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
35 #include <net/ip_tunnels.h>
37 #include "spectrum_ipip.h"
40 mlxsw_sp_ipip_netdev_has_ikey(const struct net_device *ol_dev)
42 struct ip_tunnel *tun = netdev_priv(ol_dev);
44 return !!(tun->parms.i_flags & TUNNEL_KEY);
48 mlxsw_sp_ipip_netdev_has_okey(const struct net_device *ol_dev)
50 struct ip_tunnel *tun = netdev_priv(ol_dev);
52 return !!(tun->parms.o_flags & TUNNEL_KEY);
55 static u32 mlxsw_sp_ipip_netdev_ikey(const struct net_device *ol_dev)
57 struct ip_tunnel *tun = netdev_priv(ol_dev);
59 return mlxsw_sp_ipip_netdev_has_ikey(ol_dev) ?
60 be32_to_cpu(tun->parms.i_key) : 0;
63 static u32 mlxsw_sp_ipip_netdev_okey(const struct net_device *ol_dev)
65 struct ip_tunnel *tun = netdev_priv(ol_dev);
67 return mlxsw_sp_ipip_netdev_has_okey(ol_dev) ?
68 be32_to_cpu(tun->parms.o_key) : 0;
72 mlxsw_sp_ipip_nexthop_update_gre4(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
73 struct mlxsw_sp_ipip_entry *ipip_entry)
75 u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
76 __be32 daddr4 = mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev);
77 char ratr_pl[MLXSW_REG_RATR_LEN];
79 mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY,
80 true, MLXSW_REG_RATR_TYPE_IPIP,
81 adj_index, rif_index);
82 mlxsw_reg_ratr_ipip4_entry_pack(ratr_pl, be32_to_cpu(daddr4));
84 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl);
88 mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp,
90 struct mlxsw_sp_ipip_entry *ipip_entry)
92 bool has_ikey = mlxsw_sp_ipip_netdev_has_ikey(ipip_entry->ol_dev);
93 u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
94 u32 ikey = mlxsw_sp_ipip_netdev_ikey(ipip_entry->ol_dev);
95 char rtdp_pl[MLXSW_REG_RTDP_LEN];
96 unsigned int type_check;
99 mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_IPIP, tunnel_index);
101 type_check = has_ikey ?
102 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY :
103 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE;
105 /* Linux demuxes tunnels based on packet SIP (which must match tunnel
106 * remote IP). Thus configure decap so that it filters out packets that
107 * are not IPv4 or have the wrong SIP. IPIP_DECAP_ERROR trap is
108 * generated for packets that fail this criterion. Linux then handles
109 * such packets in slow path and generates ICMP destination unreachable.
111 daddr4 = be32_to_cpu(mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev));
112 mlxsw_reg_rtdp_ipip4_pack(rtdp_pl, rif_index,
113 MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4,
114 type_check, has_ikey, daddr4, ikey);
116 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl);
120 mlxsw_sp_ipip_fib_entry_op_gre4_ralue(struct mlxsw_sp *mlxsw_sp,
121 u32 dip, u8 prefix_len, u16 ul_vr_id,
122 enum mlxsw_reg_ralue_op op,
125 char ralue_pl[MLXSW_REG_RALUE_LEN];
127 mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_REG_RALXX_PROTOCOL_IPV4, op,
128 ul_vr_id, prefix_len, dip);
129 mlxsw_reg_ralue_act_ip2me_tun_pack(ralue_pl, tunnel_index);
130 return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);
133 static int mlxsw_sp_ipip_fib_entry_op_gre4(struct mlxsw_sp *mlxsw_sp,
134 struct mlxsw_sp_ipip_entry *ipip_entry,
135 enum mlxsw_reg_ralue_op op,
138 u16 ul_vr_id = mlxsw_sp_ipip_lb_ul_vr_id(ipip_entry->ol_lb);
142 err = mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(mlxsw_sp, tunnel_index,
147 dip = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
148 ipip_entry->ol_dev).addr4;
149 return mlxsw_sp_ipip_fib_entry_op_gre4_ralue(mlxsw_sp, be32_to_cpu(dip),
154 static bool mlxsw_sp_ipip_tunnel_complete(enum mlxsw_sp_l3proto proto,
155 const struct net_device *ol_dev)
157 union mlxsw_sp_l3addr saddr = mlxsw_sp_ipip_netdev_saddr(proto, ol_dev);
158 union mlxsw_sp_l3addr daddr = mlxsw_sp_ipip_netdev_daddr(proto, ol_dev);
159 union mlxsw_sp_l3addr naddr = {0};
161 /* Tunnels with unset local or remote address are valid in Linux and
162 * used for lightweight tunnels (LWT) and Non-Broadcast Multi-Access
163 * (NBMA) tunnels. In principle these can be offloaded, but the driver
164 * currently doesn't support this. So punt.
166 return memcmp(&saddr, &naddr, sizeof(naddr)) &&
167 memcmp(&daddr, &naddr, sizeof(naddr));
170 static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp,
171 const struct net_device *ol_dev,
172 enum mlxsw_sp_l3proto ol_proto)
174 struct ip_tunnel *tunnel = netdev_priv(ol_dev);
175 __be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */
176 bool inherit_ttl = tunnel->parms.iph.ttl == 0;
177 bool inherit_tos = tunnel->parms.iph.tos & 0x1;
179 return (tunnel->parms.i_flags & ~okflags) == 0 &&
180 (tunnel->parms.o_flags & ~okflags) == 0 &&
181 inherit_ttl && inherit_tos &&
182 mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev);
185 static struct mlxsw_sp_rif_ipip_lb_config
186 mlxsw_sp_ipip_ol_loopback_config_gre4(struct mlxsw_sp *mlxsw_sp,
187 const struct net_device *ol_dev)
189 enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt;
191 lb_ipipt = mlxsw_sp_ipip_netdev_has_okey(ol_dev) ?
192 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_KEY_IN_IP :
193 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_IN_IP;
194 return (struct mlxsw_sp_rif_ipip_lb_config){
195 .lb_ipipt = lb_ipipt,
196 .okey = mlxsw_sp_ipip_netdev_okey(ol_dev),
197 .ul_protocol = MLXSW_SP_L3_PROTO_IPV4,
198 .saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
203 static const struct mlxsw_sp_ipip_ops mlxsw_sp_ipip_gre4_ops = {
204 .dev_type = ARPHRD_IPGRE,
205 .ul_proto = MLXSW_SP_L3_PROTO_IPV4,
206 .nexthop_update = mlxsw_sp_ipip_nexthop_update_gre4,
207 .fib_entry_op = mlxsw_sp_ipip_fib_entry_op_gre4,
208 .can_offload = mlxsw_sp_ipip_can_offload_gre4,
209 .ol_loopback_config = mlxsw_sp_ipip_ol_loopback_config_gre4,
212 const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = {
213 [MLXSW_SP_IPIP_TYPE_GRE4] = &mlxsw_sp_ipip_gre4_ops,