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

   1 /*
   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>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   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.
  17  *
  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.
  21  *
  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
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <net/ip_tunnels.h>
  36
  37 #include "spectrum_ipip.h"
  38
  39 struct ip_tunnel_parm
  40 mlxsw_sp_ipip_netdev_parms(const struct net_device *ol_dev)
  41 {
  42         struct ip_tunnel *tun = netdev_priv(ol_dev);
  43
  44         return tun->parms;
  45 }
  46
  47 static bool mlxsw_sp_ipip_parms_has_ikey(struct ip_tunnel_parm parms)
  48 {
  49         return !!(parms.i_flags & TUNNEL_KEY);
  50 }
  51
  52 static bool mlxsw_sp_ipip_parms_has_okey(struct ip_tunnel_parm parms)
  53 {
  54         return !!(parms.o_flags & TUNNEL_KEY);
  55 }
  56
  57 static u32 mlxsw_sp_ipip_parms_ikey(struct ip_tunnel_parm parms)
  58 {
  59         return mlxsw_sp_ipip_parms_has_ikey(parms) ?
  60                 be32_to_cpu(parms.i_key) : 0;
  61 }
  62
  63 static u32 mlxsw_sp_ipip_parms_okey(struct ip_tunnel_parm parms)
  64 {
  65         return mlxsw_sp_ipip_parms_has_okey(parms) ?
  66                 be32_to_cpu(parms.o_key) : 0;
  67 }
  68
  69 static __be32 mlxsw_sp_ipip_parms_saddr4(struct ip_tunnel_parm parms)
  70 {
  71         return parms.iph.saddr;
  72 }
  73
  74 static union mlxsw_sp_l3addr
  75 mlxsw_sp_ipip_parms_saddr(enum mlxsw_sp_l3proto proto,
  76                           struct ip_tunnel_parm parms)
  77 {
  78         switch (proto) {
  79         case MLXSW_SP_L3_PROTO_IPV4:
  80                 return (union mlxsw_sp_l3addr) {
  81                         .addr4 = mlxsw_sp_ipip_parms_saddr4(parms),
  82                 };
  83         case MLXSW_SP_L3_PROTO_IPV6:
  84                 break;
  85         }
  86
  87         WARN_ON(1);
  88         return (union mlxsw_sp_l3addr) {
  89                 .addr4 = 0,
  90         };
  91 }
  92
  93 static __be32 mlxsw_sp_ipip_parms_daddr4(struct ip_tunnel_parm parms)
  94 {
  95         return parms.iph.daddr;
  96 }
  97
  98 static union mlxsw_sp_l3addr
  99 mlxsw_sp_ipip_parms_daddr(enum mlxsw_sp_l3proto proto,
 100                           struct ip_tunnel_parm parms)
 101 {
 102         switch (proto) {
 103         case MLXSW_SP_L3_PROTO_IPV4:
 104                 return (union mlxsw_sp_l3addr) {
 105                         .addr4 = mlxsw_sp_ipip_parms_daddr4(parms),
 106                 };
 107         case MLXSW_SP_L3_PROTO_IPV6:
 108                 break;
 109         }
 110
 111         WARN_ON(1);
 112         return (union mlxsw_sp_l3addr) {
 113                 .addr4 = 0,
 114         };
 115 }
 116
 117 static bool mlxsw_sp_ipip_netdev_has_ikey(const struct net_device *ol_dev)
 118 {
 119         return mlxsw_sp_ipip_parms_has_ikey(mlxsw_sp_ipip_netdev_parms(ol_dev));
 120 }
 121
 122 static bool mlxsw_sp_ipip_netdev_has_okey(const struct net_device *ol_dev)
 123 {
 124         return mlxsw_sp_ipip_parms_has_okey(mlxsw_sp_ipip_netdev_parms(ol_dev));
 125 }
 126
 127 static u32 mlxsw_sp_ipip_netdev_ikey(const struct net_device *ol_dev)
 128 {
 129         return mlxsw_sp_ipip_parms_ikey(mlxsw_sp_ipip_netdev_parms(ol_dev));
 130 }
 131
 132 static u32 mlxsw_sp_ipip_netdev_okey(const struct net_device *ol_dev)
 133 {
 134         return mlxsw_sp_ipip_parms_okey(mlxsw_sp_ipip_netdev_parms(ol_dev));
 135 }
 136
 137 union mlxsw_sp_l3addr
 138 mlxsw_sp_ipip_netdev_saddr(enum mlxsw_sp_l3proto proto,
 139                            const struct net_device *ol_dev)
 140 {
 141         return mlxsw_sp_ipip_parms_saddr(proto,
 142                                          mlxsw_sp_ipip_netdev_parms(ol_dev));
 143 }
 144
 145 static __be32 mlxsw_sp_ipip_netdev_daddr4(const struct net_device *ol_dev)
 146 {
 147         return mlxsw_sp_ipip_parms_daddr4(mlxsw_sp_ipip_netdev_parms(ol_dev));
 148 }
 149
 150 static union mlxsw_sp_l3addr
 151 mlxsw_sp_ipip_netdev_daddr(enum mlxsw_sp_l3proto proto,
 152                            const struct net_device *ol_dev)
 153 {
 154         return mlxsw_sp_ipip_parms_daddr(proto,
 155                                          mlxsw_sp_ipip_netdev_parms(ol_dev));
 156 }
 157
 158 static int
 159 mlxsw_sp_ipip_nexthop_update_gre4(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
 160                                   struct mlxsw_sp_ipip_entry *ipip_entry)
 161 {
 162         u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
 163         __be32 daddr4 = mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev);
 164         char ratr_pl[MLXSW_REG_RATR_LEN];
 165
 166         mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY,
 167                             true, MLXSW_REG_RATR_TYPE_IPIP,
 168                             adj_index, rif_index);
 169         mlxsw_reg_ratr_ipip4_entry_pack(ratr_pl, be32_to_cpu(daddr4));
 170
 171         return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl);
 172 }
 173
 174 static int
 175 mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(struct mlxsw_sp *mlxsw_sp,
 176                                      u32 tunnel_index,
 177                                      struct mlxsw_sp_ipip_entry *ipip_entry)
 178 {
 179         bool has_ikey = mlxsw_sp_ipip_netdev_has_ikey(ipip_entry->ol_dev);
 180         u16 rif_index = mlxsw_sp_ipip_lb_rif_index(ipip_entry->ol_lb);
 181         u32 ikey = mlxsw_sp_ipip_netdev_ikey(ipip_entry->ol_dev);
 182         char rtdp_pl[MLXSW_REG_RTDP_LEN];
 183         unsigned int type_check;
 184         u32 daddr4;
 185
 186         mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_IPIP, tunnel_index);
 187
 188         type_check = has_ikey ?
 189                 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE_KEY :
 190                 MLXSW_REG_RTDP_IPIP_TYPE_CHECK_ALLOW_GRE;
 191
 192         /* Linux demuxes tunnels based on packet SIP (which must match tunnel
 193          * remote IP). Thus configure decap so that it filters out packets that
 194          * are not IPv4 or have the wrong SIP. IPIP_DECAP_ERROR trap is
 195          * generated for packets that fail this criterion. Linux then handles
 196          * such packets in slow path and generates ICMP destination unreachable.
 197          */
 198         daddr4 = be32_to_cpu(mlxsw_sp_ipip_netdev_daddr4(ipip_entry->ol_dev));
 199         mlxsw_reg_rtdp_ipip4_pack(rtdp_pl, rif_index,
 200                                   MLXSW_REG_RTDP_IPIP_SIP_CHECK_FILTER_IPV4,
 201                                   type_check, has_ikey, daddr4, ikey);
 202
 203         return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl);
 204 }
 205
 206 static int
 207 mlxsw_sp_ipip_fib_entry_op_gre4_ralue(struct mlxsw_sp *mlxsw_sp,
 208                                       u32 dip, u8 prefix_len, u16 ul_vr_id,
 209                                       enum mlxsw_reg_ralue_op op,
 210                                       u32 tunnel_index)
 211 {
 212         char ralue_pl[MLXSW_REG_RALUE_LEN];
 213
 214         mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_REG_RALXX_PROTOCOL_IPV4, op,
 215                               ul_vr_id, prefix_len, dip);
 216         mlxsw_reg_ralue_act_ip2me_tun_pack(ralue_pl, tunnel_index);
 217         return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);
 218 }
 219
 220 static int mlxsw_sp_ipip_fib_entry_op_gre4(struct mlxsw_sp *mlxsw_sp,
 221                                         struct mlxsw_sp_ipip_entry *ipip_entry,
 222                                         enum mlxsw_reg_ralue_op op,
 223                                         u32 tunnel_index)
 224 {
 225         u16 ul_vr_id = mlxsw_sp_ipip_lb_ul_vr_id(ipip_entry->ol_lb);
 226         __be32 dip;
 227         int err;
 228
 229         err = mlxsw_sp_ipip_fib_entry_op_gre4_rtdp(mlxsw_sp, tunnel_index,
 230                                                    ipip_entry);
 231         if (err)
 232                 return err;
 233
 234         dip = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
 235                                          ipip_entry->ol_dev).addr4;
 236         return mlxsw_sp_ipip_fib_entry_op_gre4_ralue(mlxsw_sp, be32_to_cpu(dip),
 237                                                      32, ul_vr_id, op,
 238                                                      tunnel_index);
 239 }
 240
 241 static bool mlxsw_sp_ipip_tunnel_complete(enum mlxsw_sp_l3proto proto,
 242                                           const struct net_device *ol_dev)
 243 {
 244         union mlxsw_sp_l3addr saddr = mlxsw_sp_ipip_netdev_saddr(proto, ol_dev);
 245         union mlxsw_sp_l3addr daddr = mlxsw_sp_ipip_netdev_daddr(proto, ol_dev);
 246         union mlxsw_sp_l3addr naddr = {0};
 247
 248         /* Tunnels with unset local or remote address are valid in Linux and
 249          * used for lightweight tunnels (LWT) and Non-Broadcast Multi-Access
 250          * (NBMA) tunnels. In principle these can be offloaded, but the driver
 251          * currently doesn't support this. So punt.
 252          */
 253         return memcmp(&saddr, &naddr, sizeof(naddr)) &&
 254                memcmp(&daddr, &naddr, sizeof(naddr));
 255 }
 256
 257 static bool mlxsw_sp_ipip_can_offload_gre4(const struct mlxsw_sp *mlxsw_sp,
 258                                            const struct net_device *ol_dev,
 259                                            enum mlxsw_sp_l3proto ol_proto)
 260 {
 261         struct ip_tunnel *tunnel = netdev_priv(ol_dev);
 262         __be16 okflags = TUNNEL_KEY; /* We can't offload any other features. */
 263         bool inherit_ttl = tunnel->parms.iph.ttl == 0;
 264         bool inherit_tos = tunnel->parms.iph.tos & 0x1;
 265
 266         return (tunnel->parms.i_flags & ~okflags) == 0 &&
 267                (tunnel->parms.o_flags & ~okflags) == 0 &&
 268                inherit_ttl && inherit_tos &&
 269                mlxsw_sp_ipip_tunnel_complete(MLXSW_SP_L3_PROTO_IPV4, ol_dev);
 270 }
 271
 272 static struct mlxsw_sp_rif_ipip_lb_config
 273 mlxsw_sp_ipip_ol_loopback_config_gre4(struct mlxsw_sp *mlxsw_sp,
 274                                       const struct net_device *ol_dev)
 275 {
 276         enum mlxsw_reg_ritr_loopback_ipip_type lb_ipipt;
 277
 278         lb_ipipt = mlxsw_sp_ipip_netdev_has_okey(ol_dev) ?
 279                 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_KEY_IN_IP :
 280                 MLXSW_REG_RITR_LOOPBACK_IPIP_TYPE_IP_IN_GRE_IN_IP;
 281         return (struct mlxsw_sp_rif_ipip_lb_config){
 282                 .lb_ipipt = lb_ipipt,
 283                 .okey = mlxsw_sp_ipip_netdev_okey(ol_dev),
 284                 .ul_protocol = MLXSW_SP_L3_PROTO_IPV4,
 285                 .saddr = mlxsw_sp_ipip_netdev_saddr(MLXSW_SP_L3_PROTO_IPV4,
 286                                                     ol_dev),
 287         };
 288 }
 289
 290 static int
 291 mlxsw_sp_ipip_ol_netdev_change_gre4(struct mlxsw_sp *mlxsw_sp,
 292                                     struct mlxsw_sp_ipip_entry *ipip_entry,
 293                                     struct netlink_ext_ack *extack)
 294 {
 295         union mlxsw_sp_l3addr old_saddr, new_saddr;
 296         union mlxsw_sp_l3addr old_daddr, new_daddr;
 297         struct ip_tunnel_parm new_parms;
 298         bool update_tunnel = false;
 299         bool update_decap = false;
 300         bool update_nhs = false;
 301         int err = 0;
 302
 303         new_parms = mlxsw_sp_ipip_netdev_parms(ipip_entry->ol_dev);
 304
 305         new_saddr = mlxsw_sp_ipip_parms_saddr(MLXSW_SP_L3_PROTO_IPV4,
 306                                               new_parms);
 307         old_saddr = mlxsw_sp_ipip_parms_saddr(MLXSW_SP_L3_PROTO_IPV4,
 308                                               ipip_entry->parms);
 309         new_daddr = mlxsw_sp_ipip_parms_daddr(MLXSW_SP_L3_PROTO_IPV4,
 310                                               new_parms);
 311         old_daddr = mlxsw_sp_ipip_parms_daddr(MLXSW_SP_L3_PROTO_IPV4,
 312                                               ipip_entry->parms);
 313
 314         if (!mlxsw_sp_l3addr_eq(&new_saddr, &old_saddr)) {
 315                 u16 ul_tb_id = mlxsw_sp_ipip_dev_ul_tb_id(ipip_entry->ol_dev);
 316
 317                 /* Since the local address has changed, if there is another
 318                  * tunnel with a matching saddr, both need to be demoted.
 319                  */
 320                 if (mlxsw_sp_ipip_demote_tunnel_by_saddr(mlxsw_sp,
 321                                                          MLXSW_SP_L3_PROTO_IPV4,
 322                                                          new_saddr, ul_tb_id,
 323                                                          ipip_entry)) {
 324                         mlxsw_sp_ipip_entry_demote_tunnel(mlxsw_sp, ipip_entry);
 325                         return 0;
 326                 }
 327
 328                 update_tunnel = true;
 329         } else if ((mlxsw_sp_ipip_parms_okey(ipip_entry->parms) !=
 330                     mlxsw_sp_ipip_parms_okey(new_parms)) ||
 331                    ipip_entry->parms.link != new_parms.link) {
 332                 update_tunnel = true;
 333         } else if (!mlxsw_sp_l3addr_eq(&new_daddr, &old_daddr)) {
 334                 update_nhs = true;
 335         } else if (mlxsw_sp_ipip_parms_ikey(ipip_entry->parms) !=
 336                    mlxsw_sp_ipip_parms_ikey(new_parms)) {
 337                 update_decap = true;
 338         }
 339
 340         if (update_tunnel)
 341                 err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 342                                                           true, true, true,
 343                                                           extack);
 344         else if (update_nhs)
 345                 err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 346                                                           false, false, true,
 347                                                           extack);
 348         else if (update_decap)
 349                 err = __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 350                                                           false, false, false,
 351                                                           extack);
 352
 353         ipip_entry->parms = new_parms;
 354         return err;
 355 }
 356
 357 static const struct mlxsw_sp_ipip_ops mlxsw_sp_ipip_gre4_ops = {
 358         .dev_type = ARPHRD_IPGRE,
 359         .ul_proto = MLXSW_SP_L3_PROTO_IPV4,
 360         .nexthop_update = mlxsw_sp_ipip_nexthop_update_gre4,
 361         .fib_entry_op = mlxsw_sp_ipip_fib_entry_op_gre4,
 362         .can_offload = mlxsw_sp_ipip_can_offload_gre4,
 363         .ol_loopback_config = mlxsw_sp_ipip_ol_loopback_config_gre4,
 364         .ol_netdev_change = mlxsw_sp_ipip_ol_netdev_change_gre4,
 365 };
 366
 367 const struct mlxsw_sp_ipip_ops *mlxsw_sp_ipip_ops_arr[] = {
 368         [MLXSW_SP_IPIP_TYPE_GRE4] = &mlxsw_sp_ipip_gre4_ops,
 369 };