/*
* 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,
};
