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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/random.h>
#include <net/vxlan.h>
#include "reg.h"
#include "spectrum.h"
#include "spectrum_nve.h"
/* Eth (18B) | IPv6 (40B) | UDP (8B) | VxLAN (8B) | Eth (14B) | IPv6 (40B)
*
* In the worst case - where we have a VLAN tag on the outer Ethernet
* header and IPv6 in overlay and underlay - we need to parse 128 bytes
*/
#define MLXSW_SP_NVE_VXLAN_PARSING_DEPTH 128
#define MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH 96
#define MLXSW_SP_NVE_VXLAN_SUPPORTED_FLAGS (VXLAN_F_UDP_ZERO_CSUM_TX | \
VXLAN_F_LEARN)
static bool mlxsw_sp_nve_vxlan_can_offload(const struct mlxsw_sp_nve *nve,
const struct net_device *dev,
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_config *cfg = &vxlan->cfg;
if (cfg->saddr.sa.sa_family != AF_INET) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: Only IPv4 underlay is supported");
return false;
}
if (vxlan_addr_multicast(&cfg->remote_ip)) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: Multicast destination IP is not supported");
return false;
}
if (vxlan_addr_any(&cfg->saddr)) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: Source address must be specified");
return false;
}
if (cfg->remote_ifindex) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: Local interface is not supported");
return false;
}
if (cfg->port_min || cfg->port_max) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: Only default UDP source port range is supported");
return false;
}
if (cfg->tos != 1) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: TOS must be configured to inherit");
return false;
}
if (cfg->flags & VXLAN_F_TTL_INHERIT) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: TTL must not be configured to inherit");
return false;
}
if (!(cfg->flags & VXLAN_F_UDP_ZERO_CSUM_TX)) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: UDP checksum is not supported");
return false;
}
if (cfg->flags & ~MLXSW_SP_NVE_VXLAN_SUPPORTED_FLAGS) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: Unsupported flag");
return false;
}
if (cfg->ttl == 0) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: TTL must not be configured to 0");
return false;
}
if (cfg->label != 0) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: Flow label must be configured to 0");
return false;
}
return true;
}
static void mlxsw_sp_nve_vxlan_config(const struct mlxsw_sp_nve *nve,
const struct net_device *dev,
struct mlxsw_sp_nve_config *config)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_config *cfg = &vxlan->cfg;
config->type = MLXSW_SP_NVE_TYPE_VXLAN;
config->ttl = cfg->ttl;
config->flowlabel = cfg->label;
config->learning_en = cfg->flags & VXLAN_F_LEARN ? 1 : 0;
config->ul_tb_id = RT_TABLE_MAIN;
config->ul_proto = MLXSW_SP_L3_PROTO_IPV4;
config->ul_sip.addr4 = cfg->saddr.sin.sin_addr.s_addr;
config->udp_dport = cfg->dst_port;
}
static int __mlxsw_sp_nve_parsing_set(struct mlxsw_sp *mlxsw_sp,
unsigned int parsing_depth,
__be16 udp_dport)
{
char mprs_pl[MLXSW_REG_MPRS_LEN];
mlxsw_reg_mprs_pack(mprs_pl, parsing_depth, be16_to_cpu(udp_dport));
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mprs), mprs_pl);
}
static int mlxsw_sp_nve_parsing_set(struct mlxsw_sp *mlxsw_sp,
__be16 udp_dport)
{
int parsing_depth = mlxsw_sp->nve->inc_parsing_depth_refs ?
MLXSW_SP_NVE_VXLAN_PARSING_DEPTH :
MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH;
return __mlxsw_sp_nve_parsing_set(mlxsw_sp, parsing_depth, udp_dport);
}
static int
__mlxsw_sp_nve_inc_parsing_depth_get(struct mlxsw_sp *mlxsw_sp,
__be16 udp_dport)
{
int err;
mlxsw_sp->nve->inc_parsing_depth_refs++;
err = mlxsw_sp_nve_parsing_set(mlxsw_sp, udp_dport);
if (err)
goto err_nve_parsing_set;
return 0;
err_nve_parsing_set:
mlxsw_sp->nve->inc_parsing_depth_refs--;
return err;
}
static void
__mlxsw_sp_nve_inc_parsing_depth_put(struct mlxsw_sp *mlxsw_sp,
__be16 udp_dport)
{
mlxsw_sp->nve->inc_parsing_depth_refs--;
mlxsw_sp_nve_parsing_set(mlxsw_sp, udp_dport);
}
int mlxsw_sp_nve_inc_parsing_depth_get(struct mlxsw_sp *mlxsw_sp)
{
__be16 udp_dport = mlxsw_sp->nve->config.udp_dport;
return __mlxsw_sp_nve_inc_parsing_depth_get(mlxsw_sp, udp_dport);
}
void mlxsw_sp_nve_inc_parsing_depth_put(struct mlxsw_sp *mlxsw_sp)
{
__be16 udp_dport = mlxsw_sp->nve->config.udp_dport;
__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, udp_dport);
}
static void
mlxsw_sp_nve_vxlan_config_prepare(char *tngcr_pl,
const struct mlxsw_sp_nve_config *config)
{
u8 udp_sport;
mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, true,
config->ttl);
/* VxLAN driver's default UDP source port range is 32768 (0x8000)
* to 60999 (0xee47). Set the upper 8 bits of the UDP source port
* to a random number between 0x80 and 0xee
*/
get_random_bytes(&udp_sport, sizeof(udp_sport));
udp_sport = (udp_sport % (0xee - 0x80 + 1)) + 0x80;
mlxsw_reg_tngcr_nve_udp_sport_prefix_set(tngcr_pl, udp_sport);
mlxsw_reg_tngcr_usipv4_set(tngcr_pl, be32_to_cpu(config->ul_sip.addr4));
}
static int
mlxsw_sp1_nve_vxlan_config_set(struct mlxsw_sp *mlxsw_sp,
const struct mlxsw_sp_nve_config *config)
{
char tngcr_pl[MLXSW_REG_TNGCR_LEN];
u16 ul_vr_id;
int err;
err = mlxsw_sp_router_tb_id_vr_id(mlxsw_sp, config->ul_tb_id,
&ul_vr_id);
if (err)
return err;
mlxsw_sp_nve_vxlan_config_prepare(tngcr_pl, config);
mlxsw_reg_tngcr_learn_enable_set(tngcr_pl, config->learning_en);
mlxsw_reg_tngcr_underlay_virtual_router_set(tngcr_pl, ul_vr_id);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl);
}
static void mlxsw_sp1_nve_vxlan_config_clear(struct mlxsw_sp *mlxsw_sp)
{
char tngcr_pl[MLXSW_REG_TNGCR_LEN];
mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, false, 0);
mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl);
}
static int mlxsw_sp1_nve_vxlan_rtdp_set(struct mlxsw_sp *mlxsw_sp,
unsigned int tunnel_index)
{
char rtdp_pl[MLXSW_REG_RTDP_LEN];
mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_NVE, tunnel_index);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl);
}
static int mlxsw_sp1_nve_vxlan_init(struct mlxsw_sp_nve *nve,
const struct mlxsw_sp_nve_config *config)
{
struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp;
int err;
err = __mlxsw_sp_nve_inc_parsing_depth_get(mlxsw_sp, config->udp_dport);
if (err)
return err;
err = mlxsw_sp1_nve_vxlan_config_set(mlxsw_sp, config);
if (err)
goto err_config_set;
err = mlxsw_sp1_nve_vxlan_rtdp_set(mlxsw_sp, nve->tunnel_index);
if (err)
goto err_rtdp_set;
err = mlxsw_sp_router_nve_promote_decap(mlxsw_sp, config->ul_tb_id,
config->ul_proto,
&config->ul_sip,
nve->tunnel_index);
if (err)
goto err_promote_decap;
return 0;
err_promote_decap:
err_rtdp_set:
mlxsw_sp1_nve_vxlan_config_clear(mlxsw_sp);
err_config_set:
__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, 0);
return err;
}
static void mlxsw_sp1_nve_vxlan_fini(struct mlxsw_sp_nve *nve)
{
struct mlxsw_sp_nve_config *config = &nve->config;
struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp;
mlxsw_sp_router_nve_demote_decap(mlxsw_sp, config->ul_tb_id,
config->ul_proto, &config->ul_sip);
mlxsw_sp1_nve_vxlan_config_clear(mlxsw_sp);
__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, 0);
}
static int
mlxsw_sp_nve_vxlan_fdb_replay(const struct net_device *nve_dev, __be32 vni,
struct netlink_ext_ack *extack)
{
if (WARN_ON(!netif_is_vxlan(nve_dev)))
return -EINVAL;
return vxlan_fdb_replay(nve_dev, vni, &mlxsw_sp_switchdev_notifier,
extack);
}
static void
mlxsw_sp_nve_vxlan_clear_offload(const struct net_device *nve_dev, __be32 vni)
{
if (WARN_ON(!netif_is_vxlan(nve_dev)))
return;
vxlan_fdb_clear_offload(nve_dev, vni);
}
const struct mlxsw_sp_nve_ops mlxsw_sp1_nve_vxlan_ops = {
.type = MLXSW_SP_NVE_TYPE_VXLAN,
.can_offload = mlxsw_sp_nve_vxlan_can_offload,
.nve_config = mlxsw_sp_nve_vxlan_config,
.init = mlxsw_sp1_nve_vxlan_init,
.fini = mlxsw_sp1_nve_vxlan_fini,
.fdb_replay = mlxsw_sp_nve_vxlan_fdb_replay,
.fdb_clear_offload = mlxsw_sp_nve_vxlan_clear_offload,
};
static bool mlxsw_sp2_nve_vxlan_learning_set(struct mlxsw_sp *mlxsw_sp,
bool learning_en)
{
char tnpc_pl[MLXSW_REG_TNPC_LEN];
mlxsw_reg_tnpc_pack(tnpc_pl, MLXSW_REG_TNPC_TUNNEL_PORT_NVE,
learning_en);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tnpc), tnpc_pl);
}
static int
mlxsw_sp2_nve_vxlan_config_set(struct mlxsw_sp *mlxsw_sp,
const struct mlxsw_sp_nve_config *config)
{
char tngcr_pl[MLXSW_REG_TNGCR_LEN];
u16 ul_rif_index;
int err;
err = mlxsw_sp_router_ul_rif_get(mlxsw_sp, config->ul_tb_id,
&ul_rif_index);
if (err)
return err;
mlxsw_sp->nve->ul_rif_index = ul_rif_index;
err = mlxsw_sp2_nve_vxlan_learning_set(mlxsw_sp, config->learning_en);
if (err)
goto err_vxlan_learning_set;
mlxsw_sp_nve_vxlan_config_prepare(tngcr_pl, config);
mlxsw_reg_tngcr_underlay_rif_set(tngcr_pl, ul_rif_index);
err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl);
if (err)
goto err_tngcr_write;
return 0;
err_tngcr_write:
mlxsw_sp2_nve_vxlan_learning_set(mlxsw_sp, false);
err_vxlan_learning_set:
mlxsw_sp_router_ul_rif_put(mlxsw_sp, ul_rif_index);
return err;
}
static void mlxsw_sp2_nve_vxlan_config_clear(struct mlxsw_sp *mlxsw_sp)
{
char tngcr_pl[MLXSW_REG_TNGCR_LEN];
mlxsw_reg_tngcr_pack(tngcr_pl, MLXSW_REG_TNGCR_TYPE_VXLAN, false, 0);
mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(tngcr), tngcr_pl);
mlxsw_sp2_nve_vxlan_learning_set(mlxsw_sp, false);
mlxsw_sp_router_ul_rif_put(mlxsw_sp, mlxsw_sp->nve->ul_rif_index);
}
static int mlxsw_sp2_nve_vxlan_rtdp_set(struct mlxsw_sp *mlxsw_sp,
unsigned int tunnel_index,
u16 ul_rif_index)
{
char rtdp_pl[MLXSW_REG_RTDP_LEN];
mlxsw_reg_rtdp_pack(rtdp_pl, MLXSW_REG_RTDP_TYPE_NVE, tunnel_index);
mlxsw_reg_rtdp_egress_router_interface_set(rtdp_pl, ul_rif_index);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(rtdp), rtdp_pl);
}
static int mlxsw_sp2_nve_vxlan_init(struct mlxsw_sp_nve *nve,
const struct mlxsw_sp_nve_config *config)
{
struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp;
int err;
err = __mlxsw_sp_nve_inc_parsing_depth_get(mlxsw_sp, config->udp_dport);
if (err)
return err;
err = mlxsw_sp2_nve_vxlan_config_set(mlxsw_sp, config);
if (err)
goto err_config_set;
err = mlxsw_sp2_nve_vxlan_rtdp_set(mlxsw_sp, nve->tunnel_index,
nve->ul_rif_index);
if (err)
goto err_rtdp_set;
err = mlxsw_sp_router_nve_promote_decap(mlxsw_sp, config->ul_tb_id,
config->ul_proto,
&config->ul_sip,
nve->tunnel_index);
if (err)
goto err_promote_decap;
return 0;
err_promote_decap:
err_rtdp_set:
mlxsw_sp2_nve_vxlan_config_clear(mlxsw_sp);
err_config_set:
__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, 0);
return err;
}
static void mlxsw_sp2_nve_vxlan_fini(struct mlxsw_sp_nve *nve)
{
struct mlxsw_sp_nve_config *config = &nve->config;
struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp;
mlxsw_sp_router_nve_demote_decap(mlxsw_sp, config->ul_tb_id,
config->ul_proto, &config->ul_sip);
mlxsw_sp2_nve_vxlan_config_clear(mlxsw_sp);
__mlxsw_sp_nve_inc_parsing_depth_put(mlxsw_sp, 0);
}
const struct mlxsw_sp_nve_ops mlxsw_sp2_nve_vxlan_ops = {
.type = MLXSW_SP_NVE_TYPE_VXLAN,
.can_offload = mlxsw_sp_nve_vxlan_can_offload,
.nve_config = mlxsw_sp_nve_vxlan_config,
.init = mlxsw_sp2_nve_vxlan_init,
.fini = mlxsw_sp2_nve_vxlan_fini,
.fdb_replay = mlxsw_sp_nve_vxlan_fdb_replay,
.fdb_clear_offload = mlxsw_sp_nve_vxlan_clear_offload,
};
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