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mlxsw: spectrum_nve: Implement VxLAN operations

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The common NVE core expects each encapsulation type to implement a
certain set of operations that are specific to this type and the
currently used ASIC. These operations include things such as the ability
to determine whether a certain NVE configuration can be offloaded and
ASIC-specific initialization for this type.

Implement these operations for VxLAN on the Spectrum ASIC. Spectrum-2
support will be added by a future patchset.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2018-10-17 08:53:16 +00:00 committed by David S. Miller
parent 6e6030bd54
commit 3695291154
1 changed files with 188 additions and 2 deletions
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190
drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c
View File

@ -3,30 +3,216 @@
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/random.h>
#include <net/vxlan.h>
#include "reg.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
static bool mlxsw_sp1_nve_vxlan_can_offload(const struct mlxsw_sp_nve *nve,
const struct net_device *dev,
struct netlink_ext_ack *extack)
{
return false;
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_LEARN) {
NL_SET_ERR_MSG_MOD(extack, "VxLAN: Learning is not supported");
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_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;
u8 udp_sport;
int err;
err = mlxsw_sp_router_tb_id_vr_id(mlxsw_sp, config->ul_tb_id,
&ul_vr_id);
if (err)
return err;
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_learn_enable_set(tngcr_pl, config->learning_en);
mlxsw_reg_tngcr_underlay_virtual_router_set(tngcr_pl, ul_vr_id);
mlxsw_reg_tngcr_usipv4_set(tngcr_pl, be32_to_cpu(config->ul_sip.addr4));
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)
{
return -EOPNOTSUPP;
struct mlxsw_sp *mlxsw_sp = nve->mlxsw_sp;
int err;
err = mlxsw_sp_nve_parsing_set(mlxsw_sp,
MLXSW_SP_NVE_VXLAN_PARSING_DEPTH,
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_parsing_set(mlxsw_sp, MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH,
config->udp_dport);
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_parsing_set(mlxsw_sp, MLXSW_SP_NVE_DEFAULT_PARSING_DEPTH,
config->udp_dport);
}
const struct mlxsw_sp_nve_ops mlxsw_sp1_nve_vxlan_ops = {