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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2019 Mellanox Technologies. All rights reserved */
#include <linux/kernel.h>
#include <net/devlink.h>
#include <uapi/linux/devlink.h>
#include "core.h"
#include "reg.h"
#include "spectrum.h"
#define MLXSW_SP_TRAP_METADATA DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT
static void mlxsw_sp_rx_drop_listener(struct sk_buff *skb, u8 local_port,
void *priv);
#define MLXSW_SP_TRAP_DROP(_id, _group_id) \
DEVLINK_TRAP_GENERIC(DROP, DROP, _id, \
DEVLINK_TRAP_GROUP_GENERIC(_group_id), \
MLXSW_SP_TRAP_METADATA)
#define MLXSW_SP_RXL_DISCARD(_id, _group_id) \
MLXSW_RXL(mlxsw_sp_rx_drop_listener, DISCARD_##_id, SET_FW_DEFAULT, \
false, SP_##_group_id, DISCARD)
static struct devlink_trap mlxsw_sp_traps_arr[] = {
MLXSW_SP_TRAP_DROP(SMAC_MC, L2_DROPS),
MLXSW_SP_TRAP_DROP(VLAN_TAG_MISMATCH, L2_DROPS),
MLXSW_SP_TRAP_DROP(INGRESS_VLAN_FILTER, L2_DROPS),
MLXSW_SP_TRAP_DROP(INGRESS_STP_FILTER, L2_DROPS),
MLXSW_SP_TRAP_DROP(EMPTY_TX_LIST, L2_DROPS),
MLXSW_SP_TRAP_DROP(PORT_LOOPBACK_FILTER, L2_DROPS),
};
static struct mlxsw_listener mlxsw_sp_listeners_arr[] = {
MLXSW_SP_RXL_DISCARD(ING_PACKET_SMAC_MC, L2_DISCARDS),
MLXSW_SP_RXL_DISCARD(ING_SWITCH_VTAG_ALLOW, L2_DISCARDS),
MLXSW_SP_RXL_DISCARD(ING_SWITCH_VLAN, L2_DISCARDS),
MLXSW_SP_RXL_DISCARD(ING_SWITCH_STP, L2_DISCARDS),
MLXSW_SP_RXL_DISCARD(LOOKUP_SWITCH_UC, L2_DISCARDS),
MLXSW_SP_RXL_DISCARD(LOOKUP_SWITCH_MC_NULL, L2_DISCARDS),
MLXSW_SP_RXL_DISCARD(LOOKUP_SWITCH_LB, L2_DISCARDS),
};
/* Mapping between hardware trap and devlink trap. Multiple hardware traps can
* be mapped to the same devlink trap. Order is according to
* 'mlxsw_sp_listeners_arr'.
*/
static u16 mlxsw_sp_listener_devlink_map[] = {
DEVLINK_TRAP_GENERIC_ID_SMAC_MC,
DEVLINK_TRAP_GENERIC_ID_VLAN_TAG_MISMATCH,
DEVLINK_TRAP_GENERIC_ID_INGRESS_VLAN_FILTER,
DEVLINK_TRAP_GENERIC_ID_INGRESS_STP_FILTER,
DEVLINK_TRAP_GENERIC_ID_EMPTY_TX_LIST,
DEVLINK_TRAP_GENERIC_ID_EMPTY_TX_LIST,
DEVLINK_TRAP_GENERIC_ID_PORT_LOOPBACK_FILTER,
};
static int mlxsw_sp_rx_listener(struct mlxsw_sp *mlxsw_sp, struct sk_buff *skb,
u8 local_port,
struct mlxsw_sp_port *mlxsw_sp_port)
{
struct mlxsw_sp_port_pcpu_stats *pcpu_stats;
if (unlikely(!mlxsw_sp_port)) {
dev_warn_ratelimited(mlxsw_sp->bus_info->dev, "Port %d: skb received for non-existent port\n",
local_port);
kfree_skb(skb);
return -EINVAL;
}
skb->dev = mlxsw_sp_port->dev;
pcpu_stats = this_cpu_ptr(mlxsw_sp_port->pcpu_stats);
u64_stats_update_begin(&pcpu_stats->syncp);
pcpu_stats->rx_packets++;
pcpu_stats->rx_bytes += skb->len;
u64_stats_update_end(&pcpu_stats->syncp);
skb->protocol = eth_type_trans(skb, skb->dev);
return 0;
}
static void mlxsw_sp_rx_drop_listener(struct sk_buff *skb, u8 local_port,
void *trap_ctx)
{
struct devlink_port *in_devlink_port;
struct mlxsw_sp_port *mlxsw_sp_port;
struct mlxsw_sp *mlxsw_sp;
struct devlink *devlink;
mlxsw_sp = devlink_trap_ctx_priv(trap_ctx);
mlxsw_sp_port = mlxsw_sp->ports[local_port];
if (mlxsw_sp_rx_listener(mlxsw_sp, skb, local_port, mlxsw_sp_port))
return;
devlink = priv_to_devlink(mlxsw_sp->core);
in_devlink_port = mlxsw_core_port_devlink_port_get(mlxsw_sp->core,
local_port);
skb_push(skb, ETH_HLEN);
devlink_trap_report(devlink, skb, trap_ctx, in_devlink_port);
consume_skb(skb);
}
int mlxsw_sp_devlink_traps_init(struct mlxsw_sp *mlxsw_sp)
{
struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
if (WARN_ON(ARRAY_SIZE(mlxsw_sp_listener_devlink_map) !=
ARRAY_SIZE(mlxsw_sp_listeners_arr)))
return -EINVAL;
return devlink_traps_register(devlink, mlxsw_sp_traps_arr,
ARRAY_SIZE(mlxsw_sp_traps_arr),
mlxsw_sp);
}
void mlxsw_sp_devlink_traps_fini(struct mlxsw_sp *mlxsw_sp)
{
struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
devlink_traps_unregister(devlink, mlxsw_sp_traps_arr,
ARRAY_SIZE(mlxsw_sp_traps_arr));
}
int mlxsw_sp_trap_init(struct mlxsw_core *mlxsw_core,
const struct devlink_trap *trap, void *trap_ctx)
{
int i;
for (i = 0; i < ARRAY_SIZE(mlxsw_sp_listener_devlink_map); i++) {
struct mlxsw_listener *listener;
int err;
if (mlxsw_sp_listener_devlink_map[i] != trap->id)
continue;
listener = &mlxsw_sp_listeners_arr[i];
err = mlxsw_core_trap_register(mlxsw_core, listener, trap_ctx);
if (err)
return err;
}
return 0;
}
void mlxsw_sp_trap_fini(struct mlxsw_core *mlxsw_core,
const struct devlink_trap *trap, void *trap_ctx)
{
int i;
for (i = 0; i < ARRAY_SIZE(mlxsw_sp_listener_devlink_map); i++) {
struct mlxsw_listener *listener;
if (mlxsw_sp_listener_devlink_map[i] != trap->id)
continue;
listener = &mlxsw_sp_listeners_arr[i];
mlxsw_core_trap_unregister(mlxsw_core, listener, trap_ctx);
}
}
int mlxsw_sp_trap_action_set(struct mlxsw_core *mlxsw_core,
const struct devlink_trap *trap,
enum devlink_trap_action action)
{
int i;
for (i = 0; i < ARRAY_SIZE(mlxsw_sp_listener_devlink_map); i++) {
enum mlxsw_reg_hpkt_action hw_action;
struct mlxsw_listener *listener;
int err;
if (mlxsw_sp_listener_devlink_map[i] != trap->id)
continue;
listener = &mlxsw_sp_listeners_arr[i];
switch (action) {
case DEVLINK_TRAP_ACTION_DROP:
hw_action = MLXSW_REG_HPKT_ACTION_SET_FW_DEFAULT;
break;
case DEVLINK_TRAP_ACTION_TRAP:
hw_action = MLXSW_REG_HPKT_ACTION_TRAP_EXCEPTION_TO_CPU;
break;
default:
return -EINVAL;
}
err = mlxsw_core_trap_action_set(mlxsw_core, listener,
hw_action);
if (err)
return err;
}
return 0;
}
#define MLXSW_SP_DISCARD_POLICER_ID (MLXSW_REG_HTGT_TRAP_GROUP_MAX + 1)
static int
mlxsw_sp_trap_group_policer_init(struct mlxsw_sp *mlxsw_sp,
const struct devlink_trap_group *group)
{
enum mlxsw_reg_qpcr_ir_units ir_units;
char qpcr_pl[MLXSW_REG_QPCR_LEN];
u16 policer_id;
u8 burst_size;
bool is_bytes;
u32 rate;
switch (group->id) {
case DEVLINK_TRAP_GROUP_GENERIC_ID_L2_DROPS:
policer_id = MLXSW_SP_DISCARD_POLICER_ID;
ir_units = MLXSW_REG_QPCR_IR_UNITS_M;
is_bytes = false;
rate = 10 * 1024; /* 10Kpps */
burst_size = 7;
break;
default:
return -EINVAL;
}
mlxsw_reg_qpcr_pack(qpcr_pl, policer_id, ir_units, is_bytes, rate,
burst_size);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(qpcr), qpcr_pl);
}
static int
__mlxsw_sp_trap_group_init(struct mlxsw_sp *mlxsw_sp,
const struct devlink_trap_group *group)
{
char htgt_pl[MLXSW_REG_HTGT_LEN];
u8 priority, tc, group_id;
u16 policer_id;
switch (group->id) {
case DEVLINK_TRAP_GROUP_GENERIC_ID_L2_DROPS:
group_id = MLXSW_REG_HTGT_TRAP_GROUP_SP_L2_DISCARDS;
policer_id = MLXSW_SP_DISCARD_POLICER_ID;
priority = 0;
tc = 1;
break;
default:
return -EINVAL;
}
mlxsw_reg_htgt_pack(htgt_pl, group_id, policer_id, priority, tc);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(htgt), htgt_pl);
}
int mlxsw_sp_trap_group_init(struct mlxsw_core *mlxsw_core,
const struct devlink_trap_group *group)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
int err;
err = mlxsw_sp_trap_group_policer_init(mlxsw_sp, group);
if (err)
return err;
err = __mlxsw_sp_trap_group_init(mlxsw_sp, group);
if (err)
return err;
return 0;
}
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