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// SPDX-License-Identifier: GPL-2.0+
#include "lan966x_main.h"
/* 0-8 : 9 port policers */
#define POL_IDX_PORT 0
/* Policer order: Serial (QoS -> Port -> VCAP) */
#define POL_ORDER 0x1d3
struct lan966x_tc_policer {
/* kilobit per second */
u32 rate;
/* bytes */
u32 burst;
};
static int lan966x_police_add(struct lan966x_port *port,
struct lan966x_tc_policer *pol,
u16 pol_idx)
{
struct lan966x *lan966x = port->lan966x;
/* Rate unit is 33 1/3 kpps */
pol->rate = DIV_ROUND_UP(pol->rate * 3, 100);
/* Avoid zero burst size */
pol->burst = pol->burst ?: 1;
/* Unit is 4kB */
pol->burst = DIV_ROUND_UP(pol->burst, 4096);
if (pol->rate > GENMASK(15, 0) ||
pol->burst > GENMASK(6, 0))
return -EINVAL;
lan_wr(ANA_POL_MODE_DROP_ON_YELLOW_ENA_SET(0) |
ANA_POL_MODE_MARK_ALL_FRMS_RED_ENA_SET(0) |
ANA_POL_MODE_IPG_SIZE_SET(20) |
ANA_POL_MODE_FRM_MODE_SET(1) |
ANA_POL_MODE_OVERSHOOT_ENA_SET(1),
lan966x, ANA_POL_MODE(pol_idx));
lan_wr(ANA_POL_PIR_STATE_PIR_LVL_SET(0),
lan966x, ANA_POL_PIR_STATE(pol_idx));
lan_wr(ANA_POL_PIR_CFG_PIR_RATE_SET(pol->rate) |
ANA_POL_PIR_CFG_PIR_BURST_SET(pol->burst),
lan966x, ANA_POL_PIR_CFG(pol_idx));
return 0;
}
static void lan966x_police_del(struct lan966x_port *port, u16 pol_idx)
{
struct lan966x *lan966x = port->lan966x;
lan_wr(ANA_POL_MODE_DROP_ON_YELLOW_ENA_SET(0) |
ANA_POL_MODE_MARK_ALL_FRMS_RED_ENA_SET(0) |
ANA_POL_MODE_IPG_SIZE_SET(20) |
ANA_POL_MODE_FRM_MODE_SET(2) |
ANA_POL_MODE_OVERSHOOT_ENA_SET(1),
lan966x, ANA_POL_MODE(pol_idx));
lan_wr(ANA_POL_PIR_STATE_PIR_LVL_SET(0),
lan966x, ANA_POL_PIR_STATE(pol_idx));
lan_wr(ANA_POL_PIR_CFG_PIR_RATE_SET(GENMASK(14, 0)) |
ANA_POL_PIR_CFG_PIR_BURST_SET(0),
lan966x, ANA_POL_PIR_CFG(pol_idx));
}
static int lan966x_police_validate(struct lan966x_port *port,
const struct flow_action *action,
const struct flow_action_entry *act,
unsigned long police_id,
bool ingress,
struct netlink_ext_ack *extack)
{
if (act->police.exceed.act_id != FLOW_ACTION_DROP) {
NL_SET_ERR_MSG_MOD(extack,
"Offload not supported when exceed action is not drop");
return -EOPNOTSUPP;
}
if (act->police.notexceed.act_id != FLOW_ACTION_PIPE &&
act->police.notexceed.act_id != FLOW_ACTION_ACCEPT) {
NL_SET_ERR_MSG_MOD(extack,
"Offload not supported when conform action is not pipe or ok");
return -EOPNOTSUPP;
}
if (act->police.notexceed.act_id == FLOW_ACTION_ACCEPT &&
!flow_action_is_last_entry(action, act)) {
NL_SET_ERR_MSG_MOD(extack,
"Offload not supported when conform action is ok, but action is not last");
return -EOPNOTSUPP;
}
if (act->police.peakrate_bytes_ps ||
act->police.avrate || act->police.overhead) {
NL_SET_ERR_MSG_MOD(extack,
"Offload not supported when peakrate/avrate/overhead is configured");
return -EOPNOTSUPP;
}
if (act->police.rate_pkt_ps) {
NL_SET_ERR_MSG_MOD(extack,
"QoS offload not support packets per second");
return -EOPNOTSUPP;
}
if (!ingress) {
NL_SET_ERR_MSG_MOD(extack,
"Policer is not supported on egress");
return -EOPNOTSUPP;
}
if (port->tc.ingress_shared_block) {
NL_SET_ERR_MSG_MOD(extack,
"Policer is not supported on shared ingress blocks");
return -EOPNOTSUPP;
}
if (port->tc.police_id && port->tc.police_id != police_id) {
NL_SET_ERR_MSG_MOD(extack,
"Only one policer per port is supported");
return -EEXIST;
}
return 0;
}
int lan966x_police_port_add(struct lan966x_port *port,
struct flow_action *action,
struct flow_action_entry *act,
unsigned long police_id,
bool ingress,
struct netlink_ext_ack *extack)
{
struct lan966x *lan966x = port->lan966x;
struct rtnl_link_stats64 new_stats;
struct lan966x_tc_policer pol;
struct flow_stats *old_stats;
int err;
err = lan966x_police_validate(port, action, act, police_id, ingress,
extack);
if (err)
return err;
memset(&pol, 0, sizeof(pol));
pol.rate = div_u64(act->police.rate_bytes_ps, 1000) * 8;
pol.burst = act->police.burst;
err = lan966x_police_add(port, &pol, POL_IDX_PORT + port->chip_port);
if (err) {
NL_SET_ERR_MSG_MOD(extack,
"Failed to add policer to port");
return err;
}
lan_rmw(ANA_POL_CFG_PORT_POL_ENA_SET(1) |
ANA_POL_CFG_POL_ORDER_SET(POL_ORDER),
ANA_POL_CFG_PORT_POL_ENA |
ANA_POL_CFG_POL_ORDER,
lan966x, ANA_POL_CFG(port->chip_port));
port->tc.police_id = police_id;
/* Setup initial stats */
old_stats = &port->tc.police_stat;
lan966x_stats_get(port->dev, &new_stats);
old_stats->bytes = new_stats.rx_bytes;
old_stats->pkts = new_stats.rx_packets;
old_stats->drops = new_stats.rx_dropped;
old_stats->lastused = jiffies;
return 0;
}
int lan966x_police_port_del(struct lan966x_port *port,
unsigned long police_id,
struct netlink_ext_ack *extack)
{
struct lan966x *lan966x = port->lan966x;
if (port->tc.police_id != police_id) {
NL_SET_ERR_MSG_MOD(extack,
"Invalid policer id");
return -EINVAL;
}
lan966x_police_del(port, POL_IDX_PORT + port->chip_port);
lan_rmw(ANA_POL_CFG_PORT_POL_ENA_SET(0) |
ANA_POL_CFG_POL_ORDER_SET(POL_ORDER),
ANA_POL_CFG_PORT_POL_ENA |
ANA_POL_CFG_POL_ORDER,
lan966x, ANA_POL_CFG(port->chip_port));
port->tc.police_id = 0;
return 0;
}
void lan966x_police_port_stats(struct lan966x_port *port,
struct flow_stats *stats)
{
struct rtnl_link_stats64 new_stats;
struct flow_stats *old_stats;
old_stats = &port->tc.police_stat;
lan966x_stats_get(port->dev, &new_stats);
flow_stats_update(stats,
new_stats.rx_bytes - old_stats->bytes,
new_stats.rx_packets - old_stats->pkts,
new_stats.rx_dropped - old_stats->drops,
old_stats->lastused,
FLOW_ACTION_HW_STATS_IMMEDIATE);
old_stats->bytes = new_stats.rx_bytes;
old_stats->pkts = new_stats.rx_packets;
old_stats->drops = new_stats.rx_dropped;
old_stats->lastused = jiffies;
}
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