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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2017-2020 Mellanox Technologies. All rights reserved */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <net/flow_offload.h>
#include "spectrum.h"
#include "spectrum_span.h"
#include "reg.h"
enum mlxsw_sp_mall_action_type {
MLXSW_SP_MALL_ACTION_TYPE_MIRROR,
MLXSW_SP_MALL_ACTION_TYPE_SAMPLE,
};
struct mlxsw_sp_mall_mirror_entry {
int span_id;
bool ingress;
};
struct mlxsw_sp_mall_entry {
struct list_head list;
unsigned long cookie;
enum mlxsw_sp_mall_action_type type;
union {
struct mlxsw_sp_mall_mirror_entry mirror;
};
};
static struct mlxsw_sp_mall_entry *
mlxsw_sp_mall_entry_find(struct mlxsw_sp_port *port, unsigned long cookie)
{
struct mlxsw_sp_mall_entry *mall_entry;
list_for_each_entry(mall_entry, &port->mall_list, list)
if (mall_entry->cookie == cookie)
return mall_entry;
return NULL;
}
static int
mlxsw_sp_mall_port_mirror_add(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_mall_mirror_entry *mirror,
const struct flow_action_entry *act,
bool ingress)
{
enum mlxsw_sp_span_type span_type;
if (!act->dev) {
netdev_err(mlxsw_sp_port->dev, "Could not find requested device\n");
return -EINVAL;
}
mirror->ingress = ingress;
span_type = ingress ? MLXSW_SP_SPAN_INGRESS : MLXSW_SP_SPAN_EGRESS;
return mlxsw_sp_span_mirror_add(mlxsw_sp_port, act->dev, span_type,
true, &mirror->span_id);
}
static void
mlxsw_sp_mall_port_mirror_del(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_mall_mirror_entry *mirror)
{
enum mlxsw_sp_span_type span_type;
span_type = mirror->ingress ? MLXSW_SP_SPAN_INGRESS :
MLXSW_SP_SPAN_EGRESS;
mlxsw_sp_span_mirror_del(mlxsw_sp_port, mirror->span_id,
span_type, true);
}
static int mlxsw_sp_mall_port_sample_set(struct mlxsw_sp_port *mlxsw_sp_port,
bool enable, u32 rate)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
char mpsc_pl[MLXSW_REG_MPSC_LEN];
mlxsw_reg_mpsc_pack(mpsc_pl, mlxsw_sp_port->local_port, enable, rate);
return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(mpsc), mpsc_pl);
}
static int
mlxsw_sp_mall_port_sample_add(struct mlxsw_sp_port *mlxsw_sp_port,
struct tc_cls_matchall_offload *cls,
const struct flow_action_entry *act, bool ingress)
{
int err;
if (!mlxsw_sp_port->sample)
return -EOPNOTSUPP;
if (rtnl_dereference(mlxsw_sp_port->sample->psample_group)) {
netdev_err(mlxsw_sp_port->dev, "sample already active\n");
return -EEXIST;
}
if (act->sample.rate > MLXSW_REG_MPSC_RATE_MAX) {
netdev_err(mlxsw_sp_port->dev, "sample rate not supported\n");
return -EOPNOTSUPP;
}
rcu_assign_pointer(mlxsw_sp_port->sample->psample_group,
act->sample.psample_group);
mlxsw_sp_port->sample->truncate = act->sample.truncate;
mlxsw_sp_port->sample->trunc_size = act->sample.trunc_size;
mlxsw_sp_port->sample->rate = act->sample.rate;
err = mlxsw_sp_mall_port_sample_set(mlxsw_sp_port, true,
act->sample.rate);
if (err)
goto err_port_sample_set;
return 0;
err_port_sample_set:
RCU_INIT_POINTER(mlxsw_sp_port->sample->psample_group, NULL);
return err;
}
static void
mlxsw_sp_mall_port_sample_del(struct mlxsw_sp_port *mlxsw_sp_port)
{
if (!mlxsw_sp_port->sample)
return;
mlxsw_sp_mall_port_sample_set(mlxsw_sp_port, false, 1);
RCU_INIT_POINTER(mlxsw_sp_port->sample->psample_group, NULL);
}
int mlxsw_sp_mall_replace(struct mlxsw_sp_port *mlxsw_sp_port,
struct tc_cls_matchall_offload *f, bool ingress)
{
struct mlxsw_sp_mall_entry *mall_entry;
__be16 protocol = f->common.protocol;
struct flow_action_entry *act;
int err;
if (!flow_offload_has_one_action(&f->rule->action)) {
netdev_err(mlxsw_sp_port->dev, "only singular actions are supported\n");
return -EOPNOTSUPP;
}
mall_entry = kzalloc(sizeof(*mall_entry), GFP_KERNEL);
if (!mall_entry)
return -ENOMEM;
mall_entry->cookie = f->cookie;
act = &f->rule->action.entries[0];
if (act->id == FLOW_ACTION_MIRRED && protocol == htons(ETH_P_ALL)) {
struct mlxsw_sp_mall_mirror_entry *mirror;
mall_entry->type = MLXSW_SP_MALL_ACTION_TYPE_MIRROR;
mirror = &mall_entry->mirror;
err = mlxsw_sp_mall_port_mirror_add(mlxsw_sp_port, mirror, act,
ingress);
} else if (act->id == FLOW_ACTION_SAMPLE &&
protocol == htons(ETH_P_ALL)) {
mall_entry->type = MLXSW_SP_MALL_ACTION_TYPE_SAMPLE;
err = mlxsw_sp_mall_port_sample_add(mlxsw_sp_port, f, act,
ingress);
} else {
err = -EOPNOTSUPP;
}
if (err)
goto err_add_action;
list_add_tail(&mall_entry->list, &mlxsw_sp_port->mall_list);
return 0;
err_add_action:
kfree(mall_entry);
return err;
}
void mlxsw_sp_mall_destroy(struct mlxsw_sp_port *mlxsw_sp_port,
struct tc_cls_matchall_offload *f)
{
struct mlxsw_sp_mall_entry *mall_entry;
mall_entry = mlxsw_sp_mall_entry_find(mlxsw_sp_port, f->cookie);
if (!mall_entry) {
netdev_dbg(mlxsw_sp_port->dev, "tc entry not found on port\n");
return;
}
list_del(&mall_entry->list);
switch (mall_entry->type) {
case MLXSW_SP_MALL_ACTION_TYPE_MIRROR:
mlxsw_sp_mall_port_mirror_del(mlxsw_sp_port,
&mall_entry->mirror);
break;
case MLXSW_SP_MALL_ACTION_TYPE_SAMPLE:
mlxsw_sp_mall_port_sample_del(mlxsw_sp_port);
break;
default:
WARN_ON(1);
}
kfree(mall_entry);
}
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