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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 {
const struct net_device *to_dev;
int span_id;
};
struct mlxsw_sp_mall_entry {
struct list_head list;
unsigned long cookie;
enum mlxsw_sp_mall_action_type type;
bool ingress;
union {
struct mlxsw_sp_mall_mirror_entry mirror;
struct mlxsw_sp_port_sample sample;
};
struct rcu_head rcu;
};
static struct mlxsw_sp_mall_entry *
mlxsw_sp_mall_entry_find(struct mlxsw_sp_flow_block *block, unsigned long cookie)
{
struct mlxsw_sp_mall_entry *mall_entry;
list_for_each_entry(mall_entry, &block->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_entry *mall_entry)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
struct mlxsw_sp_span_trigger_parms parms;
enum mlxsw_sp_span_trigger trigger;
int err;
if (!mall_entry->mirror.to_dev) {
netdev_err(mlxsw_sp_port->dev, "Could not find requested device\n");
return -EINVAL;
}
err = mlxsw_sp_span_agent_get(mlxsw_sp, mall_entry->mirror.to_dev,
&mall_entry->mirror.span_id);
if (err)
return err;
err = mlxsw_sp_span_analyzed_port_get(mlxsw_sp_port,
mall_entry->ingress);
if (err)
goto err_analyzed_port_get;
trigger = mall_entry->ingress ? MLXSW_SP_SPAN_TRIGGER_INGRESS :
MLXSW_SP_SPAN_TRIGGER_EGRESS;
parms.span_id = mall_entry->mirror.span_id;
err = mlxsw_sp_span_agent_bind(mlxsw_sp, trigger, mlxsw_sp_port,
&parms);
if (err)
goto err_agent_bind;
return 0;
err_agent_bind:
mlxsw_sp_span_analyzed_port_put(mlxsw_sp_port, mall_entry->ingress);
err_analyzed_port_get:
mlxsw_sp_span_agent_put(mlxsw_sp, mall_entry->mirror.span_id);
return err;
}
static void
mlxsw_sp_mall_port_mirror_del(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_mall_entry *mall_entry)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
struct mlxsw_sp_span_trigger_parms parms;
enum mlxsw_sp_span_trigger trigger;
trigger = mall_entry->ingress ? MLXSW_SP_SPAN_TRIGGER_INGRESS :
MLXSW_SP_SPAN_TRIGGER_EGRESS;
parms.span_id = mall_entry->mirror.span_id;
mlxsw_sp_span_agent_unbind(mlxsw_sp, trigger, mlxsw_sp_port, &parms);
mlxsw_sp_span_analyzed_port_put(mlxsw_sp_port, mall_entry->ingress);
mlxsw_sp_span_agent_put(mlxsw_sp, mall_entry->mirror.span_id);
}
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 mlxsw_sp_mall_entry *mall_entry)
{
int err;
if (rtnl_dereference(mlxsw_sp_port->sample)) {
netdev_err(mlxsw_sp_port->dev, "sample already active\n");
return -EEXIST;
}
rcu_assign_pointer(mlxsw_sp_port->sample, &mall_entry->sample);
err = mlxsw_sp_mall_port_sample_set(mlxsw_sp_port, true,
mall_entry->sample.rate);
if (err)
goto err_port_sample_set;
return 0;
err_port_sample_set:
RCU_INIT_POINTER(mlxsw_sp_port->sample, 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, NULL);
}
static int
mlxsw_sp_mall_port_rule_add(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_mall_entry *mall_entry)
{
switch (mall_entry->type) {
case MLXSW_SP_MALL_ACTION_TYPE_MIRROR:
return mlxsw_sp_mall_port_mirror_add(mlxsw_sp_port, mall_entry);
case MLXSW_SP_MALL_ACTION_TYPE_SAMPLE:
return mlxsw_sp_mall_port_sample_add(mlxsw_sp_port, mall_entry);
default:
WARN_ON(1);
return -EINVAL;
}
}
static void
mlxsw_sp_mall_port_rule_del(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp_mall_entry *mall_entry)
{
switch (mall_entry->type) {
case MLXSW_SP_MALL_ACTION_TYPE_MIRROR:
mlxsw_sp_mall_port_mirror_del(mlxsw_sp_port, mall_entry);
break;
case MLXSW_SP_MALL_ACTION_TYPE_SAMPLE:
mlxsw_sp_mall_port_sample_del(mlxsw_sp_port);
break;
default:
WARN_ON(1);
}
}
int mlxsw_sp_mall_replace(struct mlxsw_sp_flow_block *block,
struct tc_cls_matchall_offload *f)
{
struct mlxsw_sp_flow_block_binding *binding;
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)) {
NL_SET_ERR_MSG(f->common.extack, "Only singular actions are supported");
return -EOPNOTSUPP;
}
if (f->common.chain_index) {
NL_SET_ERR_MSG(f->common.extack, "Only chain 0 is supported");
return -EOPNOTSUPP;
}
if (mlxsw_sp_flow_block_is_mixed_bound(block)) {
NL_SET_ERR_MSG(f->common.extack, "Only not mixed bound blocks are supported");
return -EOPNOTSUPP;
}
mall_entry = kzalloc(sizeof(*mall_entry), GFP_KERNEL);
if (!mall_entry)
return -ENOMEM;
mall_entry->cookie = f->cookie;
mall_entry->ingress = mlxsw_sp_flow_block_is_ingress_bound(block);
act = &f->rule->action.entries[0];
if (act->id == FLOW_ACTION_MIRRED && protocol == htons(ETH_P_ALL)) {
mall_entry->type = MLXSW_SP_MALL_ACTION_TYPE_MIRROR;
mall_entry->mirror.to_dev = act->dev;
} else if (act->id == FLOW_ACTION_SAMPLE &&
protocol == htons(ETH_P_ALL)) {
if (act->sample.rate > MLXSW_REG_MPSC_RATE_MAX) {
NL_SET_ERR_MSG(f->common.extack, "Sample rate not supported");
err = -EOPNOTSUPP;
goto errout;
}
mall_entry->type = MLXSW_SP_MALL_ACTION_TYPE_SAMPLE;
mall_entry->sample.psample_group = act->sample.psample_group;
mall_entry->sample.truncate = act->sample.truncate;
mall_entry->sample.trunc_size = act->sample.trunc_size;
mall_entry->sample.rate = act->sample.rate;
} else {
err = -EOPNOTSUPP;
goto errout;
}
list_for_each_entry(binding, &block->binding_list, list) {
err = mlxsw_sp_mall_port_rule_add(binding->mlxsw_sp_port,
mall_entry);
if (err)
goto rollback;
}
block->rule_count++;
if (mall_entry->ingress)
block->egress_blocker_rule_count++;
else
block->ingress_blocker_rule_count++;
list_add_tail(&mall_entry->list, &block->mall_list);
return 0;
rollback:
list_for_each_entry_continue_reverse(binding, &block->binding_list,
list)
mlxsw_sp_mall_port_rule_del(binding->mlxsw_sp_port, mall_entry);
errout:
kfree(mall_entry);
return err;
}
void mlxsw_sp_mall_destroy(struct mlxsw_sp_flow_block *block,
struct tc_cls_matchall_offload *f)
{
struct mlxsw_sp_flow_block_binding *binding;
struct mlxsw_sp_mall_entry *mall_entry;
mall_entry = mlxsw_sp_mall_entry_find(block, f->cookie);
if (!mall_entry) {
NL_SET_ERR_MSG(f->common.extack, "Entry not found");
return;
}
list_del(&mall_entry->list);
if (mall_entry->ingress)
block->egress_blocker_rule_count--;
else
block->ingress_blocker_rule_count--;
block->rule_count--;
list_for_each_entry(binding, &block->binding_list, list)
mlxsw_sp_mall_port_rule_del(binding->mlxsw_sp_port, mall_entry);
kfree_rcu(mall_entry, rcu); /* sample RX packets may be in-flight */
}
int mlxsw_sp_mall_port_bind(struct mlxsw_sp_flow_block *block,
struct mlxsw_sp_port *mlxsw_sp_port)
{
struct mlxsw_sp_mall_entry *mall_entry;
int err;
list_for_each_entry(mall_entry, &block->mall_list, list) {
err = mlxsw_sp_mall_port_rule_add(mlxsw_sp_port, mall_entry);
if (err)
goto rollback;
}
return 0;
rollback:
list_for_each_entry_continue_reverse(mall_entry, &block->mall_list,
list)
mlxsw_sp_mall_port_rule_del(mlxsw_sp_port, mall_entry);
return err;
}
void mlxsw_sp_mall_port_unbind(struct mlxsw_sp_flow_block *block,
struct mlxsw_sp_port *mlxsw_sp_port)
{
struct mlxsw_sp_mall_entry *mall_entry;
list_for_each_entry(mall_entry, &block->mall_list, list)
mlxsw_sp_mall_port_rule_del(mlxsw_sp_port, mall_entry);
}
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