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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2020 Marvell International Ltd. All rights reserved */
#include <linux/kernel.h>
#include <linux/list.h>
#include "prestera.h"
#include "prestera_hw.h"
#include "prestera_acl.h"
#include "prestera_flow.h"
#include "prestera_span.h"
struct prestera_span_entry {
struct list_head list;
struct prestera_port *port;
refcount_t ref_count;
u8 id;
};
struct prestera_span {
struct prestera_switch *sw;
struct list_head entries;
};
static struct prestera_span_entry *
prestera_span_entry_create(struct prestera_port *port, u8 span_id)
{
struct prestera_span_entry *entry;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return ERR_PTR(-ENOMEM);
refcount_set(&entry->ref_count, 1);
entry->port = port;
entry->id = span_id;
list_add_tail(&entry->list, &port->sw->span->entries);
return entry;
}
static void prestera_span_entry_del(struct prestera_span_entry *entry)
{
list_del(&entry->list);
kfree(entry);
}
static struct prestera_span_entry *
prestera_span_entry_find_by_id(struct prestera_span *span, u8 span_id)
{
struct prestera_span_entry *entry;
list_for_each_entry(entry, &span->entries, list) {
if (entry->id == span_id)
return entry;
}
return NULL;
}
static struct prestera_span_entry *
prestera_span_entry_find_by_port(struct prestera_span *span,
struct prestera_port *port)
{
struct prestera_span_entry *entry;
list_for_each_entry(entry, &span->entries, list) {
if (entry->port == port)
return entry;
}
return NULL;
}
static int prestera_span_get(struct prestera_port *port, u8 *span_id)
{
u8 new_span_id;
struct prestera_switch *sw = port->sw;
struct prestera_span_entry *entry;
int err;
entry = prestera_span_entry_find_by_port(sw->span, port);
if (entry) {
refcount_inc(&entry->ref_count);
*span_id = entry->id;
return 0;
}
err = prestera_hw_span_get(port, &new_span_id);
if (err)
return err;
entry = prestera_span_entry_create(port, new_span_id);
if (IS_ERR(entry)) {
prestera_hw_span_release(sw, new_span_id);
return PTR_ERR(entry);
}
*span_id = new_span_id;
return 0;
}
static int prestera_span_put(struct prestera_switch *sw, u8 span_id)
{
struct prestera_span_entry *entry;
int err;
entry = prestera_span_entry_find_by_id(sw->span, span_id);
if (!entry)
return false;
if (!refcount_dec_and_test(&entry->ref_count))
return 0;
err = prestera_hw_span_release(sw, span_id);
if (err)
return err;
prestera_span_entry_del(entry);
return 0;
}
static int prestera_span_rule_add(struct prestera_flow_block_binding *binding,
struct prestera_port *to_port)
{
struct prestera_switch *sw = binding->port->sw;
u8 span_id;
int err;
if (binding->span_id != PRESTERA_SPAN_INVALID_ID)
/* port already in mirroring */
return -EEXIST;
err = prestera_span_get(to_port, &span_id);
if (err)
return err;
err = prestera_hw_span_bind(binding->port, span_id);
if (err) {
prestera_span_put(sw, span_id);
return err;
}
binding->span_id = span_id;
return 0;
}
static int prestera_span_rule_del(struct prestera_flow_block_binding *binding)
{
int err;
err = prestera_hw_span_unbind(binding->port);
if (err)
return err;
err = prestera_span_put(binding->port->sw, binding->span_id);
if (err)
return err;
binding->span_id = PRESTERA_SPAN_INVALID_ID;
return 0;
}
int prestera_span_replace(struct prestera_flow_block *block,
struct tc_cls_matchall_offload *f)
{
struct prestera_flow_block_binding *binding;
__be16 protocol = f->common.protocol;
struct flow_action_entry *act;
struct prestera_port *port;
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;
}
act = &f->rule->action.entries[0];
if (!prestera_netdev_check(act->dev)) {
NL_SET_ERR_MSG(f->common.extack,
"Only Marvell Prestera port is supported");
return -EINVAL;
}
if (!tc_cls_can_offload_and_chain0(act->dev, &f->common))
return -EOPNOTSUPP;
if (act->id != FLOW_ACTION_MIRRED)
return -EOPNOTSUPP;
if (protocol != htons(ETH_P_ALL))
return -EOPNOTSUPP;
port = netdev_priv(act->dev);
list_for_each_entry(binding, &block->binding_list, list) {
err = prestera_span_rule_add(binding, port);
if (err)
goto rollback;
}
return 0;
rollback:
list_for_each_entry_continue_reverse(binding,
&block->binding_list, list)
prestera_span_rule_del(binding);
return err;
}
void prestera_span_destroy(struct prestera_flow_block *block)
{
struct prestera_flow_block_binding *binding;
list_for_each_entry(binding, &block->binding_list, list)
prestera_span_rule_del(binding);
}
int prestera_span_init(struct prestera_switch *sw)
{
struct prestera_span *span;
span = kzalloc(sizeof(*span), GFP_KERNEL);
if (!span)
return -ENOMEM;
INIT_LIST_HEAD(&span->entries);
sw->span = span;
span->sw = sw;
return 0;
}
void prestera_span_fini(struct prestera_switch *sw)
{
struct prestera_span *span = sw->span;
WARN_ON(!list_empty(&span->entries));
kfree(span);
}
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