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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_acl.h"
#include "prestera_flow.h"
#include "prestera_flower.h"
#include "prestera_matchall.h"
#include "prestera_span.h"
static LIST_HEAD(prestera_block_cb_list);
static int prestera_flow_block_mall_cb(struct prestera_flow_block *block,
struct tc_cls_matchall_offload *f)
{
switch (f->command) {
case TC_CLSMATCHALL_REPLACE:
return prestera_mall_replace(block, f);
case TC_CLSMATCHALL_DESTROY:
prestera_mall_destroy(block);
return 0;
default:
return -EOPNOTSUPP;
}
}
static int prestera_flow_block_flower_cb(struct prestera_flow_block *block,
struct flow_cls_offload *f)
{
switch (f->command) {
case FLOW_CLS_REPLACE:
return prestera_flower_replace(block, f);
case FLOW_CLS_DESTROY:
prestera_flower_destroy(block, f);
return 0;
case FLOW_CLS_STATS:
return prestera_flower_stats(block, f);
case FLOW_CLS_TMPLT_CREATE:
return prestera_flower_tmplt_create(block, f);
case FLOW_CLS_TMPLT_DESTROY:
prestera_flower_tmplt_destroy(block, f);
return 0;
default:
return -EOPNOTSUPP;
}
}
static int prestera_flow_block_cb(enum tc_setup_type type,
void *type_data, void *cb_priv)
{
struct prestera_flow_block *block = cb_priv;
switch (type) {
case TC_SETUP_CLSFLOWER:
return prestera_flow_block_flower_cb(block, type_data);
case TC_SETUP_CLSMATCHALL:
return prestera_flow_block_mall_cb(block, type_data);
default:
return -EOPNOTSUPP;
}
}
static void prestera_flow_block_destroy(void *cb_priv)
{
struct prestera_flow_block *block = cb_priv;
prestera_flower_template_cleanup(block);
WARN_ON(!list_empty(&block->template_list));
WARN_ON(!list_empty(&block->binding_list));
kfree(block);
}
static struct prestera_flow_block *
prestera_flow_block_create(struct prestera_switch *sw,
struct net *net,
bool ingress)
{
struct prestera_flow_block *block;
block = kzalloc(sizeof(*block), GFP_KERNEL);
if (!block)
return NULL;
INIT_LIST_HEAD(&block->binding_list);
INIT_LIST_HEAD(&block->template_list);
block->net = net;
block->sw = sw;
block->mall.prio_min = UINT_MAX;
block->mall.prio_max = 0;
block->mall.bound = false;
block->ingress = ingress;
return block;
}
static void prestera_flow_block_release(void *cb_priv)
{
struct prestera_flow_block *block = cb_priv;
prestera_flow_block_destroy(block);
}
static bool
prestera_flow_block_is_bound(const struct prestera_flow_block *block)
{
return block->ruleset_zero;
}
static struct prestera_flow_block_binding *
prestera_flow_block_lookup(struct prestera_flow_block *block,
struct prestera_port *port)
{
struct prestera_flow_block_binding *binding;
list_for_each_entry(binding, &block->binding_list, list)
if (binding->port == port)
return binding;
return NULL;
}
static int prestera_flow_block_bind(struct prestera_flow_block *block,
struct prestera_port *port)
{
struct prestera_flow_block_binding *binding;
int err;
binding = kzalloc(sizeof(*binding), GFP_KERNEL);
if (!binding)
return -ENOMEM;
binding->span_id = PRESTERA_SPAN_INVALID_ID;
binding->port = port;
if (prestera_flow_block_is_bound(block)) {
err = prestera_acl_ruleset_bind(block->ruleset_zero, port);
if (err)
goto err_ruleset_bind;
}
list_add(&binding->list, &block->binding_list);
return 0;
err_ruleset_bind:
kfree(binding);
return err;
}
static int prestera_flow_block_unbind(struct prestera_flow_block *block,
struct prestera_port *port)
{
struct prestera_flow_block_binding *binding;
binding = prestera_flow_block_lookup(block, port);
if (!binding)
return -ENOENT;
list_del(&binding->list);
if (prestera_flow_block_is_bound(block))
prestera_acl_ruleset_unbind(block->ruleset_zero, port);
kfree(binding);
return 0;
}
static struct prestera_flow_block *
prestera_flow_block_get(struct prestera_switch *sw,
struct flow_block_offload *f,
bool *register_block,
bool ingress)
{
struct prestera_flow_block *block;
struct flow_block_cb *block_cb;
block_cb = flow_block_cb_lookup(f->block,
prestera_flow_block_cb, sw);
if (!block_cb) {
block = prestera_flow_block_create(sw, f->net, ingress);
if (!block)
return ERR_PTR(-ENOMEM);
block_cb = flow_block_cb_alloc(prestera_flow_block_cb,
sw, block,
prestera_flow_block_release);
if (IS_ERR(block_cb)) {
prestera_flow_block_destroy(block);
return ERR_CAST(block_cb);
}
block->block_cb = block_cb;
*register_block = true;
} else {
block = flow_block_cb_priv(block_cb);
*register_block = false;
}
flow_block_cb_incref(block_cb);
return block;
}
static void prestera_flow_block_put(struct prestera_flow_block *block)
{
struct flow_block_cb *block_cb = block->block_cb;
if (flow_block_cb_decref(block_cb))
return;
flow_block_cb_free(block_cb);
prestera_flow_block_destroy(block);
}
static int prestera_setup_flow_block_bind(struct prestera_port *port,
struct flow_block_offload *f, bool ingress)
{
struct prestera_switch *sw = port->sw;
struct prestera_flow_block *block;
struct flow_block_cb *block_cb;
bool register_block;
int err;
block = prestera_flow_block_get(sw, f, ®ister_block, ingress);
if (IS_ERR(block))
return PTR_ERR(block);
block_cb = block->block_cb;
err = prestera_flow_block_bind(block, port);
if (err)
goto err_block_bind;
if (register_block) {
flow_block_cb_add(block_cb, f);
list_add_tail(&block_cb->driver_list, &prestera_block_cb_list);
}
if (ingress)
port->ingress_flow_block = block;
else
port->egress_flow_block = block;
return 0;
err_block_bind:
prestera_flow_block_put(block);
return err;
}
static void prestera_setup_flow_block_unbind(struct prestera_port *port,
struct flow_block_offload *f, bool ingress)
{
struct prestera_switch *sw = port->sw;
struct prestera_flow_block *block;
struct flow_block_cb *block_cb;
int err;
block_cb = flow_block_cb_lookup(f->block, prestera_flow_block_cb, sw);
if (!block_cb)
return;
block = flow_block_cb_priv(block_cb);
prestera_mall_destroy(block);
err = prestera_flow_block_unbind(block, port);
if (err)
goto error;
if (!flow_block_cb_decref(block_cb)) {
flow_block_cb_remove(block_cb, f);
list_del(&block_cb->driver_list);
}
error:
if (ingress)
port->ingress_flow_block = NULL;
else
port->egress_flow_block = NULL;
}
static int prestera_setup_flow_block_clsact(struct prestera_port *port,
struct flow_block_offload *f,
bool ingress)
{
f->driver_block_list = &prestera_block_cb_list;
switch (f->command) {
case FLOW_BLOCK_BIND:
return prestera_setup_flow_block_bind(port, f, ingress);
case FLOW_BLOCK_UNBIND:
prestera_setup_flow_block_unbind(port, f, ingress);
return 0;
default:
return -EOPNOTSUPP;
}
}
int prestera_flow_block_setup(struct prestera_port *port,
struct flow_block_offload *f)
{
switch (f->binder_type) {
case FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS:
return prestera_setup_flow_block_clsact(port, f, true);
case FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS:
return prestera_setup_flow_block_clsact(port, f, false);
default:
return -EOPNOTSUPP;
}
}
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