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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/slab.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <net/net_namespace.h>
#include "spectrum.h"
struct mlxsw_sp_flow_block *
mlxsw_sp_flow_block_create(struct mlxsw_sp *mlxsw_sp, struct net *net)
{
struct mlxsw_sp_flow_block *block;
block = kzalloc(sizeof(*block), GFP_KERNEL);
if (!block)
return NULL;
INIT_LIST_HEAD(&block->binding_list);
INIT_LIST_HEAD(&block->mall.list);
block->mlxsw_sp = mlxsw_sp;
block->net = net;
return block;
}
void mlxsw_sp_flow_block_destroy(struct mlxsw_sp_flow_block *block)
{
WARN_ON(!list_empty(&block->binding_list));
kfree(block);
}
static struct mlxsw_sp_flow_block_binding *
mlxsw_sp_flow_block_lookup(struct mlxsw_sp_flow_block *block,
struct mlxsw_sp_port *mlxsw_sp_port, bool ingress)
{
struct mlxsw_sp_flow_block_binding *binding;
list_for_each_entry(binding, &block->binding_list, list)
if (binding->mlxsw_sp_port == mlxsw_sp_port &&
binding->ingress == ingress)
return binding;
return NULL;
}
static bool
mlxsw_sp_flow_block_ruleset_bound(const struct mlxsw_sp_flow_block *block)
{
return block->ruleset_zero;
}
static int mlxsw_sp_flow_block_bind(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_flow_block *block,
struct mlxsw_sp_port *mlxsw_sp_port,
bool ingress,
struct netlink_ext_ack *extack)
{
struct mlxsw_sp_flow_block_binding *binding;
int err;
if (WARN_ON(mlxsw_sp_flow_block_lookup(block, mlxsw_sp_port, ingress)))
return -EEXIST;
if (ingress && block->ingress_blocker_rule_count) {
NL_SET_ERR_MSG_MOD(extack, "Block cannot be bound to ingress because it contains unsupported rules");
return -EOPNOTSUPP;
}
if (!ingress && block->egress_blocker_rule_count) {
NL_SET_ERR_MSG_MOD(extack, "Block cannot be bound to egress because it contains unsupported rules");
return -EOPNOTSUPP;
}
err = mlxsw_sp_mall_port_bind(block, mlxsw_sp_port);
if (err)
return err;
binding = kzalloc(sizeof(*binding), GFP_KERNEL);
if (!binding) {
err = -ENOMEM;
goto err_binding_alloc;
}
binding->mlxsw_sp_port = mlxsw_sp_port;
binding->ingress = ingress;
if (mlxsw_sp_flow_block_ruleset_bound(block)) {
err = mlxsw_sp_acl_ruleset_bind(mlxsw_sp, block, binding);
if (err)
goto err_ruleset_bind;
}
if (ingress)
block->ingress_binding_count++;
else
block->egress_binding_count++;
list_add(&binding->list, &block->binding_list);
return 0;
err_ruleset_bind:
kfree(binding);
err_binding_alloc:
mlxsw_sp_mall_port_unbind(block, mlxsw_sp_port);
return err;
}
static int mlxsw_sp_flow_block_unbind(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_flow_block *block,
struct mlxsw_sp_port *mlxsw_sp_port,
bool ingress)
{
struct mlxsw_sp_flow_block_binding *binding;
binding = mlxsw_sp_flow_block_lookup(block, mlxsw_sp_port, ingress);
if (!binding)
return -ENOENT;
list_del(&binding->list);
if (ingress)
block->ingress_binding_count--;
else
block->egress_binding_count--;
if (mlxsw_sp_flow_block_ruleset_bound(block))
mlxsw_sp_acl_ruleset_unbind(mlxsw_sp, block, binding);
kfree(binding);
mlxsw_sp_mall_port_unbind(block, mlxsw_sp_port);
return 0;
}
static int mlxsw_sp_flow_block_mall_cb(struct mlxsw_sp_flow_block *flow_block,
struct tc_cls_matchall_offload *f)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_sp_flow_block_mlxsw_sp(flow_block);
switch (f->command) {
case TC_CLSMATCHALL_REPLACE:
return mlxsw_sp_mall_replace(mlxsw_sp, flow_block, f);
case TC_CLSMATCHALL_DESTROY:
mlxsw_sp_mall_destroy(flow_block, f);
return 0;
default:
return -EOPNOTSUPP;
}
}
static int mlxsw_sp_flow_block_flower_cb(struct mlxsw_sp_flow_block *flow_block,
struct flow_cls_offload *f)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_sp_flow_block_mlxsw_sp(flow_block);
switch (f->command) {
case FLOW_CLS_REPLACE:
return mlxsw_sp_flower_replace(mlxsw_sp, flow_block, f);
case FLOW_CLS_DESTROY:
mlxsw_sp_flower_destroy(mlxsw_sp, flow_block, f);
return 0;
case FLOW_CLS_STATS:
return mlxsw_sp_flower_stats(mlxsw_sp, flow_block, f);
case FLOW_CLS_TMPLT_CREATE:
return mlxsw_sp_flower_tmplt_create(mlxsw_sp, flow_block, f);
case FLOW_CLS_TMPLT_DESTROY:
mlxsw_sp_flower_tmplt_destroy(mlxsw_sp, flow_block, f);
return 0;
default:
return -EOPNOTSUPP;
}
}
static int mlxsw_sp_flow_block_cb(enum tc_setup_type type,
void *type_data, void *cb_priv)
{
struct mlxsw_sp_flow_block *flow_block = cb_priv;
if (mlxsw_sp_flow_block_disabled(flow_block))
return -EOPNOTSUPP;
switch (type) {
case TC_SETUP_CLSMATCHALL:
return mlxsw_sp_flow_block_mall_cb(flow_block, type_data);
case TC_SETUP_CLSFLOWER:
return mlxsw_sp_flow_block_flower_cb(flow_block, type_data);
default:
return -EOPNOTSUPP;
}
}
static void mlxsw_sp_tc_block_release(void *cb_priv)
{
struct mlxsw_sp_flow_block *flow_block = cb_priv;
mlxsw_sp_flow_block_destroy(flow_block);
}
static LIST_HEAD(mlxsw_sp_block_cb_list);
static int mlxsw_sp_setup_tc_block_bind(struct mlxsw_sp_port *mlxsw_sp_port,
struct flow_block_offload *f,
bool ingress)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
struct mlxsw_sp_flow_block *flow_block;
struct flow_block_cb *block_cb;
bool register_block = false;
int err;
block_cb = flow_block_cb_lookup(f->block, mlxsw_sp_flow_block_cb,
mlxsw_sp);
if (!block_cb) {
flow_block = mlxsw_sp_flow_block_create(mlxsw_sp, f->net);
if (!flow_block)
return -ENOMEM;
block_cb = flow_block_cb_alloc(mlxsw_sp_flow_block_cb,
mlxsw_sp, flow_block,
mlxsw_sp_tc_block_release);
if (IS_ERR(block_cb)) {
mlxsw_sp_flow_block_destroy(flow_block);
return PTR_ERR(block_cb);
}
register_block = true;
} else {
flow_block = flow_block_cb_priv(block_cb);
}
flow_block_cb_incref(block_cb);
err = mlxsw_sp_flow_block_bind(mlxsw_sp, flow_block,
mlxsw_sp_port, ingress, f->extack);
if (err)
goto err_block_bind;
if (ingress)
mlxsw_sp_port->ing_flow_block = flow_block;
else
mlxsw_sp_port->eg_flow_block = flow_block;
if (register_block) {
flow_block_cb_add(block_cb, f);
list_add_tail(&block_cb->driver_list, &mlxsw_sp_block_cb_list);
}
return 0;
err_block_bind:
if (!flow_block_cb_decref(block_cb))
flow_block_cb_free(block_cb);
return err;
}
static void mlxsw_sp_setup_tc_block_unbind(struct mlxsw_sp_port *mlxsw_sp_port,
struct flow_block_offload *f,
bool ingress)
{
struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
struct mlxsw_sp_flow_block *flow_block;
struct flow_block_cb *block_cb;
int err;
block_cb = flow_block_cb_lookup(f->block, mlxsw_sp_flow_block_cb,
mlxsw_sp);
if (!block_cb)
return;
if (ingress)
mlxsw_sp_port->ing_flow_block = NULL;
else
mlxsw_sp_port->eg_flow_block = NULL;
flow_block = flow_block_cb_priv(block_cb);
err = mlxsw_sp_flow_block_unbind(mlxsw_sp, flow_block,
mlxsw_sp_port, ingress);
if (!err && !flow_block_cb_decref(block_cb)) {
flow_block_cb_remove(block_cb, f);
list_del(&block_cb->driver_list);
}
}
int mlxsw_sp_setup_tc_block_clsact(struct mlxsw_sp_port *mlxsw_sp_port,
struct flow_block_offload *f,
bool ingress)
{
f->driver_block_list = &mlxsw_sp_block_cb_list;
switch (f->command) {
case FLOW_BLOCK_BIND:
return mlxsw_sp_setup_tc_block_bind(mlxsw_sp_port, f, ingress);
case FLOW_BLOCK_UNBIND:
mlxsw_sp_setup_tc_block_unbind(mlxsw_sp_port, f, ingress);
return 0;
default:
return -EOPNOTSUPP;
}
}
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