Quelle  spectrum_flow.c   Sprache: C

// 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, extack);
 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;
 }
}