Quelle  prestera_matchall.c   Sprache: C

// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2019-2022 Marvell International Ltd. All rights reserved */

#include <linux/kernel.h>
#include <linux/list.h>

#include "prestera.h"
#include "prestera_hw.h"
#include "prestera_flow.h"
#include "prestera_flower.h"
#include "prestera_matchall.h"
#include "prestera_span.h"

static int prestera_mall_prio_check(struct prestera_flow_block *block,
        struct tc_cls_matchall_offload *f)
{
 u32 flower_prio_min;
 u32 flower_prio_max;
 int err;

 err = prestera_flower_prio_get(block, f->common.chain_index,
           &flower_prio_min, &flower_prio_max);
 if (err == -ENOENT)
  /* No flower filters installed on this chain. */
  return 0;

 if (err) {
  NL_SET_ERR_MSG(f->common.extack, "Failed to get flower priorities");
  return err;
 }

 if (f->common.prio <= flower_prio_max && !block->ingress) {
  NL_SET_ERR_MSG(f->common.extack, "Failed to add in front of existing flower rules");
  return -EOPNOTSUPP;
 }
 if (f->common.prio >= flower_prio_min && block->ingress) {
  NL_SET_ERR_MSG(f->common.extack, "Failed to add behind of existing flower rules");
  return -EOPNOTSUPP;
 }

 return 0;
}

int prestera_mall_prio_get(struct prestera_flow_block *block,
      u32 *prio_min, u32 *prio_max)
{
 if (!block->mall.bound)
  return -ENOENT;

 *prio_min = block->mall.prio_min;
 *prio_max = block->mall.prio_max;
 return 0;
}

static void prestera_mall_prio_update(struct prestera_flow_block *block,
          struct tc_cls_matchall_offload *f)
{
 block->mall.prio_min = min(block->mall.prio_min, f->common.prio);
 block->mall.prio_max = max(block->mall.prio_max, f->common.prio);
}

int prestera_mall_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;

 err = prestera_mall_prio_check(block, f);
 if (err)
  return err;

 port = netdev_priv(act->dev);

 list_for_each_entry(binding, &block->binding_list, list) {
  err = prestera_span_rule_add(binding, port, block->ingress);
  if (err == -EEXIST)
   return err;
  if (err)
   goto rollback;
 }

 prestera_mall_prio_update(block, f);

 block->mall.bound = true;
 return 0;

rollback:
 list_for_each_entry_continue_reverse(binding,
          &block->binding_list, list)
  prestera_span_rule_del(binding, block->ingress);
 return err;
}

void prestera_mall_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, block->ingress);

 block->mall.prio_min = UINT_MAX;
 block->mall.prio_max = 0;
 block->mall.bound = false;
}