128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/* Copyright (c) 2019-2022 Marvell International Ltd. All rights reserved */
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include "prestera.h"
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#include "prestera_hw.h"
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#include "prestera_flow.h"
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#include "prestera_flower.h"
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#include "prestera_matchall.h"
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#include "prestera_span.h"
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static int prestera_mall_prio_check(struct prestera_flow_block *block,
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struct tc_cls_matchall_offload *f)
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{
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u32 flower_prio_min;
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u32 flower_prio_max;
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int err;
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err = prestera_flower_prio_get(block, f->common.chain_index,
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&flower_prio_min, &flower_prio_max);
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if (err == -ENOENT)
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/* No flower filters installed on this chain. */
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return 0;
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if (err) {
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NL_SET_ERR_MSG(f->common.extack, "Failed to get flower priorities");
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return err;
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}
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if (f->common.prio <= flower_prio_max && !block->ingress) {
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NL_SET_ERR_MSG(f->common.extack, "Failed to add in front of existing flower rules");
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return -EOPNOTSUPP;
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}
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if (f->common.prio >= flower_prio_min && block->ingress) {
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NL_SET_ERR_MSG(f->common.extack, "Failed to add behind of existing flower rules");
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return -EOPNOTSUPP;
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}
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return 0;
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}
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int prestera_mall_prio_get(struct prestera_flow_block *block,
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u32 *prio_min, u32 *prio_max)
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{
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if (!block->mall.bound)
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return -ENOENT;
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*prio_min = block->mall.prio_min;
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*prio_max = block->mall.prio_max;
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return 0;
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}
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static void prestera_mall_prio_update(struct prestera_flow_block *block,
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struct tc_cls_matchall_offload *f)
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{
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block->mall.prio_min = min(block->mall.prio_min, f->common.prio);
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block->mall.prio_max = max(block->mall.prio_max, f->common.prio);
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}
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int prestera_mall_replace(struct prestera_flow_block *block,
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struct tc_cls_matchall_offload *f)
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{
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struct prestera_flow_block_binding *binding;
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__be16 protocol = f->common.protocol;
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struct flow_action_entry *act;
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struct prestera_port *port;
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int err;
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if (!flow_offload_has_one_action(&f->rule->action)) {
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NL_SET_ERR_MSG(f->common.extack,
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"Only singular actions are supported");
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return -EOPNOTSUPP;
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}
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act = &f->rule->action.entries[0];
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if (!prestera_netdev_check(act->dev)) {
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NL_SET_ERR_MSG(f->common.extack,
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"Only Marvell Prestera port is supported");
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return -EINVAL;
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}
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if (!tc_cls_can_offload_and_chain0(act->dev, &f->common))
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return -EOPNOTSUPP;
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if (act->id != FLOW_ACTION_MIRRED)
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return -EOPNOTSUPP;
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if (protocol != htons(ETH_P_ALL))
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return -EOPNOTSUPP;
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err = prestera_mall_prio_check(block, f);
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if (err)
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return err;
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port = netdev_priv(act->dev);
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list_for_each_entry(binding, &block->binding_list, list) {
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err = prestera_span_rule_add(binding, port, block->ingress);
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if (err == -EEXIST)
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return err;
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if (err)
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goto rollback;
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}
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prestera_mall_prio_update(block, f);
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block->mall.bound = true;
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return 0;
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rollback:
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list_for_each_entry_continue_reverse(binding,
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&block->binding_list, list)
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prestera_span_rule_del(binding, block->ingress);
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return err;
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}
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void prestera_mall_destroy(struct prestera_flow_block *block)
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{
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struct prestera_flow_block_binding *binding;
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list_for_each_entry(binding, &block->binding_list, list)
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prestera_span_rule_del(binding, block->ingress);
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block->mall.prio_min = UINT_MAX;
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block->mall.prio_max = 0;
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block->mall.bound = false;
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}
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