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/*-
 *   BSD LICENSE
 *
 *   Copyright 2016 6WIND S.A.
 *   Copyright 2016 Mellanox.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of 6WIND S.A. nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdint.h>

#include <rte_errno.h>
#include <rte_branch_prediction.h>
#include "rte_ethdev.h"
#include "rte_flow_driver.h"
#include "rte_flow.h"

/* Get generic flow operations structure from a port. */
const struct rte_flow_ops *
rte_flow_ops_get(uint8_t port_id, struct rte_flow_error *error)
{
	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
	const struct rte_flow_ops *ops;
	int code;

	if (unlikely(!rte_eth_dev_is_valid_port(port_id)))
		code = ENODEV;
	else if (unlikely(!dev->dev_ops->filter_ctrl ||
			  dev->dev_ops->filter_ctrl(dev,
						    RTE_ETH_FILTER_GENERIC,
						    RTE_ETH_FILTER_GET,
						    &ops) ||
			  !ops))
		code = ENOSYS;
	else
		return ops;
	rte_flow_error_set(error, code, RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
			   NULL, rte_strerror(code));
	return NULL;
}

/* Check whether a flow rule can be created on a given port. */
int
rte_flow_validate(uint8_t port_id,
		  const struct rte_flow_attr *attr,
		  const struct rte_flow_item pattern[],
		  const struct rte_flow_action actions[],
		  struct rte_flow_error *error)
{
	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);
	struct rte_eth_dev *dev = &rte_eth_devices[port_id];

	if (unlikely(!ops))
		return -rte_errno;
	if (likely(!!ops->validate))
		return ops->validate(dev, attr, pattern, actions, error);
	return -rte_flow_error_set(error, ENOSYS,
				   RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
				   NULL, rte_strerror(ENOSYS));
}

/* Create a flow rule on a given port. */
struct rte_flow *
rte_flow_create(uint8_t port_id,
		const struct rte_flow_attr *attr,
		const struct rte_flow_item pattern[],
		const struct rte_flow_action actions[],
		struct rte_flow_error *error)
{
	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);

	if (unlikely(!ops))
		return NULL;
	if (likely(!!ops->create))
		return ops->create(dev, attr, pattern, actions, error);
	rte_flow_error_set(error, ENOSYS, RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
			   NULL, rte_strerror(ENOSYS));
	return NULL;
}

/* Destroy a flow rule on a given port. */
int
rte_flow_destroy(uint8_t port_id,
		 struct rte_flow *flow,
		 struct rte_flow_error *error)
{
	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);

	if (unlikely(!ops))
		return -rte_errno;
	if (likely(!!ops->destroy))
		return ops->destroy(dev, flow, error);
	return -rte_flow_error_set(error, ENOSYS,
				   RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
				   NULL, rte_strerror(ENOSYS));
}

/* Destroy all flow rules associated with a port. */
int
rte_flow_flush(uint8_t port_id,
	       struct rte_flow_error *error)
{
	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);

	if (unlikely(!ops))
		return -rte_errno;
	if (likely(!!ops->flush))
		return ops->flush(dev, error);
	return -rte_flow_error_set(error, ENOSYS,
				   RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
				   NULL, rte_strerror(ENOSYS));
}

/* Query an existing flow rule. */
int
rte_flow_query(uint8_t port_id,
	       struct rte_flow *flow,
	       enum rte_flow_action_type action,
	       void *data,
	       struct rte_flow_error *error)
{
	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);

	if (!ops)
		return -rte_errno;
	if (likely(!!ops->query))
		return ops->query(dev, flow, action, data, error);
	return -rte_flow_error_set(error, ENOSYS,
				   RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
				   NULL, rte_strerror(ENOSYS));
}