/*  Copyright (C) 2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#pragma once

#include <stddef.h>

/*!
 * \brief Get number of combined queues of a network interface.
 *
 * \param devname  Name of the ethdev (e.g. eth1).
 *
 * \retval < 0   KNOT_E* if error.
 * \retval 1     Default no of queues if the dev does not support.
 * \return > 0   Number of queues.
 */
int knot_eth_queues(const char *devname);

/*!
 * \brief Get the corresponding network interface name for the address.
 *
 * \param addr     Address of the inteface.
 * \param out      Output buffer for the interface name.
 * \param out_len  Size of the output buffer.
 *
 * \return KNOT_E*
 */
int knot_eth_name_from_addr(const struct sockaddr_storage *addr, char *out,
                            size_t out_len);

typedef enum {
	KNOT_XDP_MODE_NONE, /*!< XDP not available, BPF not loaded, or error. */
	KNOT_XDP_MODE_FULL, /*!< Full XDP support in driver or HW. */
	KNOT_XDP_MODE_EMUL, /*!< Emulated XDP support. */
} knot_xdp_mode_t;

/*!
 * \brief Return the current XDP mode of a network inteface.
 *
 * \param if_index  Index of the interface, output from if_nametoindex().
 *
 * \return Current XDP mode.
 */
knot_xdp_mode_t knot_eth_xdp_mode(int if_index);