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/* Copyright (C) 2022 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/>.
*/
/*!
* \file
*
* \brief Ethernet device info interface.
*
* \addtogroup xdp
* @{
*/
#pragma once
#include <stddef.h>
#include <stdint.h>
#define KNOT_XDP_MAX_MTU 1790
/*!
* \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 Network card RSS configuration.
*/
typedef struct {
size_t table_size; /*!< Size of indirection table in four-bytes. */
size_t key_size; /*!< Size of the RSS key in bytes. */
uint32_t mask; /*!< Input mask for accessing the table. */
uint32_t data[]; /*!< Serialized key and table. */
} knot_eth_rss_conf_t;
/*!
* \brief Get RSS configuration of a network interface.
*
* \param devname Name of the ethdev (e.g. eth1).
* \param rss_conf Output RSS configuration. Must be freed explicitly.
*
* \return KNOT_E*
*/
int knot_eth_rss(const char *devname, knot_eth_rss_conf_t **rss_conf);
/*!
* \brief Get value of MTU setup on a network interface.
*
* \param devname Name of the ethdev (e.g. eth1).
*
* \retval < 0 KNOT_E* if error.
* \return >= 0 Interface MTU.
*/
int knot_eth_mtu(const char *devname);
/*!
* \brief Get the corresponding network interface name for the address.
*
* \param addr Address of the interface.
* \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);
/*!
* \brief Get the mapping of interface index to VLAN tags.
*
* \param vlan_map Output array of the mappings.
* \param vlan_map_max Maximum interface index allowed.
*
* \return KNOT_E*
*/
int knot_eth_vlans(uint16_t *vlan_map[], uint16_t *vlan_map_max);
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 interface.
*
* \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);
/*! @} */
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