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/*-
 *   BSD LICENSE
 * 
 *   Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
 *   All rights reserved.
 * 
 *   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 Intel Corporation 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.
 * 
 */

#ifndef _RTE_ETHER_H_
#define _RTE_ETHER_H_

/**
 * @file
 *
 * Ethernet Helpers in RTE
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>

#define ETHER_ADDR_LEN  6 /**< Length of Ethernet address. */
#define ETHER_TYPE_LEN  2 /**< Length of Ethernet type field. */
#define ETHER_CRC_LEN   4 /**< Length of Ethernet CRC. */
#define ETHER_HDR_LEN   \
	(ETHER_ADDR_LEN * 2 + ETHER_TYPE_LEN) /**< Length of Ethernet header. */
#define ETHER_MIN_LEN   64    /**< Minimum frame len, including CRC. */
#define ETHER_MAX_LEN   1518  /**< Maximum frame len, including CRC. */
#define ETHER_MTU       \
	(ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) /**< Ethernet MTU. */

#define ETHER_MAX_VLAN_FRAME_LEN \
	(ETHER_MAX_LEN + 4) /**< Maximum VLAN frame length, including CRC. */

#define ETHER_MAX_JUMBO_FRAME_LEN \
	0x3F00 /**< Maximum Jumbo frame length, including CRC. */

/**
 * Ethernet address:
 * A universally administered address is uniquely assigned to a device by its
 * manufacturer. The first three octets (in transmission order) contain the
 * Organizationally Unique Identifier (OUI). The following three (MAC-48 and
 * EUI-48) octets are assigned by that organization with the only constraint
 * of uniqueness.
 * A locally administered address is assigned to a device by a network
 * administrator and does not contain OUIs.
 * See http://standards.ieee.org/regauth/groupmac/tutorial.html
 */
struct ether_addr {
	uint8_t addr_bytes[ETHER_ADDR_LEN]; /**< Address bytes in transmission order */
} __attribute__((__packed__));

#define ETHER_LOCAL_ADMIN_ADDR 0x02 /**< Locally assigned Eth. address. */
#define ETHER_GROUP_ADDR       0x01 /**< Multicast or broadcast Eth. address. */

/**
 * Check if an Ethernet address is filled with zeros.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is filled with zeros;
 *   false (0) otherwise.
 */
static inline int is_zero_ether_addr(const struct ether_addr *ea)
{
	int i;
	for (i = 0; i < ETHER_ADDR_LEN; i++)
		if (ea->addr_bytes[i] != 0x00)
			return 0;
	return 1;
}

/**
 * Check if an Ethernet address is a unicast address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a unicast address;
 *   false (0) otherwise.
 */
static inline int is_unicast_ether_addr(const struct ether_addr *ea)
{
	return ((ea->addr_bytes[0] & ETHER_GROUP_ADDR) == 0);
}

/**
 * Check if an Ethernet address is a multicast address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a multicast address;
 *   false (0) otherwise.
 */
static inline int is_multicast_ether_addr(const struct ether_addr *ea)
{
	return (ea->addr_bytes[0] & ETHER_GROUP_ADDR);
}

/**
 * Check if an Ethernet address is a broadcast address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a broadcast address;
 *   false (0) otherwise.
 */
static inline int is_broadcast_ether_addr(const struct ether_addr *ea)
{
	const uint16_t *ea_words = (const uint16_t *)ea;

	return (ea_words[0] == 0xFFFF && ea_words[1] == 0xFFFF &&
		ea_words[2] == 0xFFFF);
}

/**
 * Check if an Ethernet address is a universally assigned address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a universally assigned address;
 *   false (0) otherwise.
 */
static inline int is_universal_ether_addr(const struct ether_addr *ea)
{
	return ((ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) == 0);
}

/**
 * Check if an Ethernet address is a locally assigned address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a locally assigned address;
 *   false (0) otherwise.
 */
static inline int is_local_admin_ether_addr(const struct ether_addr *ea)
{
	return ((ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) == 1);
}

/**
 * Check if an Ethernet address is a valid address. Checks that the address is a
 * unicast address and is not filled with zeros.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is valid;
 *   false (0) otherwise.
 */
static inline int is_valid_assigned_ether_addr(const struct ether_addr *ea)
{
	return (is_unicast_ether_addr(ea) && (! is_zero_ether_addr(ea)));
}

/**
 * Fast copy an Ethernet address.
 *
 * @param ea_from
 *   A pointer to a ether_addr structure holding the Ethernet address to copy.
 * @param ea_to
 *   A pointer to a ether_addr structure where to copy the Ethernet address.
 */
static inline void ether_addr_copy(const struct ether_addr *ea_from,
				   struct ether_addr *ea_to)
{
#ifdef __INTEL_COMPILER
	uint16_t *from_words = (uint16_t *)(ea_from->addr_bytes);
	uint16_t *to_words   = (uint16_t *)(ea_to->addr_bytes);

	to_words[0] = from_words[0];
	to_words[1] = from_words[1];
	to_words[2] = from_words[2];
#else
	/*
	 * Use the common way, because of a strange gcc warning.
	 */
	*ea_to = *ea_from;
#endif
}

/**
 * Ethernet header: Contains the destination address, source address
 * and frame type.
 */
struct ether_hdr {
	struct ether_addr d_addr; /**< Destination address. */
	struct ether_addr s_addr; /**< Source address. */
	uint16_t ether_type;      /**< Frame type. */
} __attribute__((__packed__));

/**
 * Ethernet VLAN Header.
 * Contains the 16-bit VLAN Tag Control Identifier and the Ethernet type
 * of the encapsulated frame.
 */
struct vlan_hdr {
	uint16_t vlan_tci; /**< Priority (3) + CFI (1) + Identifier Code (12) */
	uint16_t eth_proto;/**< Ethernet type of encapsulated frame. */
} __attribute__((__packed__));

/* Ethernet frame types */
#define ETHER_TYPE_IPv4 0x0800 /**< IPv4 Protocol. */
#define ETHER_TYPE_IPv6 0x86DD /**< IPv6 Protocol. */
#define ETHER_TYPE_ARP  0x0806 /**< Arp Protocol. */
#define ETHER_TYPE_RARP 0x8035 /**< Reverse Arp Protocol. */
#define ETHER_TYPE_VLAN 0x8100 /**< IEEE 802.1Q VLAN tagging. */
#define ETHER_TYPE_1588 0x88F7 /**< IEEE 802.1AS 1588 Precise Time Protocol. */

#ifdef __cplusplus
}
#endif

#endif /* _RTE_ETHER_H_ */