rte_ether.h

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/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#ifndef _RTE_ETHER_H_
#define _RTE_ETHER_H_

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <stdio.h>

#include <rte_memcpy.h>
#include <rte_random.h>
#include <rte_mbuf.h>
#include <rte_byteorder.h>

#define RTE_ETHER_ADDR_LEN  6 
#define RTE_ETHER_TYPE_LEN  2 
#define RTE_ETHER_CRC_LEN   4 
#define RTE_ETHER_HDR_LEN   \
    (RTE_ETHER_ADDR_LEN * 2 + \
        RTE_ETHER_TYPE_LEN) 
#define RTE_ETHER_MIN_LEN   64    
#define RTE_ETHER_MAX_LEN   1518  
#define RTE_ETHER_MTU       \
    (RTE_ETHER_MAX_LEN - RTE_ETHER_HDR_LEN - \
        RTE_ETHER_CRC_LEN) 
#define RTE_ETHER_MAX_VLAN_FRAME_LEN \
    (RTE_ETHER_MAX_LEN + 4)

#define RTE_ETHER_MAX_JUMBO_FRAME_LEN \
    0x3F00 
#define RTE_ETHER_MAX_VLAN_ID  4095 
#define RTE_ETHER_MIN_MTU 68 
struct rte_ether_addr {
    uint8_t addr_bytes[RTE_ETHER_ADDR_LEN]; 
} __attribute__((aligned(2)));

#define RTE_ETHER_LOCAL_ADMIN_ADDR 0x02 
#define RTE_ETHER_GROUP_ADDR  0x01 
static inline int rte_is_same_ether_addr(const struct rte_ether_addr *ea1,
                     const struct rte_ether_addr *ea2)
{
    const uint16_t *w1 = (const uint16_t *)ea1;
    const uint16_t *w2 = (const uint16_t *)ea2;

    return ((w1[0] ^ w2[0]) | (w1[1] ^ w2[1]) | (w1[2] ^ w2[2])) == 0;
}

static inline int rte_is_zero_ether_addr(const struct rte_ether_addr *ea)
{
    const uint16_t *w = (const uint16_t *)ea;

    return (w[0] | w[1] | w[2]) == 0;
}

static inline int rte_is_unicast_ether_addr(const struct rte_ether_addr *ea)
{
    return (ea->addr_bytes[0] & RTE_ETHER_GROUP_ADDR) == 0;
}

static inline int rte_is_multicast_ether_addr(const struct rte_ether_addr *ea)
{
    return ea->addr_bytes[0] & RTE_ETHER_GROUP_ADDR;
}

static inline int rte_is_broadcast_ether_addr(const struct rte_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);
}

static inline int rte_is_universal_ether_addr(const struct rte_ether_addr *ea)
{
    return (ea->addr_bytes[0] & RTE_ETHER_LOCAL_ADMIN_ADDR) == 0;
}

static inline int rte_is_local_admin_ether_addr(const struct rte_ether_addr *ea)
{
    return (ea->addr_bytes[0] & RTE_ETHER_LOCAL_ADMIN_ADDR) != 0;
}

static inline int rte_is_valid_assigned_ether_addr(const struct rte_ether_addr *ea)
{
    return rte_is_unicast_ether_addr(ea) && (!rte_is_zero_ether_addr(ea));
}

void
rte_eth_random_addr(uint8_t *addr);

static inline void rte_ether_addr_copy(const struct rte_ether_addr *ea_from,
                   struct rte_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
}

#define RTE_ETHER_ADDR_FMT_SIZE         18

void
rte_ether_format_addr(char *buf, uint16_t size,
              const struct rte_ether_addr *eth_addr);
__rte_experimental
int
rte_ether_unformat_addr(const char *str, struct rte_ether_addr *eth_addr);

struct rte_ether_hdr {
    struct rte_ether_addr d_addr; 
    struct rte_ether_addr s_addr; 
    uint16_t ether_type;      
} __attribute__((aligned(2)));

struct rte_vlan_hdr {
    uint16_t vlan_tci; 
    uint16_t eth_proto;
} __attribute__((__packed__));



/* Ethernet frame types */
#define RTE_ETHER_TYPE_IPV4 0x0800 
#define RTE_ETHER_TYPE_IPV6 0x86DD 
#define RTE_ETHER_TYPE_ARP  0x0806 
#define RTE_ETHER_TYPE_RARP 0x8035 
#define RTE_ETHER_TYPE_VLAN 0x8100 
#define RTE_ETHER_TYPE_QINQ 0x88A8 
#define RTE_ETHER_TYPE_PPPOE_DISCOVERY 0x8863 
#define RTE_ETHER_TYPE_PPPOE_SESSION 0x8864 
#define RTE_ETHER_TYPE_ETAG 0x893F 
#define RTE_ETHER_TYPE_1588 0x88F7

#define RTE_ETHER_TYPE_SLOW 0x8809 
#define RTE_ETHER_TYPE_TEB  0x6558 
#define RTE_ETHER_TYPE_LLDP 0x88CC 
#define RTE_ETHER_TYPE_MPLS 0x8847 
#define RTE_ETHER_TYPE_MPLSM 0x8848 
static inline int rte_vlan_strip(struct rte_mbuf *m)
{
    struct rte_ether_hdr *eh
         = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
    struct rte_vlan_hdr *vh;

    if (eh->ether_type != rte_cpu_to_be_16(RTE_ETHER_TYPE_VLAN))
        return -1;

    vh = (struct rte_vlan_hdr *)(eh + 1);
    m->ol_flags |= PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED;
    m->vlan_tci = rte_be_to_cpu_16(vh->vlan_tci);

    /* Copy ether header over rather than moving whole packet */
    memmove(rte_pktmbuf_adj(m, sizeof(struct rte_vlan_hdr)),
        eh, 2 * RTE_ETHER_ADDR_LEN);

    return 0;
}

static inline int rte_vlan_insert(struct rte_mbuf **m)
{
    struct rte_ether_hdr *oh, *nh;
    struct rte_vlan_hdr *vh;

    /* Can't insert header if mbuf is shared */
    if (!RTE_MBUF_DIRECT(*m) || rte_mbuf_refcnt_read(*m) > 1)
        return -EINVAL;

    oh = rte_pktmbuf_mtod(*m, struct rte_ether_hdr *);
    nh = (struct rte_ether_hdr *)(void *)
        rte_pktmbuf_prepend(*m, sizeof(struct rte_vlan_hdr));
    if (nh == NULL)
        return -ENOSPC;

    memmove(nh, oh, 2 * RTE_ETHER_ADDR_LEN);
    nh->ether_type = rte_cpu_to_be_16(RTE_ETHER_TYPE_VLAN);

    vh = (struct rte_vlan_hdr *) (nh + 1);
    vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci);

    (*m)->ol_flags &= ~(PKT_RX_VLAN_STRIPPED | PKT_TX_VLAN);

    if ((*m)->ol_flags & PKT_TX_TUNNEL_MASK)
        (*m)->outer_l2_len += sizeof(struct rte_vlan_hdr);
    else
        (*m)->l2_len += sizeof(struct rte_vlan_hdr);

    return 0;
}

#ifdef __cplusplus
}
#endif

#endif /* _RTE_ETHER_H_ */