Re: [dpdk-dev] [PATCH 2/3] mbuf: move mbuf definition into a separate file

[Michel Machado <michel@digirati.com.br>]

Acked-by: Michel Machado <michel@digirati.com.br>

[ ]'s
Michel Machado

On 8/16/19 8:53 AM, Konstantin Ananyev wrote:
> Right now inclusion of rte_mbuf.h header can cause inclusion of
> some arch/os specific headers.
> That prevents it to be included directly by some
> non-DPDK (but related) entities: KNI, BPF programs, etc.
> To overcome that problem usually a separate definitions of rte_mbuf
> structure is created within these entities.
> That aproach has a lot of drawbacks: code duplication, error prone, etc.
> This patch moves rte_mbuf structure definition (and some related macros)
> into a separate file that can be included by both rte_mbuf.h and
> other non-DPDK entities.
> 
> Note that it doesn't introduce any change for current DPDK code.
> 
> Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> ---
>   lib/librte_mbuf/Makefile        |   5 +-
>   lib/librte_mbuf/meson.build     |   3 +-
>   lib/librte_mbuf/rte_mbuf.h      | 738 +----------------------------
>   lib/librte_mbuf/rte_mbuf_core.h | 793 ++++++++++++++++++++++++++++++++
>   4 files changed, 800 insertions(+), 739 deletions(-)
>   create mode 100644 lib/librte_mbuf/rte_mbuf_core.h
> 
> diff --git a/lib/librte_mbuf/Makefile b/lib/librte_mbuf/Makefile
> index c8f6d2689..f3b76ad23 100644
> --- a/lib/librte_mbuf/Makefile
> +++ b/lib/librte_mbuf/Makefile
> @@ -19,6 +19,9 @@ LIBABIVER := 5
>   SRCS-$(CONFIG_RTE_LIBRTE_MBUF) := rte_mbuf.c rte_mbuf_ptype.c rte_mbuf_pool_ops.c
>   
>   # install includes
> -SYMLINK-$(CONFIG_RTE_LIBRTE_MBUF)-include := rte_mbuf.h rte_mbuf_ptype.h rte_mbuf_pool_ops.h
> +SYMLINK-$(CONFIG_RTE_LIBRTE_MBUF)-include := rte_mbuf.h
> +SYMLINK-$(CONFIG_RTE_LIBRTE_MBUF)-include += rte_mbuf_core.h
> +SYMLINK-$(CONFIG_RTE_LIBRTE_MBUF)-include += rte_mbuf_ptype.h
> +SYMLINK-$(CONFIG_RTE_LIBRTE_MBUF)-include += rte_mbuf_pool_ops.h
>   
>   include $(RTE_SDK)/mk/rte.lib.mk
> diff --git a/lib/librte_mbuf/meson.build b/lib/librte_mbuf/meson.build
> index 6cc11ebb4..36bb6eb9d 100644
> --- a/lib/librte_mbuf/meson.build
> +++ b/lib/librte_mbuf/meson.build
> @@ -3,7 +3,8 @@
>   
>   version = 5
>   sources = files('rte_mbuf.c', 'rte_mbuf_ptype.c', 'rte_mbuf_pool_ops.c')
> -headers = files('rte_mbuf.h', 'rte_mbuf_ptype.h', 'rte_mbuf_pool_ops.h')
> +headers = files('rte_mbuf.h', 'rte_mbuf_core.h',
> +		'rte_mbuf_ptype.h', 'rte_mbuf_pool_ops.h')
>   deps += ['mempool']
>   
>   allow_experimental_apis = true
> diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
> index 98225ec80..528b2f121 100644
> --- a/lib/librte_mbuf/rte_mbuf.h
> +++ b/lib/librte_mbuf/rte_mbuf.h
> @@ -42,367 +42,12 @@
>   #include <rte_branch_prediction.h>
>   #include <rte_byteorder.h>
>   #include <rte_mbuf_ptype.h>
> +#include <rte_mbuf_core.h>
>   
>   #ifdef __cplusplus
>   extern "C" {
>   #endif
>   
> -/*
> - * Packet Offload Features Flags. It also carry packet type information.
> - * Critical resources. Both rx/tx shared these bits. Be cautious on any change
> - *
> - * - RX flags start at bit position zero, and get added to the left of previous
> - *   flags.
> - * - The most-significant 3 bits are reserved for generic mbuf flags
> - * - TX flags therefore start at bit position 60 (i.e. 63-3), and new flags get
> - *   added to the right of the previously defined flags i.e. they should count
> - *   downwards, not upwards.
> - *
> - * Keep these flags synchronized with rte_get_rx_ol_flag_name() and
> - * rte_get_tx_ol_flag_name().
> - */
> -
> -/**
> - * The RX packet is a 802.1q VLAN packet, and the tci has been
> - * saved in in mbuf->vlan_tci.
> - * If the flag PKT_RX_VLAN_STRIPPED is also present, the VLAN
> - * header has been stripped from mbuf data, else it is still
> - * present.
> - */
> -#define PKT_RX_VLAN          (1ULL << 0)
> -
> -#define PKT_RX_RSS_HASH      (1ULL << 1)  /**< RX packet with RSS hash result. */
> -#define PKT_RX_FDIR          (1ULL << 2)  /**< RX packet with FDIR match indicate. */
> -
> -/**
> - * Deprecated.
> - * Checking this flag alone is deprecated: check the 2 bits of
> - * PKT_RX_L4_CKSUM_MASK.
> - * This flag was set when the L4 checksum of a packet was detected as
> - * wrong by the hardware.
> - */
> -#define PKT_RX_L4_CKSUM_BAD  (1ULL << 3)
> -
> -/**
> - * Deprecated.
> - * Checking this flag alone is deprecated: check the 2 bits of
> - * PKT_RX_IP_CKSUM_MASK.
> - * This flag was set when the IP checksum of a packet was detected as
> - * wrong by the hardware.
> - */
> -#define PKT_RX_IP_CKSUM_BAD  (1ULL << 4)
> -
> -#define PKT_RX_EIP_CKSUM_BAD (1ULL << 5)  /**< External IP header checksum error. */
> -
> -/**
> - * A vlan has been stripped by the hardware and its tci is saved in
> - * mbuf->vlan_tci. This can only happen if vlan stripping is enabled
> - * in the RX configuration of the PMD.
> - * When PKT_RX_VLAN_STRIPPED is set, PKT_RX_VLAN must also be set.
> - */
> -#define PKT_RX_VLAN_STRIPPED (1ULL << 6)
> -
> -/**
> - * Mask of bits used to determine the status of RX IP checksum.
> - * - PKT_RX_IP_CKSUM_UNKNOWN: no information about the RX IP checksum
> - * - PKT_RX_IP_CKSUM_BAD: the IP checksum in the packet is wrong
> - * - PKT_RX_IP_CKSUM_GOOD: the IP checksum in the packet is valid
> - * - PKT_RX_IP_CKSUM_NONE: the IP checksum is not correct in the packet
> - *   data, but the integrity of the IP header is verified.
> - */
> -#define PKT_RX_IP_CKSUM_MASK ((1ULL << 4) | (1ULL << 7))
> -
> -#define PKT_RX_IP_CKSUM_UNKNOWN 0
> -#define PKT_RX_IP_CKSUM_BAD     (1ULL << 4)
> -#define PKT_RX_IP_CKSUM_GOOD    (1ULL << 7)
> -#define PKT_RX_IP_CKSUM_NONE    ((1ULL << 4) | (1ULL << 7))
> -
> -/**
> - * Mask of bits used to determine the status of RX L4 checksum.
> - * - PKT_RX_L4_CKSUM_UNKNOWN: no information about the RX L4 checksum
> - * - PKT_RX_L4_CKSUM_BAD: the L4 checksum in the packet is wrong
> - * - PKT_RX_L4_CKSUM_GOOD: the L4 checksum in the packet is valid
> - * - PKT_RX_L4_CKSUM_NONE: the L4 checksum is not correct in the packet
> - *   data, but the integrity of the L4 data is verified.
> - */
> -#define PKT_RX_L4_CKSUM_MASK ((1ULL << 3) | (1ULL << 8))
> -
> -#define PKT_RX_L4_CKSUM_UNKNOWN 0
> -#define PKT_RX_L4_CKSUM_BAD     (1ULL << 3)
> -#define PKT_RX_L4_CKSUM_GOOD    (1ULL << 8)
> -#define PKT_RX_L4_CKSUM_NONE    ((1ULL << 3) | (1ULL << 8))
> -
> -#define PKT_RX_IEEE1588_PTP  (1ULL << 9)  /**< RX IEEE1588 L2 Ethernet PT Packet. */
> -#define PKT_RX_IEEE1588_TMST (1ULL << 10) /**< RX IEEE1588 L2/L4 timestamped packet.*/
> -#define PKT_RX_FDIR_ID       (1ULL << 13) /**< FD id reported if FDIR match. */
> -#define PKT_RX_FDIR_FLX      (1ULL << 14) /**< Flexible bytes reported if FDIR match. */
> -
> -/**
> - * The 2 vlans have been stripped by the hardware and their tci are
> - * saved in mbuf->vlan_tci (inner) and mbuf->vlan_tci_outer (outer).
> - * This can only happen if vlan stripping is enabled in the RX
> - * configuration of the PMD.
> - * When PKT_RX_QINQ_STRIPPED is set, the flags (PKT_RX_VLAN |
> - * PKT_RX_VLAN_STRIPPED | PKT_RX_QINQ) must also be set.
> - */
> -#define PKT_RX_QINQ_STRIPPED (1ULL << 15)
> -
> -/**
> - * When packets are coalesced by a hardware or virtual driver, this flag
> - * can be set in the RX mbuf, meaning that the m->tso_segsz field is
> - * valid and is set to the segment size of original packets.
> - */
> -#define PKT_RX_LRO           (1ULL << 16)
> -
> -/**
> - * Indicate that the timestamp field in the mbuf is valid.
> - */
> -#define PKT_RX_TIMESTAMP     (1ULL << 17)
> -
> -/**
> - * Indicate that security offload processing was applied on the RX packet.
> - */
> -#define PKT_RX_SEC_OFFLOAD		(1ULL << 18)
> -
> -/**
> - * Indicate that security offload processing failed on the RX packet.
> - */
> -#define PKT_RX_SEC_OFFLOAD_FAILED  	(1ULL << 19)
> -
> -/**
> - * The RX packet is a double VLAN, and the outer tci has been
> - * saved in in mbuf->vlan_tci_outer. If PKT_RX_QINQ set, PKT_RX_VLAN
> - * also should be set and inner tci should be saved to mbuf->vlan_tci.
> - * If the flag PKT_RX_QINQ_STRIPPED is also present, both VLANs
> - * headers have been stripped from mbuf data, else they are still
> - * present.
> - */
> -#define PKT_RX_QINQ          (1ULL << 20)
> -
> -/**
> - * Mask of bits used to determine the status of outer RX L4 checksum.
> - * - PKT_RX_OUTER_L4_CKSUM_UNKNOWN: no info about the outer RX L4 checksum
> - * - PKT_RX_OUTER_L4_CKSUM_BAD: the outer L4 checksum in the packet is wrong
> - * - PKT_RX_OUTER_L4_CKSUM_GOOD: the outer L4 checksum in the packet is valid
> - * - PKT_RX_OUTER_L4_CKSUM_INVALID: invalid outer L4 checksum state.
> - *
> - * The detection of PKT_RX_OUTER_L4_CKSUM_GOOD shall be based on the given
> - * HW capability, At minimum, the PMD should support
> - * PKT_RX_OUTER_L4_CKSUM_UNKNOWN and PKT_RX_OUTER_L4_CKSUM_BAD states
> - * if the DEV_RX_OFFLOAD_OUTER_UDP_CKSUM offload is available.
> - */
> -#define PKT_RX_OUTER_L4_CKSUM_MASK	((1ULL << 21) | (1ULL << 22))
> -
> -#define PKT_RX_OUTER_L4_CKSUM_UNKNOWN	0
> -#define PKT_RX_OUTER_L4_CKSUM_BAD	(1ULL << 21)
> -#define PKT_RX_OUTER_L4_CKSUM_GOOD	(1ULL << 22)
> -#define PKT_RX_OUTER_L4_CKSUM_INVALID	((1ULL << 21) | (1ULL << 22))
> -
> -/* add new RX flags here */
> -
> -/* add new TX flags here */
> -
> -/**
> - * Indicate that the metadata field in the mbuf is in use.
> - */
> -#define PKT_TX_METADATA	(1ULL << 40)
> -
> -/**
> - * Outer UDP checksum offload flag. This flag is used for enabling
> - * outer UDP checksum in PMD. To use outer UDP checksum, the user needs to
> - * 1) Enable the following in mbuf,
> - * a) Fill outer_l2_len and outer_l3_len in mbuf.
> - * b) Set the PKT_TX_OUTER_UDP_CKSUM flag.
> - * c) Set the PKT_TX_OUTER_IPV4 or PKT_TX_OUTER_IPV6 flag.
> - * 2) Configure DEV_TX_OFFLOAD_OUTER_UDP_CKSUM offload flag.
> - */
> -#define PKT_TX_OUTER_UDP_CKSUM     (1ULL << 41)
> -
> -/**
> - * UDP Fragmentation Offload flag. This flag is used for enabling UDP
> - * fragmentation in SW or in HW. When use UFO, mbuf->tso_segsz is used
> - * to store the MSS of UDP fragments.
> - */
> -#define PKT_TX_UDP_SEG	(1ULL << 42)
> -
> -/**
> - * Request security offload processing on the TX packet.
> - */
> -#define PKT_TX_SEC_OFFLOAD 		(1ULL << 43)
> -
> -/**
> - * Offload the MACsec. This flag must be set by the application to enable
> - * this offload feature for a packet to be transmitted.
> - */
> -#define PKT_TX_MACSEC        (1ULL << 44)
> -
> -/**
> - * Bits 45:48 used for the tunnel type.
> - * The tunnel type must be specified for TSO or checksum on the inner part
> - * of tunnel packets.
> - * These flags can be used with PKT_TX_TCP_SEG for TSO, or PKT_TX_xxx_CKSUM.
> - * The mbuf fields for inner and outer header lengths are required:
> - * outer_l2_len, outer_l3_len, l2_len, l3_len, l4_len and tso_segsz for TSO.
> - */
> -#define PKT_TX_TUNNEL_VXLAN   (0x1ULL << 45)
> -#define PKT_TX_TUNNEL_GRE     (0x2ULL << 45)
> -#define PKT_TX_TUNNEL_IPIP    (0x3ULL << 45)
> -#define PKT_TX_TUNNEL_GENEVE  (0x4ULL << 45)
> -/** TX packet with MPLS-in-UDP RFC 7510 header. */
> -#define PKT_TX_TUNNEL_MPLSINUDP (0x5ULL << 45)
> -#define PKT_TX_TUNNEL_VXLAN_GPE (0x6ULL << 45)
> -/**
> - * Generic IP encapsulated tunnel type, used for TSO and checksum offload.
> - * It can be used for tunnels which are not standards or listed above.
> - * It is preferred to use specific tunnel flags like PKT_TX_TUNNEL_GRE
> - * or PKT_TX_TUNNEL_IPIP if possible.
> - * The ethdev must be configured with DEV_TX_OFFLOAD_IP_TNL_TSO.
> - * Outer and inner checksums are done according to the existing flags like
> - * PKT_TX_xxx_CKSUM.
> - * Specific tunnel headers that contain payload length, sequence id
> - * or checksum are not expected to be updated.
> - */
> -#define PKT_TX_TUNNEL_IP (0xDULL << 45)
> -/**
> - * Generic UDP encapsulated tunnel type, used for TSO and checksum offload.
> - * UDP tunnel type implies outer IP layer.
> - * It can be used for tunnels which are not standards or listed above.
> - * It is preferred to use specific tunnel flags like PKT_TX_TUNNEL_VXLAN
> - * if possible.
> - * The ethdev must be configured with DEV_TX_OFFLOAD_UDP_TNL_TSO.
> - * Outer and inner checksums are done according to the existing flags like
> - * PKT_TX_xxx_CKSUM.
> - * Specific tunnel headers that contain payload length, sequence id
> - * or checksum are not expected to be updated.
> - */
> -#define PKT_TX_TUNNEL_UDP (0xEULL << 45)
> -/* add new TX TUNNEL type here */
> -#define PKT_TX_TUNNEL_MASK    (0xFULL << 45)
> -
> -/**
> - * Double VLAN insertion (QinQ) request to driver, driver may offload the
> - * insertion based on device capability.
> - * mbuf 'vlan_tci' & 'vlan_tci_outer' must be valid when this flag is set.
> - */
> -#define PKT_TX_QINQ        (1ULL << 49)
> -/* this old name is deprecated */
> -#define PKT_TX_QINQ_PKT    PKT_TX_QINQ
> -
> -/**
> - * TCP segmentation offload. To enable this offload feature for a
> - * packet to be transmitted on hardware supporting TSO:
> - *  - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
> - *    PKT_TX_TCP_CKSUM)
> - *  - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
> - *  - if it's IPv4, set the PKT_TX_IP_CKSUM flag
> - *  - fill the mbuf offload information: l2_len, l3_len, l4_len, tso_segsz
> - */
> -#define PKT_TX_TCP_SEG       (1ULL << 50)
> -
> -#define PKT_TX_IEEE1588_TMST (1ULL << 51) /**< TX IEEE1588 packet to timestamp. */
> -
> -/**
> - * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
> - * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
> - * L4 checksum offload, the user needs to:
> - *  - fill l2_len and l3_len in mbuf
> - *  - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
> - *  - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
> - */
> -#define PKT_TX_L4_NO_CKSUM   (0ULL << 52) /**< Disable L4 cksum of TX pkt. */
> -#define PKT_TX_TCP_CKSUM     (1ULL << 52) /**< TCP cksum of TX pkt. computed by NIC. */
> -#define PKT_TX_SCTP_CKSUM    (2ULL << 52) /**< SCTP cksum of TX pkt. computed by NIC. */
> -#define PKT_TX_UDP_CKSUM     (3ULL << 52) /**< UDP cksum of TX pkt. computed by NIC. */
> -#define PKT_TX_L4_MASK       (3ULL << 52) /**< Mask for L4 cksum offload request. */
> -
> -/**
> - * Offload the IP checksum in the hardware. The flag PKT_TX_IPV4 should
> - * also be set by the application, although a PMD will only check
> - * PKT_TX_IP_CKSUM.
> - *  - fill the mbuf offload information: l2_len, l3_len
> - */
> -#define PKT_TX_IP_CKSUM      (1ULL << 54)
> -
> -/**
> - * Packet is IPv4. This flag must be set when using any offload feature
> - * (TSO, L3 or L4 checksum) to tell the NIC that the packet is an IPv4
> - * packet. If the packet is a tunneled packet, this flag is related to
> - * the inner headers.
> - */
> -#define PKT_TX_IPV4          (1ULL << 55)
> -
> -/**
> - * Packet is IPv6. This flag must be set when using an offload feature
> - * (TSO or L4 checksum) to tell the NIC that the packet is an IPv6
> - * packet. If the packet is a tunneled packet, this flag is related to
> - * the inner headers.
> - */
> -#define PKT_TX_IPV6          (1ULL << 56)
> -
> -/**
> - * VLAN tag insertion request to driver, driver may offload the insertion
> - * based on the device capability.
> - * mbuf 'vlan_tci' field must be valid when this flag is set.
> - */
> -#define PKT_TX_VLAN          (1ULL << 57)
> -/* this old name is deprecated */
> -#define PKT_TX_VLAN_PKT      PKT_TX_VLAN
> -
> -/**
> - * Offload the IP checksum of an external header in the hardware. The
> - * flag PKT_TX_OUTER_IPV4 should also be set by the application, although
> - * a PMD will only check PKT_TX_OUTER_IP_CKSUM.
> - *  - fill the mbuf offload information: outer_l2_len, outer_l3_len
> - */
> -#define PKT_TX_OUTER_IP_CKSUM   (1ULL << 58)
> -
> -/**
> - * Packet outer header is IPv4. This flag must be set when using any
> - * outer offload feature (L3 or L4 checksum) to tell the NIC that the
> - * outer header of the tunneled packet is an IPv4 packet.
> - */
> -#define PKT_TX_OUTER_IPV4   (1ULL << 59)
> -
> -/**
> - * Packet outer header is IPv6. This flag must be set when using any
> - * outer offload feature (L4 checksum) to tell the NIC that the outer
> - * header of the tunneled packet is an IPv6 packet.
> - */
> -#define PKT_TX_OUTER_IPV6    (1ULL << 60)
> -
> -/**
> - * Bitmask of all supported packet Tx offload features flags,
> - * which can be set for packet.
> - */
> -#define PKT_TX_OFFLOAD_MASK (    \
> -		PKT_TX_OUTER_IPV6 |	 \
> -		PKT_TX_OUTER_IPV4 |	 \
> -		PKT_TX_OUTER_IP_CKSUM |  \
> -		PKT_TX_VLAN_PKT |        \
> -		PKT_TX_IPV6 |		 \
> -		PKT_TX_IPV4 |		 \
> -		PKT_TX_IP_CKSUM |        \
> -		PKT_TX_L4_MASK |         \
> -		PKT_TX_IEEE1588_TMST |	 \
> -		PKT_TX_TCP_SEG |         \
> -		PKT_TX_QINQ_PKT |        \
> -		PKT_TX_TUNNEL_MASK |	 \
> -		PKT_TX_MACSEC |		 \
> -		PKT_TX_SEC_OFFLOAD |	 \
> -		PKT_TX_UDP_SEG |	 \
> -		PKT_TX_OUTER_UDP_CKSUM | \
> -		PKT_TX_METADATA)
> -
> -/**
> - * Mbuf having an external buffer attached. shinfo in mbuf must be filled.
> - */
> -#define EXT_ATTACHED_MBUF    (1ULL << 61)
> -
> -#define IND_ATTACHED_MBUF    (1ULL << 62) /**< Indirect attached mbuf */
> -
> -/** Alignment constraint of mbuf private area. */
> -#define RTE_MBUF_PRIV_ALIGN 8
> -
>   /**
>    * Get the name of a RX offload flag
>    *
> @@ -453,310 +98,6 @@ const char *rte_get_tx_ol_flag_name(uint64_t mask);
>    */
>   int rte_get_tx_ol_flag_list(uint64_t mask, char *buf, size_t buflen);
>   
> -/**
> - * Some NICs need at least 2KB buffer to RX standard Ethernet frame without
> - * splitting it into multiple segments.
> - * So, for mbufs that planned to be involved into RX/TX, the recommended
> - * minimal buffer length is 2KB + RTE_PKTMBUF_HEADROOM.
> - */
> -#define	RTE_MBUF_DEFAULT_DATAROOM	2048
> -#define	RTE_MBUF_DEFAULT_BUF_SIZE	\
> -	(RTE_MBUF_DEFAULT_DATAROOM + RTE_PKTMBUF_HEADROOM)
> -
> -/* define a set of marker types that can be used to refer to set points in the
> - * mbuf */
> -__extension__
> -typedef void    *MARKER[0];   /**< generic marker for a point in a structure */
> -__extension__
> -typedef uint8_t  MARKER8[0];  /**< generic marker with 1B alignment */
> -__extension__
> -typedef uint64_t MARKER64[0]; /**< marker that allows us to overwrite 8 bytes
> -                               * with a single assignment */
> -
> -struct rte_mbuf_sched {
> -	uint32_t queue_id;   /**< Queue ID. */
> -	uint8_t traffic_class;
> -	/**< Traffic class ID. Traffic class 0
> -	 * is the highest priority traffic class.
> -	 */
> -	uint8_t color;
> -	/**< Color. @see enum rte_color.*/
> -	uint16_t reserved;   /**< Reserved. */
> -}; /**< Hierarchical scheduler */
> -
> -/**
> - * enum for the tx_offload bit-fields lengths and offsets.
> - * defines the layout of rte_mbuf tx_offload field.
> - */
> -enum {
> -	RTE_MBUF_L2_LEN_BITS = 7,
> -	RTE_MBUF_L3_LEN_BITS = 9,
> -	RTE_MBUF_L4_LEN_BITS = 8,
> -	RTE_MBUF_TSO_SEGSZ_BITS = 16,
> -	RTE_MBUF_OUTL3_LEN_BITS = 9,
> -	RTE_MBUF_OUTL2_LEN_BITS = 7,
> -	RTE_MBUF_TXOFLD_UNUSED_BITS = sizeof(uint64_t) * CHAR_BIT -
> -		RTE_MBUF_L2_LEN_BITS -
> -		RTE_MBUF_L3_LEN_BITS -
> -		RTE_MBUF_L4_LEN_BITS -
> -		RTE_MBUF_TSO_SEGSZ_BITS -
> -		RTE_MBUF_OUTL3_LEN_BITS -
> -		RTE_MBUF_OUTL2_LEN_BITS,
> -#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
> -	RTE_MBUF_L2_LEN_OFS =
> -		sizeof(uint64_t) * CHAR_BIT - RTE_MBUF_L2_LEN_BITS,
> -	RTE_MBUF_L3_LEN_OFS = RTE_MBUF_L2_LEN_OFS - RTE_MBUF_L3_LEN_BITS,
> -	RTE_MBUF_L4_LEN_OFS = RTE_MBUF_L3_LEN_OFS - RTE_MBUF_L4_LEN_BITS,
> -	RTE_MBUF_TSO_SEGSZ_OFS = RTE_MBUF_L4_LEN_OFS - RTE_MBUF_TSO_SEGSZ_BITS,
> -	RTE_MBUF_OUTL3_LEN_OFS =
> -		RTE_MBUF_TSO_SEGSZ_OFS - RTE_MBUF_OUTL3_LEN_BITS,
> -	RTE_MBUF_OUTL2_LEN_OFS =
> -		RTE_MBUF_OUTL3_LEN_OFS - RTE_MBUF_OUTL2_LEN_BITS,
> -	RTE_MBUF_TXOFLD_UNUSED_OFS =
> -		RTE_MBUF_OUTL2_LEN_OFS - RTE_MBUF_TXOFLD_UNUSED_BITS,
> -#else
> -	RTE_MBUF_L2_LEN_OFS = 0,
> -	RTE_MBUF_L3_LEN_OFS = RTE_MBUF_L2_LEN_OFS + RTE_MBUF_L2_LEN_BITS,
> -	RTE_MBUF_L4_LEN_OFS = RTE_MBUF_L3_LEN_OFS + RTE_MBUF_L3_LEN_BITS,
> -	RTE_MBUF_TSO_SEGSZ_OFS = RTE_MBUF_L4_LEN_OFS + RTE_MBUF_L4_LEN_BITS,
> -	RTE_MBUF_OUTL3_LEN_OFS =
> -		RTE_MBUF_TSO_SEGSZ_OFS + RTE_MBUF_TSO_SEGSZ_BITS,
> -	RTE_MBUF_OUTL2_LEN_OFS =
> -		RTE_MBUF_OUTL3_LEN_OFS + RTE_MBUF_OUTL3_LEN_BITS,
> -	RTE_MBUF_TXOFLD_UNUSED_OFS =
> -		RTE_MBUF_OUTL2_LEN_OFS + RTE_MBUF_OUTL2_LEN_BITS,
> -#endif
> -};
> -
> -/**
> - * The generic rte_mbuf, containing a packet mbuf.
> - */
> -struct rte_mbuf {
> -	MARKER cacheline0;
> -
> -	void *buf_addr;           /**< Virtual address of segment buffer. */
> -	/**
> -	 * Physical address of segment buffer.
> -	 * Force alignment to 8-bytes, so as to ensure we have the exact
> -	 * same mbuf cacheline0 layout for 32-bit and 64-bit. This makes
> -	 * working on vector drivers easier.
> -	 */
> -	RTE_STD_C11
> -	union {
> -		rte_iova_t buf_iova;
> -		rte_iova_t buf_physaddr; /**< deprecated */
> -	} __rte_aligned(sizeof(rte_iova_t));
> -
> -	/* next 8 bytes are initialised on RX descriptor rearm */
> -	MARKER64 rearm_data;
> -	uint16_t data_off;
> -
> -	/**
> -	 * Reference counter. Its size should at least equal to the size
> -	 * of port field (16 bits), to support zero-copy broadcast.
> -	 * It should only be accessed using the following functions:
> -	 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
> -	 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
> -	 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
> -	 * config option.
> -	 */
> -	RTE_STD_C11
> -	union {
> -		rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
> -		uint16_t refcnt;              /**< Non-atomically accessed refcnt */
> -	};
> -	uint16_t nb_segs;         /**< Number of segments. */
> -
> -	/** Input port (16 bits to support more than 256 virtual ports).
> -	 * The event eth Tx adapter uses this field to specify the output port.
> -	 */
> -	uint16_t port;
> -
> -	uint64_t ol_flags;        /**< Offload features. */
> -
> -	/* remaining bytes are set on RX when pulling packet from descriptor */
> -	MARKER rx_descriptor_fields1;
> -
> -	/*
> -	 * The packet type, which is the combination of outer/inner L2, L3, L4
> -	 * and tunnel types. The packet_type is about data really present in the
> -	 * mbuf. Example: if vlan stripping is enabled, a received vlan packet
> -	 * would have RTE_PTYPE_L2_ETHER and not RTE_PTYPE_L2_VLAN because the
> -	 * vlan is stripped from the data.
> -	 */
> -	RTE_STD_C11
> -	union {
> -		uint32_t packet_type; /**< L2/L3/L4 and tunnel information. */
> -		struct {
> -			uint32_t l2_type:4; /**< (Outer) L2 type. */
> -			uint32_t l3_type:4; /**< (Outer) L3 type. */
> -			uint32_t l4_type:4; /**< (Outer) L4 type. */
> -			uint32_t tun_type:4; /**< Tunnel type. */
> -			RTE_STD_C11
> -			union {
> -				uint8_t inner_esp_next_proto;
> -				/**< ESP next protocol type, valid if
> -				 * RTE_PTYPE_TUNNEL_ESP tunnel type is set
> -				 * on both Tx and Rx.
> -				 */
> -				__extension__
> -				struct {
> -					uint8_t inner_l2_type:4;
> -					/**< Inner L2 type. */
> -					uint8_t inner_l3_type:4;
> -					/**< Inner L3 type. */
> -				};
> -			};
> -			uint32_t inner_l4_type:4; /**< Inner L4 type. */
> -		};
> -	};
> -
> -	uint32_t pkt_len;         /**< Total pkt len: sum of all segments. */
> -	uint16_t data_len;        /**< Amount of data in segment buffer. */
> -	/** VLAN TCI (CPU order), valid if PKT_RX_VLAN is set. */
> -	uint16_t vlan_tci;
> -
> -	RTE_STD_C11
> -	union {
> -		union {
> -			uint32_t rss;     /**< RSS hash result if RSS enabled */
> -			struct {
> -				union {
> -					struct {
> -						uint16_t hash;
> -						uint16_t id;
> -					};
> -					uint32_t lo;
> -					/**< Second 4 flexible bytes */
> -				};
> -				uint32_t hi;
> -				/**< First 4 flexible bytes or FD ID, dependent
> -				 * on PKT_RX_FDIR_* flag in ol_flags.
> -				 */
> -			} fdir;	/**< Filter identifier if FDIR enabled */
> -			struct rte_mbuf_sched sched;
> -			/**< Hierarchical scheduler : 8 bytes */
> -			struct {
> -				uint32_t reserved1;
> -				uint16_t reserved2;
> -				uint16_t txq;
> -				/**< The event eth Tx adapter uses this field
> -				 * to store Tx queue id.
> -				 * @see rte_event_eth_tx_adapter_txq_set()
> -				 */
> -			} txadapter; /**< Eventdev ethdev Tx adapter */
> -			/**< User defined tags. See rte_distributor_process() */
> -			uint32_t usr;
> -		} hash;                   /**< hash information */
> -		struct {
> -			/**
> -			 * Application specific metadata value
> -			 * for egress flow rule match.
> -			 * Valid if PKT_TX_METADATA is set.
> -			 * Located here to allow conjunct use
> -			 * with hash.sched.hi.
> -			 */
> -			uint32_t tx_metadata;
> -			uint32_t reserved;
> -		};
> -	};
> -
> -	/** Outer VLAN TCI (CPU order), valid if PKT_RX_QINQ is set. */
> -	uint16_t vlan_tci_outer;
> -
> -	uint16_t buf_len;         /**< Length of segment buffer. */
> -
> -	/** Valid if PKT_RX_TIMESTAMP is set. The unit and time reference
> -	 * are not normalized but are always the same for a given port.
> -	 * Some devices allow to query rte_eth_read_clock that will return the
> -	 * current device timestamp.
> -	 */
> -	uint64_t timestamp;
> -
> -	/* second cache line - fields only used in slow path or on TX */
> -	MARKER cacheline1 __rte_cache_min_aligned;
> -
> -	RTE_STD_C11
> -	union {
> -		void *userdata;   /**< Can be used for external metadata */
> -		uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
> -	};
> -
> -	struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
> -	struct rte_mbuf *next;    /**< Next segment of scattered packet. */
> -
> -	/* fields to support TX offloads */
> -	RTE_STD_C11
> -	union {
> -		uint64_t tx_offload;       /**< combined for easy fetch */
> -		__extension__
> -		struct {
> -			uint64_t l2_len:RTE_MBUF_L2_LEN_BITS;
> -			/**< L2 (MAC) Header Length for non-tunneling pkt.
> -			 * Outer_L4_len + ... + Inner_L2_len for tunneling pkt.
> -			 */
> -			uint64_t l3_len:RTE_MBUF_L3_LEN_BITS;
> -			/**< L3 (IP) Header Length. */
> -			uint64_t l4_len:RTE_MBUF_L4_LEN_BITS;
> -			/**< L4 (TCP/UDP) Header Length. */
> -			uint64_t tso_segsz:RTE_MBUF_TSO_SEGSZ_BITS;
> -			/**< TCP TSO segment size */
> -
> -			/*
> -			 * Fields for Tx offloading of tunnels.
> -			 * These are undefined for packets which don't request
> -			 * any tunnel offloads (outer IP or UDP checksum,
> -			 * tunnel TSO).
> -			 *
> -			 * PMDs should not use these fields unconditionally
> -			 * when calculating offsets.
> -			 *
> -			 * Applications are expected to set appropriate tunnel
> -			 * offload flags when they fill in these fields.
> -			 */
> -			uint64_t outer_l3_len:RTE_MBUF_OUTL3_LEN_BITS;
> -			/**< Outer L3 (IP) Hdr Length. */
> -			uint64_t outer_l2_len:RTE_MBUF_OUTL2_LEN_BITS;
> -			/**< Outer L2 (MAC) Hdr Length. */
> -
> -			/* uint64_t unused:RTE_MBUF_TXOFLD_UNUSED_BITS; */
> -		};
> -	};
> -
> -	/** Size of the application private data. In case of an indirect
> -	 * mbuf, it stores the direct mbuf private data size. */
> -	uint16_t priv_size;
> -
> -	/** Timesync flags for use with IEEE1588. */
> -	uint16_t timesync;
> -
> -	/** Sequence number. See also rte_reorder_insert(). */
> -	uint32_t seqn;
> -
> -	/** Shared data for external buffer attached to mbuf. See
> -	 * rte_pktmbuf_attach_extbuf().
> -	 */
> -	struct rte_mbuf_ext_shared_info *shinfo;
> -
> -} __rte_cache_aligned;
> -
> -/**
> - * Function typedef of callback to free externally attached buffer.
> - */
> -typedef void (*rte_mbuf_extbuf_free_callback_t)(void *addr, void *opaque);
> -
> -/**
> - * Shared data at the end of an external buffer.
> - */
> -struct rte_mbuf_ext_shared_info {
> -	rte_mbuf_extbuf_free_callback_t free_cb; /**< Free callback function */
> -	void *fcb_opaque;                        /**< Free callback argument */
> -	rte_atomic16_t refcnt_atomic;        /**< Atomically accessed refcnt */
> -};
> -
> -/**< Maximum number of nb_segs allowed. */
> -#define RTE_MBUF_MAX_NB_SEGS	UINT16_MAX
> -
>   /**
>    * Prefetch the first part of the mbuf
>    *
> @@ -953,31 +294,6 @@ rte_mbuf_to_priv(struct rte_mbuf *m)
>   	return RTE_PTR_ADD(m, sizeof(struct rte_mbuf));
>   }
>   
> -/**
> - * Returns TRUE if given mbuf is cloned by mbuf indirection, or FALSE
> - * otherwise.
> - *
> - * If a mbuf has its data in another mbuf and references it by mbuf
> - * indirection, this mbuf can be defined as a cloned mbuf.
> - */
> -#define RTE_MBUF_CLONED(mb)     ((mb)->ol_flags & IND_ATTACHED_MBUF)
> -
> -/**
> - * Returns TRUE if given mbuf has an external buffer, or FALSE otherwise.
> - *
> - * External buffer is a user-provided anonymous buffer.
> - */
> -#define RTE_MBUF_HAS_EXTBUF(mb) ((mb)->ol_flags & EXT_ATTACHED_MBUF)
> -
> -/**
> - * Returns TRUE if given mbuf is direct, or FALSE otherwise.
> - *
> - * If a mbuf embeds its own data after the rte_mbuf structure, this mbuf
> - * can be defined as a direct mbuf.
> - */
> -#define RTE_MBUF_DIRECT(mb) \
> -	(!((mb)->ol_flags & (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF)))
> -
>   /**
>    * Private data in case of pktmbuf pool.
>    *
> @@ -2026,62 +1342,10 @@ static inline struct rte_mbuf *rte_pktmbuf_lastseg(struct rte_mbuf *m)
>   	return m;
>   }
>   
> -/**
> - * A macro that points to an offset into the data in the mbuf.
> - *
> - * The returned pointer is cast to type t. Before using this
> - * function, the user must ensure that the first segment is large
> - * enough to accommodate its data.
> - *
> - * @param m
> - *   The packet mbuf.
> - * @param o
> - *   The offset into the mbuf data.
> - * @param t
> - *   The type to cast the result into.
> - */
> -#define rte_pktmbuf_mtod_offset(m, t, o)	\
> -	((t)((char *)(m)->buf_addr + (m)->data_off + (o)))
> -
> -/**
> - * A macro that points to the start of the data in the mbuf.
> - *
> - * The returned pointer is cast to type t. Before using this
> - * function, the user must ensure that the first segment is large
> - * enough to accommodate its data.
> - *
> - * @param m
> - *   The packet mbuf.
> - * @param t
> - *   The type to cast the result into.
> - */
> -#define rte_pktmbuf_mtod(m, t) rte_pktmbuf_mtod_offset(m, t, 0)
> -
> -/**
> - * A macro that returns the IO address that points to an offset of the
> - * start of the data in the mbuf
> - *
> - * @param m
> - *   The packet mbuf.
> - * @param o
> - *   The offset into the data to calculate address from.
> - */
> -#define rte_pktmbuf_iova_offset(m, o) \
> -	(rte_iova_t)((m)->buf_iova + (m)->data_off + (o))
> -
>   /* deprecated */
>   #define rte_pktmbuf_mtophys_offset(m, o) \
>   	rte_pktmbuf_iova_offset(m, o)
>   
> -/**
> - * A macro that returns the IO address that points to the start of the
> - * data in the mbuf
> - *
> - * @param m
> - *   The packet mbuf.
> - */
> -#define rte_pktmbuf_iova(m) rte_pktmbuf_iova_offset(m, 0)
> -
>   /* deprecated */
>   #define rte_pktmbuf_mtophys(m) rte_pktmbuf_iova(m)
>   
> diff --git a/lib/librte_mbuf/rte_mbuf_core.h b/lib/librte_mbuf/rte_mbuf_core.h
> new file mode 100644
> index 000000000..f52272e55
> --- /dev/null
> +++ b/lib/librte_mbuf/rte_mbuf_core.h
> @@ -0,0 +1,793 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2010-2014 Intel Corporation.
> + * Copyright 2014 6WIND S.A.
> + */
> +
> +#ifndef _RTE_MBUF_CORE_H_
> +#define _RTE_MBUF_CORE_H_
> +
> +/**
> + * @file
> + * This file contains definion of RTE mbuf structure itself,
> + * packet offload flags and some related macros.
> + * For majority of DPDK entities, it is not recommended to include
> + * this file directly, use include <rte_mbuf.h> instead.
> + */
> +
> +#include <stdint.h>
> +#include <rte_compat.h>
> +#include <rte_common.h>
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +/*
> + * Packet Offload Features Flags. It also carry packet type information.
> + * Critical resources. Both rx/tx shared these bits. Be cautious on any change
> + *
> + * - RX flags start at bit position zero, and get added to the left of previous
> + *   flags.
> + * - The most-significant 3 bits are reserved for generic mbuf flags
> + * - TX flags therefore start at bit position 60 (i.e. 63-3), and new flags get
> + *   added to the right of the previously defined flags i.e. they should count
> + *   downwards, not upwards.
> + *
> + * Keep these flags synchronized with rte_get_rx_ol_flag_name() and
> + * rte_get_tx_ol_flag_name().
> + */
> +
> +/**
> + * The RX packet is a 802.1q VLAN packet, and the tci has been
> + * saved in in mbuf->vlan_tci.
> + * If the flag PKT_RX_VLAN_STRIPPED is also present, the VLAN
> + * header has been stripped from mbuf data, else it is still
> + * present.
> + */
> +#define PKT_RX_VLAN          (1ULL << 0)
> +
> +/** RX packet with RSS hash result. */
> +#define PKT_RX_RSS_HASH      (1ULL << 1)
> +
> + /** RX packet with FDIR match indicate. */
> +#define PKT_RX_FDIR          (1ULL << 2)
> +
> +/**
> + * Deprecated.
> + * Checking this flag alone is deprecated: check the 2 bits of
> + * PKT_RX_L4_CKSUM_MASK.
> + * This flag was set when the L4 checksum of a packet was detected as
> + * wrong by the hardware.
> + */
> +#define PKT_RX_L4_CKSUM_BAD  (1ULL << 3)
> +
> +/**
> + * Deprecated.
> + * Checking this flag alone is deprecated: check the 2 bits of
> + * PKT_RX_IP_CKSUM_MASK.
> + * This flag was set when the IP checksum of a packet was detected as
> + * wrong by the hardware.
> + */
> +#define PKT_RX_IP_CKSUM_BAD  (1ULL << 4)
> +
> + /** External IP header checksum error. */
> +#define PKT_RX_EIP_CKSUM_BAD (1ULL << 5)
> +
> +/**
> + * A vlan has been stripped by the hardware and its tci is saved in
> + * mbuf->vlan_tci. This can only happen if vlan stripping is enabled
> + * in the RX configuration of the PMD.
> + * When PKT_RX_VLAN_STRIPPED is set, PKT_RX_VLAN must also be set.
> + */
> +#define PKT_RX_VLAN_STRIPPED (1ULL << 6)
> +
> +/**
> + * Mask of bits used to determine the status of RX IP checksum.
> + * - PKT_RX_IP_CKSUM_UNKNOWN: no information about the RX IP checksum
> + * - PKT_RX_IP_CKSUM_BAD: the IP checksum in the packet is wrong
> + * - PKT_RX_IP_CKSUM_GOOD: the IP checksum in the packet is valid
> + * - PKT_RX_IP_CKSUM_NONE: the IP checksum is not correct in the packet
> + *   data, but the integrity of the IP header is verified.
> + */
> +#define PKT_RX_IP_CKSUM_MASK ((1ULL << 4) | (1ULL << 7))
> +
> +#define PKT_RX_IP_CKSUM_UNKNOWN 0
> +#define PKT_RX_IP_CKSUM_BAD     (1ULL << 4)
> +#define PKT_RX_IP_CKSUM_GOOD    (1ULL << 7)
> +#define PKT_RX_IP_CKSUM_NONE    ((1ULL << 4) | (1ULL << 7))
> +
> +/**
> + * Mask of bits used to determine the status of RX L4 checksum.
> + * - PKT_RX_L4_CKSUM_UNKNOWN: no information about the RX L4 checksum
> + * - PKT_RX_L4_CKSUM_BAD: the L4 checksum in the packet is wrong
> + * - PKT_RX_L4_CKSUM_GOOD: the L4 checksum in the packet is valid
> + * - PKT_RX_L4_CKSUM_NONE: the L4 checksum is not correct in the packet
> + *   data, but the integrity of the L4 data is verified.
> + */
> +#define PKT_RX_L4_CKSUM_MASK ((1ULL << 3) | (1ULL << 8))
> +
> +#define PKT_RX_L4_CKSUM_UNKNOWN 0
> +#define PKT_RX_L4_CKSUM_BAD     (1ULL << 3)
> +#define PKT_RX_L4_CKSUM_GOOD    (1ULL << 8)
> +#define PKT_RX_L4_CKSUM_NONE    ((1ULL << 3) | (1ULL << 8))
> +
> +/** RX IEEE1588 L2 Ethernet PT Packet. */
> +#define PKT_RX_IEEE1588_PTP  (1ULL << 9)
> +
> +/** RX IEEE1588 L2/L4 timestamped packet.*/
> +#define PKT_RX_IEEE1588_TMST (1ULL << 10)
> +
> +/** FD id reported if FDIR match. */
> +#define PKT_RX_FDIR_ID       (1ULL << 13)
> +
> +/** Flexible bytes reported if FDIR match. */
> +#define PKT_RX_FDIR_FLX      (1ULL << 14)
> +
> +/**
> + * The 2 vlans have been stripped by the hardware and their tci are
> + * saved in mbuf->vlan_tci (inner) and mbuf->vlan_tci_outer (outer).
> + * This can only happen if vlan stripping is enabled in the RX
> + * configuration of the PMD.
> + * When PKT_RX_QINQ_STRIPPED is set, the flags (PKT_RX_VLAN |
> + * PKT_RX_VLAN_STRIPPED | PKT_RX_QINQ) must also be set.
> + */
> +#define PKT_RX_QINQ_STRIPPED (1ULL << 15)
> +
> +/**
> + * When packets are coalesced by a hardware or virtual driver, this flag
> + * can be set in the RX mbuf, meaning that the m->tso_segsz field is
> + * valid and is set to the segment size of original packets.
> + */
> +#define PKT_RX_LRO           (1ULL << 16)
> +
> +/**
> + * Indicate that the timestamp field in the mbuf is valid.
> + */
> +#define PKT_RX_TIMESTAMP     (1ULL << 17)
> +
> +/**
> + * Indicate that security offload processing was applied on the RX packet.
> + */
> +#define PKT_RX_SEC_OFFLOAD	(1ULL << 18)
> +
> +/**
> + * Indicate that security offload processing failed on the RX packet.
> + */
> +#define PKT_RX_SEC_OFFLOAD_FAILED	(1ULL << 19)
> +
> +/**
> + * The RX packet is a double VLAN, and the outer tci has been
> + * saved in in mbuf->vlan_tci_outer. If PKT_RX_QINQ set, PKT_RX_VLAN
> + * also should be set and inner tci should be saved to mbuf->vlan_tci.
> + * If the flag PKT_RX_QINQ_STRIPPED is also present, both VLANs
> + * headers have been stripped from mbuf data, else they are still
> + * present.
> + */
> +#define PKT_RX_QINQ          (1ULL << 20)
> +
> +/**
> + * Mask of bits used to determine the status of outer RX L4 checksum.
> + * - PKT_RX_OUTER_L4_CKSUM_UNKNOWN: no info about the outer RX L4 checksum
> + * - PKT_RX_OUTER_L4_CKSUM_BAD: the outer L4 checksum in the packet is wrong
> + * - PKT_RX_OUTER_L4_CKSUM_GOOD: the outer L4 checksum in the packet is valid
> + * - PKT_RX_OUTER_L4_CKSUM_INVALID: invalid outer L4 checksum state.
> + *
> + * The detection of PKT_RX_OUTER_L4_CKSUM_GOOD shall be based on the given
> + * HW capability, At minimum, the PMD should support
> + * PKT_RX_OUTER_L4_CKSUM_UNKNOWN and PKT_RX_OUTER_L4_CKSUM_BAD states
> + * if the DEV_RX_OFFLOAD_OUTER_UDP_CKSUM offload is available.
> + */
> +#define PKT_RX_OUTER_L4_CKSUM_MASK	((1ULL << 21) | (1ULL << 22))
> +
> +#define PKT_RX_OUTER_L4_CKSUM_UNKNOWN	0
> +#define PKT_RX_OUTER_L4_CKSUM_BAD	(1ULL << 21)
> +#define PKT_RX_OUTER_L4_CKSUM_GOOD	(1ULL << 22)
> +#define PKT_RX_OUTER_L4_CKSUM_INVALID	((1ULL << 21) | (1ULL << 22))
> +
> +/* add new RX flags here */
> +
> +/* add new TX flags here */
> +
> +/**
> + * Indicate that the metadata field in the mbuf is in use.
> + */
> +#define PKT_TX_METADATA	(1ULL << 40)
> +
> +/**
> + * Outer UDP checksum offload flag. This flag is used for enabling
> + * outer UDP checksum in PMD. To use outer UDP checksum, the user needs to
> + * 1) Enable the following in mbuf,
> + * a) Fill outer_l2_len and outer_l3_len in mbuf.
> + * b) Set the PKT_TX_OUTER_UDP_CKSUM flag.
> + * c) Set the PKT_TX_OUTER_IPV4 or PKT_TX_OUTER_IPV6 flag.
> + * 2) Configure DEV_TX_OFFLOAD_OUTER_UDP_CKSUM offload flag.
> + */
> +#define PKT_TX_OUTER_UDP_CKSUM     (1ULL << 41)
> +
> +/**
> + * UDP Fragmentation Offload flag. This flag is used for enabling UDP
> + * fragmentation in SW or in HW. When use UFO, mbuf->tso_segsz is used
> + * to store the MSS of UDP fragments.
> + */
> +#define PKT_TX_UDP_SEG	(1ULL << 42)
> +
> +/**
> + * Request security offload processing on the TX packet.
> + */
> +#define PKT_TX_SEC_OFFLOAD	(1ULL << 43)
> +
> +/**
> + * Offload the MACsec. This flag must be set by the application to enable
> + * this offload feature for a packet to be transmitted.
> + */
> +#define PKT_TX_MACSEC        (1ULL << 44)
> +
> +/**
> + * Bits 45:48 used for the tunnel type.
> + * The tunnel type must be specified for TSO or checksum on the inner part
> + * of tunnel packets.
> + * These flags can be used with PKT_TX_TCP_SEG for TSO, or PKT_TX_xxx_CKSUM.
> + * The mbuf fields for inner and outer header lengths are required:
> + * outer_l2_len, outer_l3_len, l2_len, l3_len, l4_len and tso_segsz for TSO.
> + */
> +#define PKT_TX_TUNNEL_VXLAN   (0x1ULL << 45)
> +#define PKT_TX_TUNNEL_GRE     (0x2ULL << 45)
> +#define PKT_TX_TUNNEL_IPIP    (0x3ULL << 45)
> +#define PKT_TX_TUNNEL_GENEVE  (0x4ULL << 45)
> +/** TX packet with MPLS-in-UDP RFC 7510 header. */
> +#define PKT_TX_TUNNEL_MPLSINUDP (0x5ULL << 45)
> +#define PKT_TX_TUNNEL_VXLAN_GPE (0x6ULL << 45)
> +/**
> + * Generic IP encapsulated tunnel type, used for TSO and checksum offload.
> + * It can be used for tunnels which are not standards or listed above.
> + * It is preferred to use specific tunnel flags like PKT_TX_TUNNEL_GRE
> + * or PKT_TX_TUNNEL_IPIP if possible.
> + * The ethdev must be configured with DEV_TX_OFFLOAD_IP_TNL_TSO.
> + * Outer and inner checksums are done according to the existing flags like
> + * PKT_TX_xxx_CKSUM.
> + * Specific tunnel headers that contain payload length, sequence id
> + * or checksum are not expected to be updated.
> + */
> +#define PKT_TX_TUNNEL_IP (0xDULL << 45)
> +/**
> + * Generic UDP encapsulated tunnel type, used for TSO and checksum offload.
> + * UDP tunnel type implies outer IP layer.
> + * It can be used for tunnels which are not standards or listed above.
> + * It is preferred to use specific tunnel flags like PKT_TX_TUNNEL_VXLAN
> + * if possible.
> + * The ethdev must be configured with DEV_TX_OFFLOAD_UDP_TNL_TSO.
> + * Outer and inner checksums are done according to the existing flags like
> + * PKT_TX_xxx_CKSUM.
> + * Specific tunnel headers that contain payload length, sequence id
> + * or checksum are not expected to be updated.
> + */
> +#define PKT_TX_TUNNEL_UDP (0xEULL << 45)
> +/* add new TX TUNNEL type here */
> +#define PKT_TX_TUNNEL_MASK    (0xFULL << 45)
> +
> +/**
> + * Double VLAN insertion (QinQ) request to driver, driver may offload the
> + * insertion based on device capability.
> + * mbuf 'vlan_tci' & 'vlan_tci_outer' must be valid when this flag is set.
> + */
> +#define PKT_TX_QINQ        (1ULL << 49)
> +/* this old name is deprecated */
> +#define PKT_TX_QINQ_PKT    PKT_TX_QINQ
> +
> +/**
> + * TCP segmentation offload. To enable this offload feature for a
> + * packet to be transmitted on hardware supporting TSO:
> + *  - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
> + *    PKT_TX_TCP_CKSUM)
> + *  - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
> + *  - if it's IPv4, set the PKT_TX_IP_CKSUM flag
> + *  - fill the mbuf offload information: l2_len, l3_len, l4_len, tso_segsz
> + */
> +#define PKT_TX_TCP_SEG       (1ULL << 50)
> +
> +/** TX IEEE1588 packet to timestamp. */
> +#define PKT_TX_IEEE1588_TMST (1ULL << 51)
> +
> +/**
> + * Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
> + * 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
> + * L4 checksum offload, the user needs to:
> + *  - fill l2_len and l3_len in mbuf
> + *  - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
> + *  - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
> + */
> +#define PKT_TX_L4_NO_CKSUM   (0ULL << 52) /**< Disable L4 cksum of TX pkt. */
> +
> +/** TCP cksum of TX pkt. computed by NIC. */
> +#define PKT_TX_TCP_CKSUM     (1ULL << 52)
> +
> +/** SCTP cksum of TX pkt. computed by NIC. */
> +#define PKT_TX_SCTP_CKSUM    (2ULL << 52)
> +
> +/** UDP cksum of TX pkt. computed by NIC. */
> +#define PKT_TX_UDP_CKSUM     (3ULL << 52)
> +
> +/** Mask for L4 cksum offload request. */
> +#define PKT_TX_L4_MASK       (3ULL << 52)
> +
> +/**
> + * Offload the IP checksum in the hardware. The flag PKT_TX_IPV4 should
> + * also be set by the application, although a PMD will only check
> + * PKT_TX_IP_CKSUM.
> + *  - fill the mbuf offload information: l2_len, l3_len
> + */
> +#define PKT_TX_IP_CKSUM      (1ULL << 54)
> +
> +/**
> + * Packet is IPv4. This flag must be set when using any offload feature
> + * (TSO, L3 or L4 checksum) to tell the NIC that the packet is an IPv4
> + * packet. If the packet is a tunneled packet, this flag is related to
> + * the inner headers.
> + */
> +#define PKT_TX_IPV4          (1ULL << 55)
> +
> +/**
> + * Packet is IPv6. This flag must be set when using an offload feature
> + * (TSO or L4 checksum) to tell the NIC that the packet is an IPv6
> + * packet. If the packet is a tunneled packet, this flag is related to
> + * the inner headers.
> + */
> +#define PKT_TX_IPV6          (1ULL << 56)
> +
> +/**
> + * VLAN tag insertion request to driver, driver may offload the insertion
> + * based on the device capability.
> + * mbuf 'vlan_tci' field must be valid when this flag is set.
> + */
> +#define PKT_TX_VLAN          (1ULL << 57)
> +/* this old name is deprecated */
> +#define PKT_TX_VLAN_PKT      PKT_TX_VLAN
> +
> +/**
> + * Offload the IP checksum of an external header in the hardware. The
> + * flag PKT_TX_OUTER_IPV4 should also be set by the application, although
> + * a PMD will only check PKT_TX_OUTER_IP_CKSUM.
> + *  - fill the mbuf offload information: outer_l2_len, outer_l3_len
> + */
> +#define PKT_TX_OUTER_IP_CKSUM   (1ULL << 58)
> +
> +/**
> + * Packet outer header is IPv4. This flag must be set when using any
> + * outer offload feature (L3 or L4 checksum) to tell the NIC that the
> + * outer header of the tunneled packet is an IPv4 packet.
> + */
> +#define PKT_TX_OUTER_IPV4   (1ULL << 59)
> +
> +/**
> + * Packet outer header is IPv6. This flag must be set when using any
> + * outer offload feature (L4 checksum) to tell the NIC that the outer
> + * header of the tunneled packet is an IPv6 packet.
> + */
> +#define PKT_TX_OUTER_IPV6    (1ULL << 60)
> +
> +/**
> + * Bitmask of all supported packet Tx offload features flags,
> + * which can be set for packet.
> + */
> +#define PKT_TX_OFFLOAD_MASK (    \
> +		PKT_TX_OUTER_IPV6 |	 \
> +		PKT_TX_OUTER_IPV4 |	 \
> +		PKT_TX_OUTER_IP_CKSUM |  \
> +		PKT_TX_VLAN_PKT |        \
> +		PKT_TX_IPV6 |		 \
> +		PKT_TX_IPV4 |		 \
> +		PKT_TX_IP_CKSUM |        \
> +		PKT_TX_L4_MASK |         \
> +		PKT_TX_IEEE1588_TMST |	 \
> +		PKT_TX_TCP_SEG |         \
> +		PKT_TX_QINQ_PKT |        \
> +		PKT_TX_TUNNEL_MASK |	 \
> +		PKT_TX_MACSEC |		 \
> +		PKT_TX_SEC_OFFLOAD |	 \
> +		PKT_TX_UDP_SEG |	 \
> +		PKT_TX_OUTER_UDP_CKSUM | \
> +		PKT_TX_METADATA)
> +
> +/**
> + * Mbuf having an external buffer attached. shinfo in mbuf must be filled.
> + */
> +#define EXT_ATTACHED_MBUF    (1ULL << 61)
> +
> +#define IND_ATTACHED_MBUF    (1ULL << 62) /**< Indirect attached mbuf */
> +
> +/** Alignment constraint of mbuf private area. */
> +#define RTE_MBUF_PRIV_ALIGN 8
> +
> +/**
> + * Some NICs need at least 2KB buffer to RX standard Ethernet frame without
> + * splitting it into multiple segments.
> + * So, for mbufs that planned to be involved into RX/TX, the recommended
> + * minimal buffer length is 2KB + RTE_PKTMBUF_HEADROOM.
> + */
> +#define	RTE_MBUF_DEFAULT_DATAROOM	2048
> +#define	RTE_MBUF_DEFAULT_BUF_SIZE	\
> +	(RTE_MBUF_DEFAULT_DATAROOM + RTE_PKTMBUF_HEADROOM)
> +
> +/*
> + * define a set of marker types that can be used to refer to set points in the
> + * mbuf.
> + */
> +__extension__
> +typedef void    *MARKER[0];   /**< generic marker for a point in a structure */
> +__extension__
> +typedef uint8_t  MARKER8[0];  /**< generic marker with 1B alignment */
> +
> + /** marker that allows us to overwrite 8 bytes with a single assignment */
> +__extension__
> +typedef uint64_t MARKER64[0];
> +
> +struct rte_mbuf_sched {
> +	uint32_t queue_id;   /**< Queue ID. */
> +	uint8_t traffic_class;
> +	/**< Traffic class ID. Traffic class 0
> +	 * is the highest priority traffic class.
> +	 */
> +	uint8_t color;
> +	/**< Color. @see enum rte_color.*/
> +	uint16_t reserved;   /**< Reserved. */
> +}; /**< Hierarchical scheduler */
> +
> +/**
> + * enum for the tx_offload bit-fields lengths and offsets.
> + * defines the layout of rte_mbuf tx_offload field.
> + */
> +enum {
> +	RTE_MBUF_L2_LEN_BITS = 7,
> +	RTE_MBUF_L3_LEN_BITS = 9,
> +	RTE_MBUF_L4_LEN_BITS = 8,
> +	RTE_MBUF_TSO_SEGSZ_BITS = 16,
> +	RTE_MBUF_OUTL3_LEN_BITS = 9,
> +	RTE_MBUF_OUTL2_LEN_BITS = 7,
> +	RTE_MBUF_TXOFLD_UNUSED_BITS = sizeof(uint64_t) * CHAR_BIT -
> +		RTE_MBUF_L2_LEN_BITS -
> +		RTE_MBUF_L3_LEN_BITS -
> +		RTE_MBUF_L4_LEN_BITS -
> +		RTE_MBUF_TSO_SEGSZ_BITS -
> +		RTE_MBUF_OUTL3_LEN_BITS -
> +		RTE_MBUF_OUTL2_LEN_BITS,
> +#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
> +	RTE_MBUF_L2_LEN_OFS =
> +		sizeof(uint64_t) * CHAR_BIT - RTE_MBUF_L2_LEN_BITS,
> +	RTE_MBUF_L3_LEN_OFS = RTE_MBUF_L2_LEN_OFS - RTE_MBUF_L3_LEN_BITS,
> +	RTE_MBUF_L4_LEN_OFS = RTE_MBUF_L3_LEN_OFS - RTE_MBUF_L4_LEN_BITS,
> +	RTE_MBUF_TSO_SEGSZ_OFS = RTE_MBUF_L4_LEN_OFS - RTE_MBUF_TSO_SEGSZ_BITS,
> +	RTE_MBUF_OUTL3_LEN_OFS =
> +		RTE_MBUF_TSO_SEGSZ_OFS - RTE_MBUF_OUTL3_LEN_BITS,
> +	RTE_MBUF_OUTL2_LEN_OFS =
> +		RTE_MBUF_OUTL3_LEN_OFS - RTE_MBUF_OUTL2_LEN_BITS,
> +	RTE_MBUF_TXOFLD_UNUSED_OFS =
> +		RTE_MBUF_OUTL2_LEN_OFS - RTE_MBUF_TXOFLD_UNUSED_BITS,
> +#else
> +	RTE_MBUF_L2_LEN_OFS = 0,
> +	RTE_MBUF_L3_LEN_OFS = RTE_MBUF_L2_LEN_OFS + RTE_MBUF_L2_LEN_BITS,
> +	RTE_MBUF_L4_LEN_OFS = RTE_MBUF_L3_LEN_OFS + RTE_MBUF_L3_LEN_BITS,
> +	RTE_MBUF_TSO_SEGSZ_OFS = RTE_MBUF_L4_LEN_OFS + RTE_MBUF_L4_LEN_BITS,
> +	RTE_MBUF_OUTL3_LEN_OFS =
> +		RTE_MBUF_TSO_SEGSZ_OFS + RTE_MBUF_TSO_SEGSZ_BITS,
> +	RTE_MBUF_OUTL2_LEN_OFS =
> +		RTE_MBUF_OUTL3_LEN_OFS + RTE_MBUF_OUTL3_LEN_BITS,
> +	RTE_MBUF_TXOFLD_UNUSED_OFS =
> +		RTE_MBUF_OUTL2_LEN_OFS + RTE_MBUF_OUTL2_LEN_BITS,
> +#endif
> +};
> +
> +/**
> + * The generic rte_mbuf, containing a packet mbuf.
> + */
> +struct rte_mbuf {
> +	MARKER cacheline0;
> +
> +	void *buf_addr;           /**< Virtual address of segment buffer. */
> +	/**
> +	 * Physical address of segment buffer.
> +	 * Force alignment to 8-bytes, so as to ensure we have the exact
> +	 * same mbuf cacheline0 layout for 32-bit and 64-bit. This makes
> +	 * working on vector drivers easier.
> +	 */
> +	RTE_STD_C11
> +	union {
> +		rte_iova_t buf_iova;
> +		rte_iova_t buf_physaddr; /**< deprecated */
> +	} __rte_aligned(sizeof(rte_iova_t));
> +
> +	/* next 8 bytes are initialised on RX descriptor rearm */
> +	MARKER64 rearm_data;
> +	uint16_t data_off;
> +
> +	/**
> +	 * Reference counter. Its size should at least equal to the size
> +	 * of port field (16 bits), to support zero-copy broadcast.
> +	 * It should only be accessed using the following functions:
> +	 * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
> +	 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
> +	 * or non-atomic) is controlled by the CONFIG_RTE_MBUF_REFCNT_ATOMIC
> +	 * config option.
> +	 */
> +	RTE_STD_C11
> +	union {
> +		rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
> +		/** Non-atomically accessed refcnt */
> +		uint16_t refcnt;
> +	};
> +	uint16_t nb_segs;         /**< Number of segments. */
> +
> +	/** Input port (16 bits to support more than 256 virtual ports).
> +	 * The event eth Tx adapter uses this field to specify the output port.
> +	 */
> +	uint16_t port;
> +
> +	uint64_t ol_flags;        /**< Offload features. */
> +
> +	/* remaining bytes are set on RX when pulling packet from descriptor */
> +	MARKER rx_descriptor_fields1;
> +
> +	/*
> +	 * The packet type, which is the combination of outer/inner L2, L3, L4
> +	 * and tunnel types. The packet_type is about data really present in the
> +	 * mbuf. Example: if vlan stripping is enabled, a received vlan packet
> +	 * would have RTE_PTYPE_L2_ETHER and not RTE_PTYPE_L2_VLAN because the
> +	 * vlan is stripped from the data.
> +	 */
> +	RTE_STD_C11
> +	union {
> +		uint32_t packet_type; /**< L2/L3/L4 and tunnel information. */
> +		struct {
> +			uint32_t l2_type:4; /**< (Outer) L2 type. */
> +			uint32_t l3_type:4; /**< (Outer) L3 type. */
> +			uint32_t l4_type:4; /**< (Outer) L4 type. */
> +			uint32_t tun_type:4; /**< Tunnel type. */
> +			RTE_STD_C11
> +			union {
> +				uint8_t inner_esp_next_proto;
> +				/**< ESP next protocol type, valid if
> +				 * RTE_PTYPE_TUNNEL_ESP tunnel type is set
> +				 * on both Tx and Rx.
> +				 */
> +				__extension__
> +				struct {
> +					uint8_t inner_l2_type:4;
> +					/**< Inner L2 type. */
> +					uint8_t inner_l3_type:4;
> +					/**< Inner L3 type. */
> +				};
> +			};
> +			uint32_t inner_l4_type:4; /**< Inner L4 type. */
> +		};
> +	};
> +
> +	uint32_t pkt_len;         /**< Total pkt len: sum of all segments. */
> +	uint16_t data_len;        /**< Amount of data in segment buffer. */
> +	/** VLAN TCI (CPU order), valid if PKT_RX_VLAN is set. */
> +	uint16_t vlan_tci;
> +
> +	RTE_STD_C11
> +	union {
> +		union {
> +			uint32_t rss;     /**< RSS hash result if RSS enabled */
> +			struct {
> +				union {
> +					struct {
> +						uint16_t hash;
> +						uint16_t id;
> +					};
> +					uint32_t lo;
> +					/**< Second 4 flexible bytes */
> +				};
> +				uint32_t hi;
> +				/**< First 4 flexible bytes or FD ID, dependent
> +				 * on PKT_RX_FDIR_* flag in ol_flags.
> +				 */
> +			} fdir;	/**< Filter identifier if FDIR enabled */
> +			struct rte_mbuf_sched sched;
> +			/**< Hierarchical scheduler : 8 bytes */
> +			struct {
> +				uint32_t reserved1;
> +				uint16_t reserved2;
> +				uint16_t txq;
> +				/**< The event eth Tx adapter uses this field
> +				 * to store Tx queue id.
> +				 * @see rte_event_eth_tx_adapter_txq_set()
> +				 */
> +			} txadapter; /**< Eventdev ethdev Tx adapter */
> +			/**< User defined tags. See rte_distributor_process() */
> +			uint32_t usr;
> +		} hash;                   /**< hash information */
> +		struct {
> +			/**
> +			 * Application specific metadata value
> +			 * for egress flow rule match.
> +			 * Valid if PKT_TX_METADATA is set.
> +			 * Located here to allow conjunct use
> +			 * with hash.sched.hi.
> +			 */
> +			uint32_t tx_metadata;
> +			uint32_t reserved;
> +		};
> +	};
> +
> +	/** Outer VLAN TCI (CPU order), valid if PKT_RX_QINQ is set. */
> +	uint16_t vlan_tci_outer;
> +
> +	uint16_t buf_len;         /**< Length of segment buffer. */
> +
> +	/** Valid if PKT_RX_TIMESTAMP is set. The unit and time reference
> +	 * are not normalized but are always the same for a given port.
> +	 * Some devices allow to query rte_eth_read_clock that will return the
> +	 * current device timestamp.
> +	 */
> +	uint64_t timestamp;
> +
> +	/* second cache line - fields only used in slow path or on TX */
> +	MARKER cacheline1 __rte_cache_min_aligned;
> +
> +	RTE_STD_C11
> +	union {
> +		void *userdata;   /**< Can be used for external metadata */
> +		uint64_t udata64; /**< Allow 8-byte userdata on 32-bit */
> +	};
> +
> +	struct rte_mempool *pool; /**< Pool from which mbuf was allocated. */
> +	struct rte_mbuf *next;    /**< Next segment of scattered packet. */
> +
> +	/* fields to support TX offloads */
> +	RTE_STD_C11
> +	union {
> +		uint64_t tx_offload;       /**< combined for easy fetch */
> +		__extension__
> +		struct {
> +			uint64_t l2_len:RTE_MBUF_L2_LEN_BITS;
> +			/**< L2 (MAC) Header Length for non-tunneling pkt.
> +			 * Outer_L4_len + ... + Inner_L2_len for tunneling pkt.
> +			 */
> +			uint64_t l3_len:RTE_MBUF_L3_LEN_BITS;
> +			/**< L3 (IP) Header Length. */
> +			uint64_t l4_len:RTE_MBUF_L4_LEN_BITS;
> +			/**< L4 (TCP/UDP) Header Length. */
> +			uint64_t tso_segsz:RTE_MBUF_TSO_SEGSZ_BITS;
> +			/**< TCP TSO segment size */
> +
> +			/*
> +			 * Fields for Tx offloading of tunnels.
> +			 * These are undefined for packets which don't request
> +			 * any tunnel offloads (outer IP or UDP checksum,
> +			 * tunnel TSO).
> +			 *
> +			 * PMDs should not use these fields unconditionally
> +			 * when calculating offsets.
> +			 *
> +			 * Applications are expected to set appropriate tunnel
> +			 * offload flags when they fill in these fields.
> +			 */
> +			uint64_t outer_l3_len:RTE_MBUF_OUTL3_LEN_BITS;
> +			/**< Outer L3 (IP) Hdr Length. */
> +			uint64_t outer_l2_len:RTE_MBUF_OUTL2_LEN_BITS;
> +			/**< Outer L2 (MAC) Hdr Length. */
> +
> +			/* uint64_t unused:RTE_MBUF_TXOFLD_UNUSED_BITS; */
> +		};
> +	};
> +
> +	/** Size of the application private data. In case of an indirect
> +	 * mbuf, it stores the direct mbuf private data size.
> +	 */
> +	uint16_t priv_size;
> +
> +	/** Timesync flags for use with IEEE1588. */
> +	uint16_t timesync;
> +
> +	/** Sequence number. See also rte_reorder_insert(). */
> +	uint32_t seqn;
> +
> +	/** Shared data for external buffer attached to mbuf. See
> +	 * rte_pktmbuf_attach_extbuf().
> +	 */
> +	struct rte_mbuf_ext_shared_info *shinfo;
> +
> +} __rte_cache_aligned;
> +
> +/**
> + * Function typedef of callback to free externally attached buffer.
> + */
> +typedef void (*rte_mbuf_extbuf_free_callback_t)(void *addr, void *opaque);
> +
> +/**
> + * Shared data at the end of an external buffer.
> + */
> +struct rte_mbuf_ext_shared_info {
> +	rte_mbuf_extbuf_free_callback_t free_cb; /**< Free callback function */
> +	void *fcb_opaque;                        /**< Free callback argument */
> +	rte_atomic16_t refcnt_atomic;        /**< Atomically accessed refcnt */
> +};
> +
> +/**< Maximum number of nb_segs allowed. */
> +#define RTE_MBUF_MAX_NB_SEGS	UINT16_MAX
> +
> +/**
> + * Returns TRUE if given mbuf is cloned by mbuf indirection, or FALSE
> + * otherwise.
> + *
> + * If a mbuf has its data in another mbuf and references it by mbuf
> + * indirection, this mbuf can be defined as a cloned mbuf.
> + */
> +#define RTE_MBUF_CLONED(mb)     ((mb)->ol_flags & IND_ATTACHED_MBUF)
> +
> +/**
> + * Returns TRUE if given mbuf has an external buffer, or FALSE otherwise.
> + *
> + * External buffer is a user-provided anonymous buffer.
> + */
> +#define RTE_MBUF_HAS_EXTBUF(mb) ((mb)->ol_flags & EXT_ATTACHED_MBUF)
> +
> +/**
> + * Returns TRUE if given mbuf is direct, or FALSE otherwise.
> + *
> + * If a mbuf embeds its own data after the rte_mbuf structure, this mbuf
> + * can be defined as a direct mbuf.
> + */
> +#define RTE_MBUF_DIRECT(mb) \
> +	(!((mb)->ol_flags & (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF)))
> +
> +#define MBUF_INVALID_PORT UINT16_MAX
> +
> +/**
> + * A macro that points to an offset into the data in the mbuf.
> + *
> + * The returned pointer is cast to type t. Before using this
> + * function, the user must ensure that the first segment is large
> + * enough to accommodate its data.
> + *
> + * @param m
> + *   The packet mbuf.
> + * @param o
> + *   The offset into the mbuf data.
> + * @param t
> + *   The type to cast the result into.
> + */
> +#define rte_pktmbuf_mtod_offset(m, t, o)	\
> +	((t)((char *)(m)->buf_addr + (m)->data_off + (o)))
> +
> +/**
> + * A macro that points to the start of the data in the mbuf.
> + *
> + * The returned pointer is cast to type t. Before using this
> + * function, the user must ensure that the first segment is large
> + * enough to accommodate its data.
> + *
> + * @param m
> + *   The packet mbuf.
> + * @param t
> + *   The type to cast the result into.
> + */
> +#define rte_pktmbuf_mtod(m, t) rte_pktmbuf_mtod_offset(m, t, 0)
> +
> +/**
> + * A macro that returns the IO address that points to an offset of the
> + * start of the data in the mbuf
> + *
> + * @param m
> + *   The packet mbuf.
> + * @param o
> + *   The offset into the data to calculate address from.
> + */
> +#define rte_pktmbuf_iova_offset(m, o) \
> +	(rte_iova_t)((m)->buf_iova + (m)->data_off + (o))
> +
> +/**
> + * A macro that returns the IO address that points to the start of the
> + * data in the mbuf
> + *
> + * @param m
> + *   The packet mbuf.
> + */
> +#define rte_pktmbuf_iova(m) rte_pktmbuf_iova_offset(m, 0)
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif /* _RTE_MBUF_CORE_H_ */
>