DPDK: Data Plane Development Kit

18.05.0-rc5
rte_mbuf.h File Reference
#include <stdint.h>
#include <rte_compat.h>
#include <rte_common.h>
#include <rte_config.h>
#include <rte_mempool.h>
#include <rte_memory.h>
#include <rte_atomic.h>
#include <rte_prefetch.h>
#include <rte_branch_prediction.h>
#include <rte_mbuf_ptype.h>

Go to the source code of this file.

Data Structures

struct  rte_mbuf
struct  rte_mbuf_ext_shared_info
struct  rte_pktmbuf_pool_private

Macros

#define PKT_RX_VLAN   (1ULL << 0)
#define PKT_RX_RSS_HASH   (1ULL << 1)
#define PKT_RX_FDIR   (1ULL << 2)
#define PKT_RX_L4_CKSUM_BAD   (1ULL << 3)
#define PKT_RX_IP_CKSUM_BAD   (1ULL << 4)
#define PKT_RX_EIP_CKSUM_BAD   (1ULL << 5)
#define PKT_RX_VLAN_STRIPPED   (1ULL << 6)
#define PKT_RX_IP_CKSUM_MASK   ((1ULL << 4) | (1ULL << 7))
#define PKT_RX_IP_CKSUM_BAD   (1ULL << 4)
#define PKT_RX_L4_CKSUM_MASK   ((1ULL << 3) | (1ULL << 8))
#define PKT_RX_L4_CKSUM_BAD   (1ULL << 3)
#define PKT_RX_IEEE1588_PTP   (1ULL << 9)
#define PKT_RX_IEEE1588_TMST   (1ULL << 10)
#define PKT_RX_FDIR_ID   (1ULL << 13)
#define PKT_RX_FDIR_FLX   (1ULL << 14)
#define PKT_RX_QINQ_STRIPPED   (1ULL << 15)
#define PKT_RX_LRO   (1ULL << 16)
#define PKT_RX_TIMESTAMP   (1ULL << 17)
#define PKT_RX_SEC_OFFLOAD   (1ULL << 18)
#define PKT_RX_SEC_OFFLOAD_FAILED   (1ULL << 19)
#define PKT_RX_QINQ   (1ULL << 20)
#define PKT_TX_UDP_SEG   (1ULL << 42)
#define PKT_TX_SEC_OFFLOAD   (1ULL << 43)
#define PKT_TX_MACSEC   (1ULL << 44)
#define PKT_TX_TUNNEL_VXLAN   (0x1ULL << 45)
#define PKT_TX_TUNNEL_MPLSINUDP   (0x5ULL << 45)
#define PKT_TX_TUNNEL_IP   (0xDULL << 45)
#define PKT_TX_TUNNEL_UDP   (0xEULL << 45)
#define PKT_TX_QINQ   (1ULL << 49)
#define PKT_TX_TCP_SEG   (1ULL << 50)
#define PKT_TX_IEEE1588_TMST   (1ULL << 51)
#define PKT_TX_L4_NO_CKSUM   (0ULL << 52)
#define PKT_TX_TCP_CKSUM   (1ULL << 52)
#define PKT_TX_SCTP_CKSUM   (2ULL << 52)
#define PKT_TX_UDP_CKSUM   (3ULL << 52)
#define PKT_TX_L4_MASK   (3ULL << 52)
#define PKT_TX_IP_CKSUM   (1ULL << 54)
#define PKT_TX_IPV4   (1ULL << 55)
#define PKT_TX_IPV6   (1ULL << 56)
#define PKT_TX_VLAN   (1ULL << 57)
#define PKT_TX_OUTER_IP_CKSUM   (1ULL << 58)
#define PKT_TX_OUTER_IPV4   (1ULL << 59)
#define PKT_TX_OUTER_IPV6   (1ULL << 60)
#define PKT_TX_OFFLOAD_MASK
#define EXT_ATTACHED_MBUF   (1ULL << 61)
#define IND_ATTACHED_MBUF   (1ULL << 62)
#define RTE_MBUF_PRIV_ALIGN   8
#define RTE_MBUF_DEFAULT_DATAROOM   2048
#define RTE_MBUF_CLONED(mb)   ((mb)->ol_flags & IND_ATTACHED_MBUF)
#define RTE_MBUF_INDIRECT(mb)   RTE_MBUF_CLONED(mb)
#define RTE_MBUF_HAS_EXTBUF(mb)   ((mb)->ol_flags & EXT_ATTACHED_MBUF)
#define RTE_MBUF_DIRECT(mb)   (!((mb)->ol_flags & (IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF)))
#define __rte_mbuf_sanity_check(m, is_h)   do { } while (0)
#define RTE_MBUF_PREFETCH_TO_FREE(m)
#define MBUF_INVALID_PORT   UINT16_MAX
#define rte_pktmbuf_detach_extbuf(m)   rte_pktmbuf_detach(m)
#define rte_pktmbuf_mtod_offset(m, t, o)   ((t)((char *)(m)->buf_addr + (m)->data_off + (o)))
#define rte_pktmbuf_mtod(m, t)   rte_pktmbuf_mtod_offset(m, t, 0)
#define rte_pktmbuf_iova_offset(m, o)   (rte_iova_t)((m)->buf_iova + (m)->data_off + (o))
#define rte_pktmbuf_iova(m)   rte_pktmbuf_iova_offset(m, 0)
#define rte_pktmbuf_pkt_len(m)   ((m)->pkt_len)
#define rte_pktmbuf_data_len(m)   ((m)->data_len)

Typedefs

typedef void(* rte_mbuf_extbuf_free_callback_t )(void *addr, void *opaque)

Functions

const char * rte_get_rx_ol_flag_name (uint64_t mask)
int rte_get_rx_ol_flag_list (uint64_t mask, char *buf, size_t buflen)
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)
static void rte_mbuf_prefetch_part1 (struct rte_mbuf *m)
static void rte_mbuf_prefetch_part2 (struct rte_mbuf *m)
static uint16_t rte_pktmbuf_priv_size (struct rte_mempool *mp)
static rte_iova_t rte_mbuf_data_iova (const struct rte_mbuf *mb)
static rte_iova_t rte_mbuf_data_iova_default (const struct rte_mbuf *mb)
static struct rte_mbufrte_mbuf_from_indirect (struct rte_mbuf *mi)
static char * rte_mbuf_to_baddr (struct rte_mbuf *md)
static uint16_t rte_mbuf_refcnt_update (struct rte_mbuf *m, int16_t value)
static uint16_t rte_mbuf_refcnt_read (const struct rte_mbuf *m)
static void rte_mbuf_refcnt_set (struct rte_mbuf *m, uint16_t new_value)
static uint16_t rte_mbuf_ext_refcnt_read (const struct rte_mbuf_ext_shared_info *shinfo)
static void rte_mbuf_ext_refcnt_set (struct rte_mbuf_ext_shared_info *shinfo, uint16_t new_value)
static uint16_t rte_mbuf_ext_refcnt_update (struct rte_mbuf_ext_shared_info *shinfo, int16_t value)
void rte_mbuf_sanity_check (const struct rte_mbuf *m, int is_header)
static struct rte_mbufrte_mbuf_raw_alloc (struct rte_mempool *mp)
static __rte_always_inline void rte_mbuf_raw_free (struct rte_mbuf *m)
void rte_pktmbuf_init (struct rte_mempool *mp, void *opaque_arg, void *m, unsigned i)
void rte_pktmbuf_pool_init (struct rte_mempool *mp, void *opaque_arg)
struct rte_mempoolrte_pktmbuf_pool_create (const char *name, unsigned n, unsigned cache_size, uint16_t priv_size, uint16_t data_room_size, int socket_id)
struct rte_mempool
*__rte_experimental 
rte_pktmbuf_pool_create_by_ops (const char *name, unsigned int n, unsigned int cache_size, uint16_t priv_size, uint16_t data_room_size, int socket_id, const char *ops_name)
static uint16_t rte_pktmbuf_data_room_size (struct rte_mempool *mp)
static void rte_pktmbuf_reset_headroom (struct rte_mbuf *m)
static struct rte_mbufrte_pktmbuf_alloc (struct rte_mempool *mp)
static int rte_pktmbuf_alloc_bulk (struct rte_mempool *pool, struct rte_mbuf **mbufs, unsigned count)
static struct
rte_mbuf_ext_shared_info
rte_pktmbuf_ext_shinfo_init_helper (void *buf_addr, uint16_t *buf_len, rte_mbuf_extbuf_free_callback_t free_cb, void *fcb_opaque)
static void __rte_experimental rte_pktmbuf_attach_extbuf (struct rte_mbuf *m, void *buf_addr, rte_iova_t buf_iova, uint16_t buf_len, struct rte_mbuf_ext_shared_info *shinfo)
static void rte_pktmbuf_attach (struct rte_mbuf *mi, struct rte_mbuf *m)
static void rte_pktmbuf_detach (struct rte_mbuf *m)
static __rte_always_inline
struct rte_mbuf
rte_pktmbuf_prefree_seg (struct rte_mbuf *m)
static __rte_always_inline void rte_pktmbuf_free_seg (struct rte_mbuf *m)
static void rte_pktmbuf_free (struct rte_mbuf *m)
static struct rte_mbufrte_pktmbuf_clone (struct rte_mbuf *md, struct rte_mempool *mp)
static void rte_pktmbuf_refcnt_update (struct rte_mbuf *m, int16_t v)
static uint16_t rte_pktmbuf_headroom (const struct rte_mbuf *m)
static uint16_t rte_pktmbuf_tailroom (const struct rte_mbuf *m)
static struct rte_mbufrte_pktmbuf_lastseg (struct rte_mbuf *m)
static char * rte_pktmbuf_prepend (struct rte_mbuf *m, uint16_t len)
static char * rte_pktmbuf_append (struct rte_mbuf *m, uint16_t len)
static char * rte_pktmbuf_adj (struct rte_mbuf *m, uint16_t len)
static int rte_pktmbuf_trim (struct rte_mbuf *m, uint16_t len)
static int rte_pktmbuf_is_contiguous (const struct rte_mbuf *m)
static const void * rte_pktmbuf_read (const struct rte_mbuf *m, uint32_t off, uint32_t len, void *buf)
static int rte_pktmbuf_chain (struct rte_mbuf *head, struct rte_mbuf *tail)
static int rte_validate_tx_offload (const struct rte_mbuf *m)
static int rte_pktmbuf_linearize (struct rte_mbuf *mbuf)
void rte_pktmbuf_dump (FILE *f, const struct rte_mbuf *m, unsigned dump_len)

Variables

__extension__ typedef void * MARKER [0]
__extension__ typedef uint8_t MARKER8 [0]
__extension__ typedef uint64_t MARKER64 [0]
rte_iova_t buf_physaddr

Detailed Description

RTE Mbuf

The mbuf library provides the ability to create and destroy buffers that may be used by the RTE application to store message buffers. The message buffers are stored in a mempool, using the RTE mempool library.

The preferred way to create a mbuf pool is to use rte_pktmbuf_pool_create(). However, in some situations, an application may want to have more control (ex: populate the pool with specific memory), in this case it is possible to use functions from rte_mempool. See how rte_pktmbuf_pool_create() is implemented for details.

This library provides an API to allocate/free packet mbufs, which are used to carry network packets.

To understand the concepts of packet buffers or mbufs, you should read "TCP/IP Illustrated, Volume 2: The Implementation, Addison-Wesley, 1995, ISBN 0-201-63354-X from Richard Stevens" http://www.kohala.com/start/tcpipiv2.html

Definition in file rte_mbuf.h.

Macro Definition Documentation

#define PKT_RX_VLAN   (1ULL << 0)

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.

Definition at line 71 of file rte_mbuf.h.

#define PKT_RX_RSS_HASH   (1ULL << 1)

RX packet with RSS hash result.

Definition at line 73 of file rte_mbuf.h.

#define PKT_RX_FDIR   (1ULL << 2)

RX packet with FDIR match indicate.

Definition at line 74 of file rte_mbuf.h.

#define PKT_RX_L4_CKSUM_BAD   (1ULL << 3)

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.

Examples:
examples/tep_termination/vxlan_setup.c.

Definition at line 130 of file rte_mbuf.h.

#define PKT_RX_IP_CKSUM_BAD   (1ULL << 4)

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.

Examples:
examples/tep_termination/vxlan_setup.c.

Definition at line 115 of file rte_mbuf.h.

#define PKT_RX_EIP_CKSUM_BAD   (1ULL << 5)

External IP header checksum error.

Definition at line 94 of file rte_mbuf.h.

#define PKT_RX_VLAN_STRIPPED   (1ULL << 6)

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.

Definition at line 102 of file rte_mbuf.h.

#define PKT_RX_IP_CKSUM_MASK   ((1ULL << 4) | (1ULL << 7))

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.

Definition at line 112 of file rte_mbuf.h.

#define PKT_RX_IP_CKSUM_BAD   (1ULL << 4)

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.

Definition at line 115 of file rte_mbuf.h.

#define PKT_RX_L4_CKSUM_MASK   ((1ULL << 3) | (1ULL << 8))

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.

Definition at line 127 of file rte_mbuf.h.

#define PKT_RX_L4_CKSUM_BAD   (1ULL << 3)

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.

Definition at line 130 of file rte_mbuf.h.

#define PKT_RX_IEEE1588_PTP   (1ULL << 9)

RX IEEE1588 L2 Ethernet PT Packet.

Examples:
examples/ptpclient/ptpclient.c.

Definition at line 134 of file rte_mbuf.h.

#define PKT_RX_IEEE1588_TMST   (1ULL << 10)

RX IEEE1588 L2/L4 timestamped packet.

Definition at line 135 of file rte_mbuf.h.

#define PKT_RX_FDIR_ID   (1ULL << 13)

FD id reported if FDIR match.

Definition at line 136 of file rte_mbuf.h.

#define PKT_RX_FDIR_FLX   (1ULL << 14)

Flexible bytes reported if FDIR match.

Definition at line 137 of file rte_mbuf.h.

#define PKT_RX_QINQ_STRIPPED   (1ULL << 15)

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. If this flag is set, When PKT_RX_QINQ_STRIPPED is set, the flags (PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED | PKT_RX_QINQ) must also be set.

Definition at line 147 of file rte_mbuf.h.

#define PKT_RX_LRO   (1ULL << 16)

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.

Definition at line 154 of file rte_mbuf.h.

#define PKT_RX_TIMESTAMP   (1ULL << 17)

Indicate that the timestamp field in the mbuf is valid.

Definition at line 159 of file rte_mbuf.h.

#define PKT_RX_SEC_OFFLOAD   (1ULL << 18)

Indicate that security offload processing was applied on the RX packet.

Examples:
examples/ipsec-secgw/esp.c, and examples/ipsec-secgw/ipsec-secgw.c.

Definition at line 164 of file rte_mbuf.h.

#define PKT_RX_SEC_OFFLOAD_FAILED   (1ULL << 19)

Indicate that security offload processing failed on the RX packet.

Examples:
examples/ipsec-secgw/esp.c.

Definition at line 169 of file rte_mbuf.h.

#define PKT_RX_QINQ   (1ULL << 20)

The RX packet is a double VLAN, and the outer tci has been saved in in mbuf->vlan_tci_outer. If the flag PKT_RX_QINQ_STRIPPED is also present, both VLANs headers have been stripped from mbuf data, else they are still present.

Definition at line 178 of file rte_mbuf.h.

#define PKT_TX_UDP_SEG   (1ULL << 42)

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.

Definition at line 189 of file rte_mbuf.h.

#define PKT_TX_SEC_OFFLOAD   (1ULL << 43)

Request security offload processing on the TX packet.

Examples:
examples/ipsec-secgw/esp.c, and examples/ipsec-secgw/ipsec-secgw.c.

Definition at line 194 of file rte_mbuf.h.

#define PKT_TX_MACSEC   (1ULL << 44)

Offload the MACsec. This flag must be set by the application to enable this offload feature for a packet to be transmitted.

Definition at line 200 of file rte_mbuf.h.

#define PKT_TX_TUNNEL_VXLAN   (0x1ULL << 45)

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.

Examples:
examples/tep_termination/vxlan.c.

Definition at line 210 of file rte_mbuf.h.

#define PKT_TX_TUNNEL_MPLSINUDP   (0x5ULL << 45)

TX packet with MPLS-in-UDP RFC 7510 header.

Definition at line 215 of file rte_mbuf.h.

#define PKT_TX_TUNNEL_IP   (0xDULL << 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.

Definition at line 228 of file rte_mbuf.h.

#define PKT_TX_TUNNEL_UDP   (0xEULL << 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.

Definition at line 241 of file rte_mbuf.h.

#define PKT_TX_QINQ   (1ULL << 49)

Second VLAN insertion (QinQ) flag.TX packet with double VLAN inserted.

Definition at line 248 of file rte_mbuf.h.

#define PKT_TX_TCP_SEG   (1ULL << 50)

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
Examples:
examples/tep_termination/vxlan.c, and examples/vhost/main.c.

Definition at line 261 of file rte_mbuf.h.

#define PKT_TX_IEEE1588_TMST   (1ULL << 51)

TX IEEE1588 packet to timestamp.

Examples:
examples/ptpclient/ptpclient.c.

Definition at line 263 of file rte_mbuf.h.

#define PKT_TX_L4_NO_CKSUM   (0ULL << 52)

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_IPV6Disable L4 cksum of TX pkt.

Definition at line 273 of file rte_mbuf.h.

#define PKT_TX_TCP_CKSUM   (1ULL << 52)

TCP cksum of TX pkt. computed by NIC.

Examples:
examples/tep_termination/vxlan.c.

Definition at line 274 of file rte_mbuf.h.

#define PKT_TX_SCTP_CKSUM   (2ULL << 52)

SCTP cksum of TX pkt. computed by NIC.

Examples:
examples/tep_termination/vxlan.c.

Definition at line 275 of file rte_mbuf.h.

#define PKT_TX_UDP_CKSUM   (3ULL << 52)

UDP cksum of TX pkt. computed by NIC.

Examples:
examples/tep_termination/vxlan.c.

Definition at line 276 of file rte_mbuf.h.

#define PKT_TX_L4_MASK   (3ULL << 52)

Mask for L4 cksum offload request.

Definition at line 277 of file rte_mbuf.h.

#define PKT_TX_IP_CKSUM   (1ULL << 54)

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
Examples:
examples/ipsec-secgw/ipsec-secgw.c, examples/tep_termination/vxlan.c, and examples/vhost/main.c.

Definition at line 285 of file rte_mbuf.h.

#define PKT_TX_IPV4   (1ULL << 55)

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.

Examples:
examples/ipsec-secgw/ipsec-secgw.c, examples/tep_termination/vxlan.c, and examples/vhost/main.c.

Definition at line 293 of file rte_mbuf.h.

#define PKT_TX_IPV6   (1ULL << 56)

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.

Examples:
examples/ipsec-secgw/ipsec-secgw.c, and examples/tep_termination/vxlan.c.

Definition at line 301 of file rte_mbuf.h.

#define PKT_TX_VLAN   (1ULL << 57)

TX packet is a 802.1q VLAN packet.

Definition at line 306 of file rte_mbuf.h.

#define PKT_TX_OUTER_IP_CKSUM   (1ULL << 58)

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
Examples:
examples/tep_termination/vxlan.c.

Definition at line 316 of file rte_mbuf.h.

#define PKT_TX_OUTER_IPV4   (1ULL << 59)

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.

Definition at line 323 of file rte_mbuf.h.

#define PKT_TX_OUTER_IPV6   (1ULL << 60)

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.

Definition at line 330 of file rte_mbuf.h.

#define PKT_TX_OFFLOAD_MASK
Value:
( \
PKT_TX_IP_CKSUM | \
PKT_TX_L4_MASK | \
PKT_TX_OUTER_IP_CKSUM | \
PKT_TX_TCP_SEG | \
PKT_TX_IEEE1588_TMST | \
PKT_TX_QINQ_PKT | \
PKT_TX_VLAN_PKT | \
PKT_TX_TUNNEL_MASK | \
PKT_TX_MACSEC | \
PKT_TX_SEC_OFFLOAD)

Bitmask of all supported packet Tx offload features flags, which can be set for packet.

Definition at line 336 of file rte_mbuf.h.

#define EXT_ATTACHED_MBUF   (1ULL << 61)

Mbuf having an external buffer attached. shinfo in mbuf must be filled.

Definition at line 351 of file rte_mbuf.h.

#define IND_ATTACHED_MBUF   (1ULL << 62)

Indirect attached mbuf

Definition at line 353 of file rte_mbuf.h.

#define RTE_MBUF_PRIV_ALIGN   8

Alignment constraint of mbuf private area.

Definition at line 356 of file rte_mbuf.h.

#define RTE_MBUF_DEFAULT_DATAROOM   2048

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.

Definition at line 414 of file rte_mbuf.h.

#define RTE_MBUF_CLONED (   mb)    ((mb)->ol_flags & IND_ATTACHED_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.

Definition at line 738 of file rte_mbuf.h.

#define RTE_MBUF_INDIRECT (   mb)    RTE_MBUF_CLONED(mb)

Returns TRUE if given mbuf is indirect, or FALSE otherwise.

Definition at line 743 of file rte_mbuf.h.

#define RTE_MBUF_HAS_EXTBUF (   mb)    ((mb)->ol_flags & EXT_ATTACHED_MBUF)

Returns TRUE if given mbuf has an external buffer, or FALSE otherwise.

External buffer is a user-provided anonymous buffer.

Definition at line 750 of file rte_mbuf.h.

#define RTE_MBUF_DIRECT (   mb)    (!((mb)->ol_flags & (IND_ATTACHED_MBUF | 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.

Definition at line 758 of file rte_mbuf.h.

#define __rte_mbuf_sanity_check (   m,
  is_h 
)    do { } while (0)

check mbuf type in debug mode

Examples:
examples/ipv4_multicast/main.c.

Definition at line 780 of file rte_mbuf.h.

#define RTE_MBUF_PREFETCH_TO_FREE (   m)
Value:
do { \
if ((m) != NULL) \
rte_prefetch0(m); \
} while (0)

Mbuf prefetch

Definition at line 940 of file rte_mbuf.h.

#define MBUF_INVALID_PORT   UINT16_MAX

Reset the fields of a packet mbuf to their default values.

The given mbuf must have only one segment.

Parameters
mThe packet mbuf to be resetted.

Definition at line 1216 of file rte_mbuf.h.

#define rte_pktmbuf_detach_extbuf (   m)    rte_pktmbuf_detach(m)

Detach the external buffer attached to a mbuf, same as rte_pktmbuf_detach()

Parameters
mThe mbuf having external buffer.

Definition at line 1457 of file rte_mbuf.h.

#define rte_pktmbuf_mtod_offset (   m,
  t,
 
)    ((t)((char *)(m)->buf_addr + (m)->data_off + (o)))

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.

Parameters
mThe packet mbuf.
oThe offset into the mbuf data.
tThe type to cast the result into.
Examples:
examples/bbdev_app/main.c, examples/ipsec-secgw/esp.c, examples/ipsec-secgw/ipsec-secgw.c, examples/l3fwd-acl/main.c, examples/l3fwd-power/main.c, examples/l3fwd-vf/main.c, examples/load_balancer/runtime.c, examples/performance-thread/l3fwd-thread/main.c, examples/server_node_efd/node/node.c, examples/server_node_efd/server/main.c, and examples/vhost/virtio_net.c.

Definition at line 1823 of file rte_mbuf.h.

#define rte_pktmbuf_iova_offset (   m,
 
)    (rte_iova_t)((m)->buf_iova + (m)->data_off + (o))

A macro that returns the IO address that points to an offset of the start of the data in the mbuf

Parameters
mThe packet mbuf.
oThe offset into the data to calculate address from.
Examples:
examples/ipsec-secgw/esp.c, and examples/l2fwd-crypto/main.c.

Definition at line 1849 of file rte_mbuf.h.

#define rte_pktmbuf_iova (   m)    rte_pktmbuf_iova_offset(m, 0)

A macro that returns the IO address that points to the start of the data in the mbuf

Parameters
mThe packet mbuf.

Definition at line 1863 of file rte_mbuf.h.

#define rte_pktmbuf_pkt_len (   m)    ((m)->pkt_len)

A macro that returns the length of the packet.

The value can be read or assigned.

Parameters
mThe packet mbuf.
Examples:
examples/ipsec-secgw/esp.c, examples/l2fwd-crypto/main.c, and examples/qos_meter/main.c.

Definition at line 1876 of file rte_mbuf.h.

#define rte_pktmbuf_data_len (   m)    ((m)->data_len)

A macro that returns the length of the segment.

The value can be read or assigned.

Parameters
mThe packet mbuf.
Examples:
examples/bbdev_app/main.c, examples/exception_path/main.c, examples/ipsec-secgw/esp.c, examples/l2fwd-crypto/main.c, examples/netmap_compat/lib/compat_netmap.c, and examples/vhost/virtio_net.c.

Definition at line 1886 of file rte_mbuf.h.

Typedef Documentation

typedef void(* rte_mbuf_extbuf_free_callback_t)(void *addr, void *opaque)

Function typedef of callback to free externally attached buffer.

Definition at line 601 of file rte_mbuf.h.

Function Documentation

const char* rte_get_rx_ol_flag_name ( uint64_t  mask)

Get the name of a RX offload flag

Parameters
maskThe mask describing the flag.
Returns
The name of this flag, or NULL if it's not a valid RX flag.
int rte_get_rx_ol_flag_list ( uint64_t  mask,
char *  buf,
size_t  buflen 
)

Dump the list of RX offload flags in a buffer

Parameters
maskThe mask describing the RX flags.
bufThe output buffer.
buflenThe length of the buffer.
Returns
0 on success, (-1) on error.
const char* rte_get_tx_ol_flag_name ( uint64_t  mask)

Get the name of a TX offload flag

Parameters
maskThe mask describing the flag. Usually only one bit must be set. Several bits can be given if they belong to the same mask. Ex: PKT_TX_L4_MASK.
Returns
The name of this flag, or NULL if it's not a valid TX flag.
int rte_get_tx_ol_flag_list ( uint64_t  mask,
char *  buf,
size_t  buflen 
)

Dump the list of TX offload flags in a buffer

Parameters
maskThe mask describing the TX flags.
bufThe output buffer.
buflenThe length of the buffer.
Returns
0 on success, (-1) on error.
static void rte_mbuf_prefetch_part1 ( struct rte_mbuf m)
inlinestatic

Prefetch the first part of the mbuf

The first 64 bytes of the mbuf corresponds to fields that are used early in the receive path. If the cache line of the architecture is higher than 64B, the second part will also be prefetched.

Parameters
mThe pointer to the mbuf.

Definition at line 626 of file rte_mbuf.h.

static void rte_mbuf_prefetch_part2 ( struct rte_mbuf m)
inlinestatic

Prefetch the second part of the mbuf

The next 64 bytes of the mbuf corresponds to fields that are used in the transmit path. If the cache line of the architecture is higher than 64B, this function does nothing as it is expected that the full mbuf is already in cache.

Parameters
mThe pointer to the mbuf.
Examples:
examples/ipsec-secgw/ipsec-secgw.c.

Definition at line 643 of file rte_mbuf.h.

static uint16_t rte_pktmbuf_priv_size ( struct rte_mempool mp)
inlinestatic

Get the application private size of mbufs stored in a pktmbuf_pool

The private size of mbuf is a zone located between the rte_mbuf structure and the data buffer where an application can store data associated to a packet.

Parameters
mpThe packet mbuf pool.
Returns
The private size of mbufs stored in this mempool.

Definition at line 1186 of file rte_mbuf.h.

static rte_iova_t rte_mbuf_data_iova ( const struct rte_mbuf mb)
inlinestatic

Return the IO address of the beginning of the mbuf data

Parameters
mbThe pointer to the mbuf.
Returns
The IO address of the beginning of the mbuf data

Definition at line 664 of file rte_mbuf.h.

static rte_iova_t rte_mbuf_data_iova_default ( const struct rte_mbuf mb)
inlinestatic

Return the default IO address of the beginning of the mbuf data

This function is used by drivers in their receive function, as it returns the location where data should be written by the NIC, taking the default headroom in account.

Parameters
mbThe pointer to the mbuf.
Returns
The IO address of the beginning of the mbuf data

Definition at line 689 of file rte_mbuf.h.

static struct rte_mbuf* rte_mbuf_from_indirect ( struct rte_mbuf mi)
staticread

Return the mbuf owning the data buffer address of an indirect mbuf.

Parameters
miThe pointer to the indirect mbuf.
Returns
The address of the direct mbuf corresponding to buffer_addr.

Definition at line 710 of file rte_mbuf.h.

static char* rte_mbuf_to_baddr ( struct rte_mbuf md)
inlinestatic

Return the buffer address embedded in the given mbuf.

Parameters
mdThe pointer to the mbuf.
Returns
The address of the data buffer owned by the mbuf.

Definition at line 724 of file rte_mbuf.h.

static uint16_t rte_mbuf_refcnt_update ( struct rte_mbuf m,
int16_t  value 
)
inlinestatic

Adds given value to an mbuf's refcnt and returns its new value.

Definition at line 861 of file rte_mbuf.h.

static uint16_t rte_mbuf_refcnt_read ( const struct rte_mbuf m)
inlinestatic

Reads the value of an mbuf's refcnt.

Definition at line 870 of file rte_mbuf.h.

static void rte_mbuf_refcnt_set ( struct rte_mbuf m,
uint16_t  new_value 
)
inlinestatic

Sets an mbuf's refcnt to the defined value.

Definition at line 879 of file rte_mbuf.h.

static uint16_t rte_mbuf_ext_refcnt_read ( const struct rte_mbuf_ext_shared_info shinfo)
inlinestatic

Reads the refcnt of an external buffer.

Parameters
shinfoShared data of the external buffer.
Returns
Reference count number.

Definition at line 895 of file rte_mbuf.h.

static void rte_mbuf_ext_refcnt_set ( struct rte_mbuf_ext_shared_info shinfo,
uint16_t  new_value 
)
inlinestatic

Set refcnt of an external buffer.

Parameters
shinfoShared data of the external buffer.
new_valueValue set

Definition at line 909 of file rte_mbuf.h.

static uint16_t rte_mbuf_ext_refcnt_update ( struct rte_mbuf_ext_shared_info shinfo,
int16_t  value 
)
inlinestatic

Add given value to refcnt of an external buffer and return its new value.

Parameters
shinfoShared data of the external buffer.
valueValue to add/subtract
Returns
Updated value

Definition at line 927 of file rte_mbuf.h.

void rte_mbuf_sanity_check ( const struct rte_mbuf m,
int  is_header 
)

Sanity checks on an mbuf.

Check the consistency of the given mbuf. The function will cause a panic if corruption is detected.

Parameters
mThe mbuf to be checked.
is_headerTrue if the mbuf is a packet header, false if it is a sub-segment of a packet (in this case, some fields like nb_segs are not checked)
static struct rte_mbuf* rte_mbuf_raw_alloc ( struct rte_mempool mp)
staticread

Allocate an uninitialized mbuf from mempool mp.

This function can be used by PMDs (especially in RX functions) to allocate an uninitialized mbuf. The driver is responsible of initializing all the required fields. See rte_pktmbuf_reset(). For standard needs, prefer rte_pktmbuf_alloc().

The caller can expect that the following fields of the mbuf structure are initialized: buf_addr, buf_iova, buf_len, refcnt=1, nb_segs=1, next=NULL, pool, priv_size. The other fields must be initialized by the caller.

Parameters
mpThe mempool from which mbuf is allocated.
Returns
  • The pointer to the new mbuf on success.
  • NULL if allocation failed.

Definition at line 987 of file rte_mbuf.h.

static __rte_always_inline void rte_mbuf_raw_free ( struct rte_mbuf m)
static

Put mbuf back into its original mempool.

The caller must ensure that the mbuf is direct and properly reinitialized (refcnt=1, next=NULL, nb_segs=1), as done by rte_pktmbuf_prefree_seg().

This function should be used with care, when optimization is required. For standard needs, prefer rte_pktmbuf_free() or rte_pktmbuf_free_seg().

Parameters
mThe mbuf to be freed.

Definition at line 1012 of file rte_mbuf.h.

void rte_pktmbuf_init ( struct rte_mempool mp,
void *  opaque_arg,
void *  m,
unsigned  i 
)

The packet mbuf constructor.

This function initializes some fields in the mbuf structure that are not modified by the user once created (origin pool, buffer start address, and so on). This function is given as a callback function to rte_mempool_obj_iter() or rte_mempool_create() at pool creation time.

Parameters
mpThe mempool from which mbufs originate.
opaque_argA pointer that can be used by the user to retrieve useful information for mbuf initialization. This pointer is the opaque argument passed to rte_mempool_obj_iter() or rte_mempool_create().
mThe mbuf to initialize.
iThe index of the mbuf in the pool table.
void rte_pktmbuf_pool_init ( struct rte_mempool mp,
void *  opaque_arg 
)

A packet mbuf pool constructor.

This function initializes the mempool private data in the case of a pktmbuf pool. This private data is needed by the driver. The function must be called on the mempool before it is used, or it can be given as a callback function to rte_mempool_create() at pool creation. It can be extended by the user, for example, to provide another packet size.

Parameters
mpThe mempool from which mbufs originate.
opaque_argA pointer that can be used by the user to retrieve useful information for mbuf initialization. This pointer is the opaque argument passed to rte_mempool_create().
struct rte_mempool* rte_pktmbuf_pool_create ( const char *  name,
unsigned  n,
unsigned  cache_size,
uint16_t  priv_size,
uint16_t  data_room_size,
int  socket_id 
)
read

Create a mbuf pool.

This function creates and initializes a packet mbuf pool. It is a wrapper to rte_mempool functions.

Parameters
nameThe name of the mbuf pool.
nThe number of elements in the mbuf pool. The optimum size (in terms of memory usage) for a mempool is when n is a power of two minus one: n = (2^q - 1).
cache_sizeSize of the per-core object cache. See rte_mempool_create() for details.
priv_sizeSize of application private are between the rte_mbuf structure and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
data_room_sizeSize of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
socket_idThe socket identifier where the memory should be allocated. The value can be SOCKET_ID_ANY if there is no NUMA constraint for the reserved zone.
Returns
The pointer to the new allocated mempool, on success. NULL on error with rte_errno set appropriately. Possible rte_errno values include:
  • E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
  • E_RTE_SECONDARY - function was called from a secondary process instance
  • EINVAL - cache size provided is too large, or priv_size is not aligned.
  • ENOSPC - the maximum number of memzones has already been allocated
  • EEXIST - a memzone with the same name already exists
  • ENOMEM - no appropriate memory area found in which to create memzone
Examples:
examples/bbdev_app/main.c, examples/bond/main.c, examples/distributor/main.c, examples/ethtool/ethtool-app/main.c, examples/eventdev_pipeline/main.c, examples/exception_path/main.c, examples/flow_classify/flow_classify.c, examples/flow_filtering/main.c, examples/ip_fragmentation/main.c, examples/ip_pipeline/mempool.c, examples/ip_reassembly/main.c, examples/ipsec-secgw/ipsec-secgw.c, examples/ipv4_multicast/main.c, examples/kni/main.c, examples/l2fwd-cat/l2fwd-cat.c, examples/l2fwd-crypto/main.c, examples/l2fwd-jobstats/main.c, examples/l2fwd-keepalive/main.c, examples/l2fwd/main.c, examples/l3fwd-acl/main.c, examples/l3fwd-power/main.c, examples/l3fwd-vf/main.c, examples/l3fwd/main.c, examples/link_status_interrupt/main.c, examples/load_balancer/init.c, examples/multi_process/client_server_mp/mp_server/init.c, examples/multi_process/l2fwd_fork/main.c, examples/multi_process/symmetric_mp/main.c, examples/netmap_compat/bridge/bridge.c, examples/packet_ordering/main.c, examples/performance-thread/l3fwd-thread/main.c, examples/ptpclient/ptpclient.c, examples/qos_meter/main.c, examples/qos_sched/init.c, examples/quota_watermark/qw/main.c, examples/rxtx_callbacks/main.c, examples/server_node_efd/server/init.c, examples/skeleton/basicfwd.c, examples/tep_termination/main.c, examples/vhost/main.c, examples/vm_power_manager/main.c, examples/vmdq/main.c, and examples/vmdq_dcb/main.c.
struct rte_mempool* __rte_experimental rte_pktmbuf_pool_create_by_ops ( const char *  name,
unsigned int  n,
unsigned int  cache_size,
uint16_t  priv_size,
uint16_t  data_room_size,
int  socket_id,
const char *  ops_name 
)
read

Create a mbuf pool with a given mempool ops name

This function creates and initializes a packet mbuf pool. It is a wrapper to rte_mempool functions.

Parameters
nameThe name of the mbuf pool.
nThe number of elements in the mbuf pool. The optimum size (in terms of memory usage) for a mempool is when n is a power of two minus one: n = (2^q - 1).
cache_sizeSize of the per-core object cache. See rte_mempool_create() for details.
priv_sizeSize of application private are between the rte_mbuf structure and the data buffer. This value must be aligned to RTE_MBUF_PRIV_ALIGN.
data_room_sizeSize of data buffer in each mbuf, including RTE_PKTMBUF_HEADROOM.
socket_idThe socket identifier where the memory should be allocated. The value can be SOCKET_ID_ANY if there is no NUMA constraint for the reserved zone.
ops_nameThe mempool ops name to be used for this mempool instead of default mempool. The value can be NULL to use default mempool.
Returns
The pointer to the new allocated mempool, on success. NULL on error with rte_errno set appropriately. Possible rte_errno values include:
  • E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
  • E_RTE_SECONDARY - function was called from a secondary process instance
  • EINVAL - cache size provided is too large, or priv_size is not aligned.
  • ENOSPC - the maximum number of memzones has already been allocated
  • EEXIST - a memzone with the same name already exists
  • ENOMEM - no appropriate memory area found in which to create memzone
static uint16_t rte_pktmbuf_data_room_size ( struct rte_mempool mp)
inlinestatic

Get the data room size of mbufs stored in a pktmbuf_pool

The data room size is the amount of data that can be stored in a mbuf including the headroom (RTE_PKTMBUF_HEADROOM).

Parameters
mpThe packet mbuf pool.
Returns
The data room size of mbufs stored in this mempool.

Definition at line 1165 of file rte_mbuf.h.

static void rte_pktmbuf_reset_headroom ( struct rte_mbuf m)
inlinestatic

Reset the data_off field of a packet mbuf to its default value.

The given mbuf must have only one segment, which should be empty.

Parameters
mThe packet mbuf's data_off field has to be reset.

Definition at line 1202 of file rte_mbuf.h.

static struct rte_mbuf* rte_pktmbuf_alloc ( struct rte_mempool mp)
staticread

Allocate a new mbuf from a mempool.

This new mbuf contains one segment, which has a length of 0. The pointer to data is initialized to have some bytes of headroom in the buffer (if buffer size allows).

Parameters
mpThe mempool from which the mbuf is allocated.
Returns
  • The pointer to the new mbuf on success.
  • NULL if allocation failed.
Examples:
examples/bond/main.c, examples/exception_path/main.c, examples/ipv4_multicast/main.c, examples/netmap_compat/lib/compat_netmap.c, examples/ptpclient/ptpclient.c, examples/quota_watermark/qw/main.c, and examples/vhost/virtio_net.c.

Definition at line 1249 of file rte_mbuf.h.

static int rte_pktmbuf_alloc_bulk ( struct rte_mempool pool,
struct rte_mbuf **  mbufs,
unsigned  count 
)
inlinestatic

Allocate a bulk of mbufs, initialize refcnt and reset the fields to default values.

Parameters
poolThe mempool from which mbufs are allocated.
mbufsArray of pointers to mbufs
countArray size
Returns
  • 0: Success
  • -ENOENT: Not enough entries in the mempool; no mbufs are retrieved.

Definition at line 1271 of file rte_mbuf.h.

static struct rte_mbuf_ext_shared_info* rte_pktmbuf_ext_shinfo_init_helper ( void *  buf_addr,
uint16_t *  buf_len,
rte_mbuf_extbuf_free_callback_t  free_cb,
void *  fcb_opaque 
)
staticread

Initialize shared data at the end of an external buffer before attaching to a mbuf by rte_pktmbuf_attach_extbuf(). This is not a mandatory initialization but a helper function to simply spare a few bytes at the end of the buffer for shared data. If shared data is allocated separately, this should not be called but application has to properly initialize the shared data according to its need.

Free callback and its argument is saved and the refcnt is set to 1.

Warning
The value of buf_len will be reduced to RTE_PTR_DIFF(shinfo, buf_addr) after this initialization. This shall be used for rte_pktmbuf_attach_extbuf()
Parameters
buf_addrThe pointer to the external buffer.
[in,out]buf_lenThe pointer to length of the external buffer. Input value must be larger than the size of struct rte_mbuf_ext_shared_info and padding for alignment. If not enough, this function will return NULL. Adjusted buffer length will be returned through this pointer.
free_cbFree callback function to call when the external buffer needs to be freed.
fcb_opaqueArgument for the free callback function.
Returns
A pointer to the initialized shared data on success, return NULL otherwise.

Definition at line 1346 of file rte_mbuf.h.

static void __rte_experimental rte_pktmbuf_attach_extbuf ( struct rte_mbuf m,
void *  buf_addr,
rte_iova_t  buf_iova,
uint16_t  buf_len,
struct rte_mbuf_ext_shared_info shinfo 
)
inlinestatic

Attach an external buffer to a mbuf.

User-managed anonymous buffer can be attached to an mbuf. When attaching it, corresponding free callback function and its argument should be provided via shinfo. This callback function will be called once all the mbufs are detached from the buffer (refcnt becomes zero).

The headroom for the attaching mbuf will be set to zero and this can be properly adjusted after attachment. For example, rte_pktmbuf_adj() or rte_pktmbuf_reset_headroom() might be used.

More mbufs can be attached to the same external buffer by rte_pktmbuf_attach() once the external buffer has been attached by this API.

Detachment can be done by either rte_pktmbuf_detach_extbuf() or rte_pktmbuf_detach().

Memory for shared data must be provided and user must initialize all of the content properly, escpecially free callback and refcnt. The pointer of shared data will be stored in m->shinfo. rte_pktmbuf_ext_shinfo_init_helper can help to simply spare a few bytes at the end of buffer for the shared data, store free callback and its argument and set the refcnt to 1. The following is an example:

struct rte_mbuf_ext_shared_info *shinfo = rte_pktmbuf_ext_shinfo_init_helper(buf_addr, &buf_len, free_cb, fcb_arg); rte_pktmbuf_attach_extbuf(m, buf_addr, buf_iova, buf_len, shinfo); rte_pktmbuf_reset_headroom(m); rte_pktmbuf_adj(m, data_len);

Attaching an external buffer is quite similar to mbuf indirection in replacing buffer addresses and length of a mbuf, but a few differences:

  • When an indirect mbuf is attached, refcnt of the direct mbuf would be 2 as long as the direct mbuf itself isn't freed after the attachment. In such cases, the buffer area of a direct mbuf must be read-only. But external buffer has its own refcnt and it starts from 1. Unless multiple mbufs are attached to a mbuf having an external buffer, the external buffer is writable.
  • There's no need to allocate buffer from a mempool. Any buffer can be attached with appropriate free callback and its IO address.
  • Smaller metadata is required to maintain shared data such as refcnt.
Warning
EXPERIMENTAL: This API may change without prior notice. Once external buffer is enabled by allowing experimental API, RTE_MBUF_DIRECT() and RTE_MBUF_INDIRECT() are no longer exclusive. A mbuf can be considered direct if it is neither indirect nor having external buffer.
Parameters
mThe pointer to the mbuf.
buf_addrThe pointer to the external buffer.
buf_iovaIO address of the external buffer.
buf_lenThe size of the external buffer.
shinfoUser-provided memory for shared data of the external buffer.

Definition at line 1431 of file rte_mbuf.h.

static void rte_pktmbuf_attach ( struct rte_mbuf mi,
struct rte_mbuf m 
)
inlinestatic

Attach packet mbuf to another packet mbuf.

If the mbuf we are attaching to isn't a direct buffer and is attached to an external buffer, the mbuf being attached will be attached to the external buffer instead of mbuf indirection.

Otherwise, the mbuf will be indirectly attached. After attachment we refer the mbuf we attached as 'indirect', while mbuf we attached to as 'direct'. The direct mbuf's reference counter is incremented.

Right now, not supported:

  • attachment for already indirect mbuf (e.g. - mi has to be direct).
  • mbuf we trying to attach (mi) is used by someone else e.g. it's reference counter is greater then 1.
Parameters
miThe indirect packet mbuf.
mThe packet mbuf we're attaching to.

Definition at line 1480 of file rte_mbuf.h.

static void rte_pktmbuf_detach ( struct rte_mbuf m)
inlinestatic

Detach a packet mbuf from external buffer or direct buffer.

  • decrement refcnt and free the external/direct buffer if refcnt becomes zero.
  • restore original mbuf address and length values.
  • reset pktmbuf data and data_len to their default values.

All other fields of the given packet mbuf will be left intact.

Parameters
mThe indirect attached packet mbuf.

Definition at line 1571 of file rte_mbuf.h.

static __rte_always_inline struct rte_mbuf* rte_pktmbuf_prefree_seg ( struct rte_mbuf m)
staticread

Decrease reference counter and unlink a mbuf segment

This function does the same than a free, except that it does not return the segment to its pool. It decreases the reference counter, and if it reaches 0, it is detached from its parent for an indirect mbuf.

Parameters
mThe mbuf to be unlinked
Returns
  • (m) if it is the last reference. It can be recycled or freed.
  • (NULL) if the mbuf still has remaining references on it.

Definition at line 1610 of file rte_mbuf.h.

static __rte_always_inline void rte_pktmbuf_free_seg ( struct rte_mbuf m)
static

Free a segment of a packet mbuf into its original mempool.

Free an mbuf, without parsing other segments in case of chained buffers.

Parameters
mThe packet mbuf segment to be freed.

Definition at line 1660 of file rte_mbuf.h.

static void rte_pktmbuf_free ( struct rte_mbuf m)
inlinestatic

Free a packet mbuf back into its original mempool.

Free an mbuf, and all its segments in case of chained buffers. Each segment is added back into its original mempool.

Parameters
mThe packet mbuf to be freed. If NULL, the function does nothing.
Examples:
examples/bbdev_app/main.c, examples/bond/main.c, examples/distributor/main.c, examples/exception_path/main.c, examples/flow_classify/flow_classify.c, examples/flow_filtering/main.c, examples/ip_fragmentation/main.c, examples/ip_reassembly/main.c, examples/ipsec-secgw/ipsec-secgw.c, examples/ipsec-secgw/ipsec.c, examples/ipv4_multicast/main.c, examples/kni/main.c, examples/l2fwd-cat/l2fwd-cat.c, examples/l2fwd-crypto/main.c, examples/l3fwd-acl/main.c, examples/l3fwd-power/main.c, examples/l3fwd-vf/main.c, examples/load_balancer/runtime.c, examples/multi_process/client_server_mp/mp_client/client.c, examples/multi_process/client_server_mp/mp_server/main.c, examples/multi_process/symmetric_mp/main.c, examples/netmap_compat/lib/compat_netmap.c, examples/packet_ordering/main.c, examples/performance-thread/l3fwd-thread/main.c, examples/ptpclient/ptpclient.c, examples/qos_meter/main.c, examples/qos_sched/app_thread.c, examples/quota_watermark/qw/main.c, examples/rxtx_callbacks/main.c, examples/server_node_efd/node/node.c, examples/server_node_efd/server/main.c, examples/skeleton/basicfwd.c, examples/tep_termination/main.c, examples/tep_termination/vxlan_setup.c, examples/vhost/main.c, examples/vhost/virtio_net.c, examples/vmdq/main.c, and examples/vmdq_dcb/main.c.

Definition at line 1676 of file rte_mbuf.h.

static struct rte_mbuf* rte_pktmbuf_clone ( struct rte_mbuf md,
struct rte_mempool mp 
)
staticread

Creates a "clone" of the given packet mbuf.

Walks through all segments of the given packet mbuf, and for each of them:

  • Creates a new packet mbuf from the given pool.
  • Attaches newly created mbuf to the segment. Then updates pkt_len and nb_segs of the "clone" packet mbuf to match values from the original packet mbuf.
Parameters
mdThe packet mbuf to be cloned.
mpThe mempool from which the "clone" mbufs are allocated.
Returns
  • The pointer to the new "clone" mbuf on success.
  • NULL if allocation fails.
Examples:
examples/ipv4_multicast/main.c.

Definition at line 1707 of file rte_mbuf.h.

static void rte_pktmbuf_refcnt_update ( struct rte_mbuf m,
int16_t  v 
)
inlinestatic

Adds given value to the refcnt of all packet mbuf segments.

Walks through all segments of given packet mbuf and for each of them invokes rte_mbuf_refcnt_update().

Parameters
mThe packet mbuf whose refcnt to be updated.
vThe value to add to the mbuf's segments refcnt.
Examples:
examples/ipv4_multicast/main.c.

Definition at line 1755 of file rte_mbuf.h.

static uint16_t rte_pktmbuf_headroom ( const struct rte_mbuf m)
inlinestatic

Get the headroom in a packet mbuf.

Parameters
mThe packet mbuf.
Returns
The length of the headroom.

Definition at line 1772 of file rte_mbuf.h.

static uint16_t rte_pktmbuf_tailroom ( const struct rte_mbuf m)
inlinestatic

Get the tailroom of a packet mbuf.

Parameters
mThe packet mbuf.
Returns
The length of the tailroom.
Examples:
examples/vhost/main.c.

Definition at line 1786 of file rte_mbuf.h.

static struct rte_mbuf* rte_pktmbuf_lastseg ( struct rte_mbuf m)
staticread

Get the last segment of the packet.

Parameters
mThe packet mbuf.
Returns
The last segment of the given mbuf.

Definition at line 1801 of file rte_mbuf.h.

static char* rte_pktmbuf_prepend ( struct rte_mbuf m,
uint16_t  len 
)
inlinestatic

Prepend len bytes to an mbuf data area.

Returns a pointer to the new data start address. If there is not enough headroom in the first segment, the function will return NULL, without modifying the mbuf.

Parameters
mThe pkt mbuf.
lenThe amount of data to prepend (in bytes).
Returns
A pointer to the start of the newly prepended data, or NULL if there is not enough headroom space in the first segment
Examples:
examples/ip_fragmentation/main.c, examples/ipsec-secgw/esp.c, examples/ipsec-secgw/ipsec-secgw.c, examples/ipv4_multicast/main.c, and examples/tep_termination/vxlan.c.

Definition at line 1903 of file rte_mbuf.h.

static char* rte_pktmbuf_append ( struct rte_mbuf m,
uint16_t  len 
)
inlinestatic

Append len bytes to an mbuf.

Append len bytes to an mbuf and return a pointer to the start address of the added data. If there is not enough tailroom in the last segment, the function will return NULL, without modifying the mbuf.

Parameters
mThe packet mbuf.
lenThe amount of data to append (in bytes).
Returns
A pointer to the start of the newly appended data, or NULL if there is not enough tailroom space in the last segment
Examples:
examples/bbdev_app/main.c, examples/ipsec-secgw/esp.c, examples/l2fwd-crypto/main.c, and examples/netmap_compat/lib/compat_netmap.c.

Definition at line 1936 of file rte_mbuf.h.

static char* rte_pktmbuf_adj ( struct rte_mbuf m,
uint16_t  len 
)
inlinestatic

Remove len bytes at the beginning of an mbuf.

Returns a pointer to the start address of the new data area. If the length is greater than the length of the first segment, then the function will fail and return NULL, without modifying the mbuf.

Parameters
mThe packet mbuf.
lenThe amount of data to remove (in bytes).
Returns
A pointer to the new start of the data.
Examples:
examples/ip_fragmentation/main.c, examples/ipsec-secgw/esp.c, examples/ipsec-secgw/ipsec-secgw.c, examples/ipv4_multicast/main.c, and examples/tep_termination/vxlan.c.

Definition at line 1967 of file rte_mbuf.h.

static int rte_pktmbuf_trim ( struct rte_mbuf m,
uint16_t  len 
)
inlinestatic

Remove len bytes of data at the end of the mbuf.

If the length is greater than the length of the last segment, the function will fail and return -1 without modifying the mbuf.

Parameters
mThe packet mbuf.
lenThe amount of data to remove (in bytes).
Returns
  • 0: On success.
  • -1: On error.
Examples:
examples/bbdev_app/main.c, and examples/ipsec-secgw/esp.c.

Definition at line 1997 of file rte_mbuf.h.

static int rte_pktmbuf_is_contiguous ( const struct rte_mbuf m)
inlinestatic

Test if mbuf data is contiguous.

Parameters
mThe packet mbuf.
Returns
  • 1, if all data is contiguous (one segment).
  • 0, if there is several segments.

Definition at line 2021 of file rte_mbuf.h.

static const void* rte_pktmbuf_read ( const struct rte_mbuf m,
uint32_t  off,
uint32_t  len,
void *  buf 
)
inlinestatic

Read len data bytes in a mbuf at specified offset.

If the data is contiguous, return the pointer in the mbuf data, else copy the data in the buffer provided by the user and return its pointer.

Parameters
mThe pointer to the mbuf.
offThe offset of the data in the mbuf.
lenThe amount of bytes to read.
bufThe buffer where data is copied if it is not contiguous in mbuf data. Its length should be at least equal to the len parameter.
Returns
The pointer to the data, either in the mbuf if it is contiguous, or in the user buffer. If mbuf is too small, NULL is returned.

Definition at line 2053 of file rte_mbuf.h.

static int rte_pktmbuf_chain ( struct rte_mbuf head,
struct rte_mbuf tail 
)
inlinestatic

Chain an mbuf to another, thereby creating a segmented packet.

Note: The implementation will do a linear walk over the segments to find the tail entry. For cases when there are many segments, it's better to chain the entries manually.

Parameters
headThe head of the mbuf chain (the first packet)
tailThe mbuf to put last in the chain
Returns
  • 0, on success.
  • -EOVERFLOW, if the chain segment limit exceeded

Definition at line 2078 of file rte_mbuf.h.

static int rte_validate_tx_offload ( const struct rte_mbuf m)
inlinestatic

Validate general requirements for Tx offload in mbuf.

This function checks correctness and completeness of Tx offload settings.

Parameters
mThe packet mbuf to be validated.
Returns
0 if packet is valid

Definition at line 2114 of file rte_mbuf.h.

static int rte_pktmbuf_linearize ( struct rte_mbuf mbuf)
inlinestatic

Linearize data in mbuf.

This function moves the mbuf data in the first segment if there is enough tailroom. The subsequent segments are unchained and freed.

Parameters
mbufmbuf to linearize
Returns
  • 0, on success
  • -1, on error

Definition at line 2171 of file rte_mbuf.h.

void rte_pktmbuf_dump ( FILE *  f,
const struct rte_mbuf m,
unsigned  dump_len 
)

Dump an mbuf structure to a file.

Dump all fields for the given packet mbuf and all its associated segments (in the case of a chained buffer).

Parameters
fA pointer to a file for output
mThe packet mbuf.
dump_lenIf dump_len != 0, also dump the "dump_len" first data bytes of the packet.

Variable Documentation

__extension__ typedef void* MARKER[0]

generic marker for a point in a structure

Definition at line 421 of file rte_mbuf.h.

__extension__ typedef uint8_t MARKER8[0]

generic marker with 1B alignment

Definition at line 423 of file rte_mbuf.h.

__extension__ typedef uint64_t MARKER64[0]

marker that allows us to overwrite 8 bytes with a single assignment

Definition at line 425 of file rte_mbuf.h.

rte_iova_t buf_physaddr

deprecated

Definition at line 447 of file rte_mbuf.h.