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rte_ip_frag.h(3) DPDK rte_ip_frag.h(3)

NAME

rte_ip_frag.h

SYNOPSIS

#include <stdint.h>
#include <stdio.h>
#include <rte_config.h>
#include <rte_malloc.h>
#include <rte_memory.h>
#include <rte_ip.h>
#include <rte_byteorder.h>

Data Structures


struct rte_ip_frag_death_row

Macros


#define RTE_IP_FRAG_DEATH_ROW_LEN 32
#define RTE_IP_FRAG_DEATH_ROW_MBUF_LEN (RTE_IP_FRAG_DEATH_ROW_LEN * (RTE_LIBRTE_IP_FRAG_MAX_FRAG + 1))

Obsolete macros, kept here for compatibility reasons.
Will be deprecated/removed in future DPDK releases.



#define IP_FRAG_DEATH_ROW_LEN RTE_IP_FRAG_DEATH_ROW_LEN
#define IP_FRAG_DEATH_ROW_MBUF_LEN RTE_IP_FRAG_DEATH_ROW_MBUF_LEN
#define ipv6_extension_fragment rte_ipv6_fragment_ext


Functions


struct rte_ip_frag_tbl * rte_ip_frag_table_create (uint32_t bucket_num, uint32_t bucket_entries, uint32_t max_entries, uint64_t max_cycles, int socket_id)
void rte_ip_frag_table_destroy (struct rte_ip_frag_tbl *tbl)
int32_t rte_ipv6_fragment_packet (struct rte_mbuf *pkt_in, struct rte_mbuf **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size, struct rte_mempool *pool_direct, struct rte_mempool *pool_indirect)
struct rte_mbuf * rte_ipv6_frag_reassemble_packet (struct rte_ip_frag_tbl *tbl, struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms, struct rte_ipv6_hdr *ip_hdr, struct rte_ipv6_fragment_ext *frag_hdr)
static struct rte_ipv6_fragment_ext * rte_ipv6_frag_get_ipv6_fragment_header (struct rte_ipv6_hdr *hdr)
int32_t rte_ipv4_fragment_packet (struct rte_mbuf *pkt_in, struct rte_mbuf **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size, struct rte_mempool *pool_direct, struct rte_mempool *pool_indirect)
int32_t rte_ipv4_fragment_copy_nonseg_packet (struct rte_mbuf *pkt_in, struct rte_mbuf **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size, struct rte_mempool *pool_direct)
struct rte_mbuf * rte_ipv4_frag_reassemble_packet (struct rte_ip_frag_tbl *tbl, struct rte_ip_frag_death_row *dr, struct rte_mbuf *mb, uint64_t tms, struct rte_ipv4_hdr *ip_hdr)
static int rte_ipv4_frag_pkt_is_fragmented (const struct rte_ipv4_hdr *hdr)
void rte_ip_frag_free_death_row (struct rte_ip_frag_death_row *dr, uint32_t prefetch)
void rte_ip_frag_table_statistics_dump (FILE *f, const struct rte_ip_frag_tbl *tbl)
void rte_ip_frag_table_del_expired_entries (struct rte_ip_frag_tbl *tbl, struct rte_ip_frag_death_row *dr, uint64_t tms)

Detailed Description

RTE IP Fragmentation and Reassembly

Implementation of IP packet fragmentation and reassembly.

Definition in file rte_ip_frag.h.

Macro Definition Documentation

#define RTE_IP_FRAG_DEATH_ROW_LEN 32

death row size (in packets)

Definition at line 31 of file rte_ip_frag.h.

#define RTE_IP_FRAG_DEATH_ROW_MBUF_LEN (RTE_IP_FRAG_DEATH_ROW_LEN * (RTE_LIBRTE_IP_FRAG_MAX_FRAG + 1))

death row size in mbufs

Definition at line 34 of file rte_ip_frag.h.

#define IP_FRAG_DEATH_ROW_LEN RTE_IP_FRAG_DEATH_ROW_LEN

Obsolete

Definition at line 298 of file rte_ip_frag.h.

#define IP_FRAG_DEATH_ROW_MBUF_LEN RTE_IP_FRAG_DEATH_ROW_MBUF_LEN

Obsolete

Definition at line 300 of file rte_ip_frag.h.

#define ipv6_extension_fragment rte_ipv6_fragment_ext

Obsolete

Definition at line 302 of file rte_ip_frag.h.

Function Documentation

struct rte_ip_frag_tbl* rte_ip_frag_table_create (uint32_t bucket_num, uint32_t bucket_entries, uint32_t max_entries, uint64_t max_cycles, int socket_id)

Create a new IP fragmentation table.

Parameters

bucket_num Number of buckets in the hash table.
bucket_entries Number of entries per bucket (e.g. hash associativity). Should be power of two.
max_entries Maximum number of entries that could be stored in the table. The value should be less or equal then bucket_num * bucket_entries.
max_cycles Maximum TTL in cycles for each fragmented packet.
socket_id The socket_id argument is the socket identifier in the case of NUMA. The value can be SOCKET_ID_ANY if there is no NUMA constraints.

Returns

The pointer to the new allocated fragmentation table, on success. NULL on error.

void rte_ip_frag_table_destroy (struct rte_ip_frag_tbl * tbl)

Free allocated IP fragmentation table.

Parameters

tbl Fragmentation table to free.

int32_t rte_ipv6_fragment_packet (struct rte_mbuf * pkt_in, struct rte_mbuf ** pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size, struct rte_mempool * pool_direct, struct rte_mempool * pool_indirect)

This function implements the fragmentation of IPv6 packets.

Parameters

pkt_in The input packet.
pkts_out Array storing the output fragments.
nb_pkts_out Number of fragments.
mtu_size Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv6 datagrams. This value includes the size of the IPv6 header.
pool_direct MBUF pool used for allocating direct buffers for the output fragments.
pool_indirect MBUF pool used for allocating indirect buffers for the output fragments.

Returns

Upon successful completion - number of output fragments placed in the pkts_out array. Otherwise - (-1) * errno.

struct rte_mbuf* rte_ipv6_frag_reassemble_packet (struct rte_ip_frag_tbl * tbl, struct rte_ip_frag_death_row * dr, struct rte_mbuf * mb, uint64_t tms, struct rte_ipv6_hdr * ip_hdr, struct rte_ipv6_fragment_ext * frag_hdr)

This function implements reassembly of fragmented IPv6 packets. Incoming mbuf should have its l2_len/l3_len fields setup correctly.

Parameters

tbl Table where to lookup/add the fragmented packet.
dr Death row to free buffers to
mb Incoming mbuf with IPv6 fragment.
tms Fragment arrival timestamp.
ip_hdr Pointer to the IPv6 header.
frag_hdr Pointer to the IPv6 fragment extension header.

Returns

Pointer to mbuf for reassembled packet, or NULL if:
  • an error occurred.
  • not all fragments of the packet are collected yet.

static struct rte_ipv6_fragment_ext* rte_ipv6_frag_get_ipv6_fragment_header (struct rte_ipv6_hdr * hdr) [inline], [static]

Return a pointer to the packet's fragment header, if found. It only looks at the extension header that's right after the fixed IPv6 header, and doesn't follow the whole chain of extension headers.

Parameters

hdr Pointer to the IPv6 header.

Returns

Pointer to the IPv6 fragment extension header, or NULL if it's not present.

Definition at line 143 of file rte_ip_frag.h.

int32_t rte_ipv4_fragment_packet (struct rte_mbuf * pkt_in, struct rte_mbuf ** pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size, struct rte_mempool * pool_direct, struct rte_mempool * pool_indirect)

IPv4 fragmentation.

This function implements the fragmentation of IPv4 packets.

Parameters

pkt_in The input packet.
pkts_out Array storing the output fragments.
nb_pkts_out Number of fragments.
mtu_size Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv4 datagrams. This value includes the size of the IPv4 header.
pool_direct MBUF pool used for allocating direct buffers for the output fragments.
pool_indirect MBUF pool used for allocating indirect buffers for the output fragments.

Returns

Upon successful completion - number of output fragments placed in the pkts_out array. Otherwise - (-1) * errno.

int32_t rte_ipv4_fragment_copy_nonseg_packet (struct rte_mbuf * pkt_in, struct rte_mbuf ** pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size, struct rte_mempool * pool_direct)

IPv4 fragmentation by copy.

This function implements the fragmentation of IPv4 packets by copy non-segmented mbuf. This function is mainly used to adapt Tx MBUF_FAST_FREE offload. MBUF_FAST_FREE: Device supports optimization for fast release of mbufs. When set, application must guarantee that per-queue all mbufs comes from the same mempool, has refcnt = 1, direct and non-segmented.

Parameters

pkt_in The input packet.
pkts_out Array storing the output fragments.
nb_pkts_out Number of fragments.
mtu_size Size in bytes of the Maximum Transfer Unit (MTU) for the outgoing IPv4 datagrams. This value includes the size of the IPv4 header.
pool_direct MBUF pool used for allocating direct buffers for the output fragments.

Returns

Upon successful completion - number of output fragments placed in the pkts_out array. Otherwise - (-1) * errno.

struct rte_mbuf* rte_ipv4_frag_reassemble_packet (struct rte_ip_frag_tbl * tbl, struct rte_ip_frag_death_row * dr, struct rte_mbuf * mb, uint64_t tms, struct rte_ipv4_hdr * ip_hdr)

This function implements reassembly of fragmented IPv4 packets. Incoming mbufs should have its l2_len/l3_len fields setup correctly.

Parameters

tbl Table where to lookup/add the fragmented packet.
dr Death row to free buffers to
mb Incoming mbuf with IPv4 fragment.
tms Fragment arrival timestamp.
ip_hdr Pointer to the IPV4 header inside the fragment.

Returns

Pointer to mbuf for reassembled packet, or NULL if:
  • an error occurred.
  • not all fragments of the packet are collected yet.

static int rte_ipv4_frag_pkt_is_fragmented (const struct rte_ipv4_hdr * hdr) [inline], [static]

Check if the IPv4 packet is fragmented

Parameters

hdr IPv4 header of the packet

Returns

1 if fragmented, 0 if not fragmented

Definition at line 246 of file rte_ip_frag.h.

void rte_ip_frag_free_death_row (struct rte_ip_frag_death_row * dr, uint32_t prefetch)

Free mbufs on a given death row.

Parameters

dr Death row to free mbufs in.
prefetch How many buffers to prefetch before freeing.

void rte_ip_frag_table_statistics_dump (FILE * f, const struct rte_ip_frag_tbl * tbl)

Dump fragmentation table statistics to file.

Parameters

f File to dump statistics to
tbl Fragmentation table to dump statistics from

void rte_ip_frag_table_del_expired_entries (struct rte_ip_frag_tbl * tbl, struct rte_ip_frag_death_row * dr, uint64_t tms)

Delete expired fragments

Parameters

tbl Table to delete expired fragments from
dr Death row to free buffers to
tms Current timestamp

Author

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Fri Dec 15 2023 Version 23.11.0