DPDK: Data Plane Development Kit

18.08.0-rc1
rte_gro.h File Reference
#include <stdint.h>
#include <rte_mbuf.h>

Go to the source code of this file.

Data Structures

struct  rte_gro_param

Macros

#define RTE_GRO_MAX_BURST_ITEM_NUM   128U
#define RTE_GRO_TYPE_MAX_NUM   64
#define RTE_GRO_TYPE_SUPPORT_NUM   2
#define RTE_GRO_TCP_IPV4   (1ULL << RTE_GRO_TCP_IPV4_INDEX)
#define RTE_GRO_IPV4_VXLAN_TCP_IPV4   (1ULL << RTE_GRO_IPV4_VXLAN_TCP_IPV4_INDEX)

Functions

void * rte_gro_ctx_create (const struct rte_gro_param *param)
void rte_gro_ctx_destroy (void *ctx)
uint16_t rte_gro_reassemble_burst (struct rte_mbuf **pkts, uint16_t nb_pkts, const struct rte_gro_param *param)
uint16_t rte_gro_reassemble (struct rte_mbuf **pkts, uint16_t nb_pkts, void *ctx)
uint16_t rte_gro_timeout_flush (void *ctx, uint64_t timeout_cycles, uint64_t gro_types, struct rte_mbuf **out, uint16_t max_nb_out)
uint64_t rte_gro_get_pkt_count (void *ctx)

Detailed Description

Interface to GRO library

Definition in file rte_gro.h.

Macro Definition Documentation

#define RTE_GRO_MAX_BURST_ITEM_NUM   128U

the max number of packets that rte_gro_reassemble_burst() can process in each invocation.

Definition at line 20 of file rte_gro.h.

#define RTE_GRO_TYPE_MAX_NUM   64

the max number of supported GRO types

Definition at line 24 of file rte_gro.h.

#define RTE_GRO_TYPE_SUPPORT_NUM   2

the number of currently supported GRO types

Definition at line 26 of file rte_gro.h.

#define RTE_GRO_TCP_IPV4   (1ULL << RTE_GRO_TCP_IPV4_INDEX)

TCP/IPv4 GRO flag

Definition at line 30 of file rte_gro.h.

#define RTE_GRO_IPV4_VXLAN_TCP_IPV4   (1ULL << RTE_GRO_IPV4_VXLAN_TCP_IPV4_INDEX)

VxLAN GRO flag.

Definition at line 33 of file rte_gro.h.

Function Documentation

void* rte_gro_ctx_create ( const struct rte_gro_param param)
Warning
EXPERIMENTAL: this API may change without prior notice

This function create a GRO context object, which is used to merge packets in rte_gro_reassemble().

Parameters
paramapplications use it to pass needed parameters to create a GRO context object.
Returns
if create successfully, return a pointer which points to the GRO context object. Otherwise, return NULL.
void rte_gro_ctx_destroy ( void *  ctx)
Warning
EXPERIMENTAL: this API may change without prior notice

This function destroys a GRO context object.

Parameters
ctxpointer points to a GRO context object.
uint16_t rte_gro_reassemble_burst ( struct rte_mbuf **  pkts,
uint16_t  nb_pkts,
const struct rte_gro_param param 
)

This is one of the main reassembly APIs, which merges numbers of packets at a time. It doesn't check if input packets have correct checksums and doesn't re-calculate checksums for merged packets. It assumes the packets are complete (i.e., MF==0 && frag_off==0), when IP fragmentation is possible (i.e., DF==0). The GROed packets are returned as soon as the function finishes.

Parameters
pktsPointer array pointing to the packets to reassemble. Besides, it keeps MBUF addresses for the GROed packets.
nb_pktsThe number of packets to reassemble
paramApplication-determined parameters for reassembling packets.
Returns
The number of packets after been GROed. If no packets are merged, the return value is equals to nb_pkts.
uint16_t rte_gro_reassemble ( struct rte_mbuf **  pkts,
uint16_t  nb_pkts,
void *  ctx 
)
Warning
EXPERIMENTAL: this API may change without prior notice

Reassembly function, which tries to merge input packets with the existed packets in the reassembly tables of a given GRO context. It doesn't check if input packets have correct checksums and doesn't re-calculate checksums for merged packets. Additionally, it assumes the packets are complete (i.e., MF==0 && frag_off==0), when IP fragmentation is possible (i.e., DF==0).

If the input packets have invalid parameters (e.g. no data payload, unsupported GRO types), they are returned to applications. Otherwise, they are either merged or inserted into the table. Applications need to flush packets from the tables by flush API, if they want to get the GROed packets.

Parameters
pktsPackets to reassemble. It's also used to store the unprocessed packets.
nb_pktsThe number of packets to reassemble
ctxGRO context object pointer
Returns
The number of unprocessed packets.
uint16_t rte_gro_timeout_flush ( void *  ctx,
uint64_t  timeout_cycles,
uint64_t  gro_types,
struct rte_mbuf **  out,
uint16_t  max_nb_out 
)
Warning
EXPERIMENTAL: this API may change without prior notice

This function flushes the timeout packets from the reassembly tables of desired GRO types. The max number of flushed packets is the element number of 'out'.

Additionally, the flushed packets may have incorrect checksums, since this function doesn't re-calculate checksums for merged packets.

Parameters
ctxGRO context object pointer.
timeout_cyclesThe max TTL for packets in reassembly tables, measured in nanosecond.
gro_typesThis function flushes packets whose GRO types are specified by gro_types.
outPointer array used to keep flushed packets.
max_nb_outThe element number of 'out'. It's also the max number of timeout packets that can be flushed finally.
Returns
The number of flushed packets.
uint64_t rte_gro_get_pkt_count ( void *  ctx)
Warning
EXPERIMENTAL: this API may change without prior notice

This function returns the number of packets in all reassembly tables of a given GRO context.

Parameters
ctxGRO context object pointer.
Returns
The number of packets in the tables.