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rte_bpf.h(3) DPDK rte_bpf.h(3)

NAME

rte_bpf.h

SYNOPSIS

#include <rte_common.h>
#include <rte_mbuf.h>
#include <bpf_def.h>

Data Structures


struct rte_bpf_arg
struct rte_bpf_xsym
struct rte_bpf_prm
struct rte_bpf_jit

Macros


#define RTE_BPF_ARG_PTR_TYPE(x) ((x) & RTE_BPF_ARG_PTR)

Enumerations


enum rte_bpf_arg_type { RTE_BPF_ARG_UNDEF, RTE_BPF_ARG_RAW, RTE_BPF_ARG_PTR = 0x10, RTE_BPF_ARG_PTR_MBUF, RTE_BPF_ARG_RESERVED }
enum rte_bpf_xtype { RTE_BPF_XTYPE_FUNC, RTE_BPF_XTYPE_VAR }

Functions


void rte_bpf_destroy (struct rte_bpf *bpf)
struct rte_bpf * rte_bpf_load (const struct rte_bpf_prm *prm)
struct rte_bpf * rte_bpf_elf_load (const struct rte_bpf_prm *prm, const char *fname, const char *sname)
uint64_t rte_bpf_exec (const struct rte_bpf *bpf, void *ctx)
uint32_t rte_bpf_exec_burst (const struct rte_bpf *bpf, void *ctx[], uint64_t rc[], uint32_t num)
int rte_bpf_get_jit (const struct rte_bpf *bpf, struct rte_bpf_jit *jit)
void rte_bpf_dump (FILE *f, const struct ebpf_insn *buf, uint32_t len)
struct rte_bpf_prm * rte_bpf_convert (const struct bpf_program *prog)

Detailed Description

RTE BPF support.

librte_bpf provides a framework to load and execute eBPF bytecode inside user-space dpdk based applications. It supports basic set of features from eBPF spec (https://www.kernel.org/doc/Documentation/networking/filter.txt).

Definition in file rte_bpf.h.

Macro Definition Documentation

#define RTE_BPF_ARG_PTR_TYPE(x) ((x) & RTE_BPF_ARG_PTR)

determine is argument a pointer

Definition at line 55 of file rte_bpf.h.

Enumeration Type Documentation

enum rte_bpf_arg_type

Possible types for function/BPF program arguments.

Enumerator

undefined
scalar value
pointer to data buffer
pointer to rte_mbuf
reserved for internal use

Definition at line 30 of file rte_bpf.h.

enum rte_bpf_xtype

Possible types for external symbols.

Enumerator

function
variable

Definition at line 60 of file rte_bpf.h.

Function Documentation

void rte_bpf_destroy (struct rte_bpf * bpf)

De-allocate all memory used by this eBPF execution context.

Parameters

bpf BPF handle to destroy.

struct rte_bpf* rte_bpf_load (const struct rte_bpf_prm * prm)

Create a new eBPF execution context and load given BPF code into it.

Parameters

prm Parameters used to create and initialise the BPF execution context.

Returns

BPF handle that is used in future BPF operations, or NULL on error, with error code set in rte_errno. Possible rte_errno errors include:
  • EINVAL - invalid parameter passed to function
  • ENOMEM - can't reserve enough memory

struct rte_bpf* rte_bpf_elf_load (const struct rte_bpf_prm * prm, const char * fname, const char * sname)

Create a new eBPF execution context and load BPF code from given ELF file into it. Note that if the function will encounter EBPF_PSEUDO_CALL instruction that references external symbol, it will treat is as standard BPF_CALL to the external helper function.

Parameters

prm Parameters used to create and initialise the BPF execution context.
fname Pathname for a ELF file.
sname Name of the executable section within the file to load.

Returns

BPF handle that is used in future BPF operations, or NULL on error, with error code set in rte_errno. Possible rte_errno errors include:
  • EINVAL - invalid parameter passed to function
  • ENOMEM - can't reserve enough memory

uint64_t rte_bpf_exec (const struct rte_bpf * bpf, void * ctx)

Execute given BPF bytecode.

Parameters

bpf handle for the BPF code to execute.
ctx pointer to input context.

Returns

BPF execution return value.

uint32_t rte_bpf_exec_burst (const struct rte_bpf * bpf, void * ctx[], uint64_t rc[], uint32_t num)

Execute given BPF bytecode over a set of input contexts.

Parameters

bpf handle for the BPF code to execute.
ctx array of pointers to the input contexts.
rc array of return values (one per input).
num number of elements in ctx[] (and rc[]).

Returns

number of successfully processed inputs.

int rte_bpf_get_jit (const struct rte_bpf * bpf, struct rte_bpf_jit * jit)

Provide information about natively compiled code for given BPF handle.

Parameters

bpf handle for the BPF code.
jit pointer to the rte_bpf_jit structure to be filled with related data.

Returns

  • -EINVAL if the parameters are invalid.
  • Zero if operation completed successfully.

void rte_bpf_dump (FILE * f, const struct ebpf_insn * buf, uint32_t len)

Dump epf instructions to a file.

Parameters

f A pointer to a file for output
buf A pointer to BPF instructions
len Number of BPF instructions to dump.

struct rte_bpf_prm* rte_bpf_convert (const struct bpf_program * prog)

Convert a Classic BPF program from libpcap into a DPDK BPF code.

Parameters

prog Classic BPF program from pcap_compile().

Returns

Pointer to BPF program (allocated with rte_malloc) that is used in future BPF operations, or NULL on error, with error code set in rte_errno. Possible rte_errno errors include:
  • EINVAL - invalid parameter passed to function
  • ENOMEM - can't reserve enough memory
  • ENOTSUP - operation not supported

Author

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Fri Dec 15 2023 Version 23.11.0