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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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Thu May 23 2024 Version 23.11.0