ebpf_helpers.h File Reference

#include <stdint.h>
#include "ebpf_structs.h"

Go to the source code of this file.

Macros
#define	MAX_TAIL_CALL_CNT   32
#define	bpf_map   _ebpf_map_definition_in_file
#define	SEC(name)   __attribute__((section(name), used))

Functions
void *	bpf_map_lookup_elem (struct _ebpf_map_definition_in_file *map, void *key)
	Get a pointer to an entry in the map. More...
int64_t	bpf_map_update_elem (struct _ebpf_map_definition_in_file *map, void *key, void *value, uint64_t flags)
	Insert or update an entry in the map. More...
int64_t	bpf_map_delete_elem (struct _ebpf_map_definition_in_file *map, void *key)
	Remove an entry from the map. More...
int64_t	bpf_tail_call (void *ctx, struct _ebpf_map_definition_in_file *prog_array_map, uint32_t index)
	Perform a tail call into another eBPF program. More...
uint32_t	bpf_get_prandom_u32 ()
	Get a pseudo-random number. More...
uint64_t	bpf_ktime_get_boot_ns ()
	Return time elapsed since boot in nanoseconds. More...
uint64_t	bpf_get_smp_processor_id ()
	Return SMP id of the processor running the program. More...

Macro Definition Documentation

bpf_map

#define bpf_map   _ebpf_map_definition_in_file

MAX_TAIL_CALL_CNT

#define MAX_TAIL_CALL_CNT   32

SEC

#define SEC

(

name

)

__attribute__((section(name), used))

Function Documentation

bpf_get_prandom_u32()

uint32_t bpf_get_prandom_u32

(

)

Get a pseudo-random number.

Returns

A random 32-bit unsigned value.

bpf_get_smp_processor_id()

uint64_t bpf_get_smp_processor_id

(

)

Return SMP id of the processor running the program.

Returns

SMP id of the processor running the program.

bpf_ktime_get_boot_ns()

uint64_t bpf_ktime_get_boot_ns

(

)

Return time elapsed since boot in nanoseconds.

Returns

Time elapsed since boot in nanosecond units.

bpf_map_delete_elem()

int64_t bpf_map_delete_elem	(	struct _ebpf_map_definition_in_file *	map,
		void *	key
	)

Remove an entry from the map.

Parameters

[in]	map	Map to update.
[in]	key	Key to use when searching and updating the map.

Return values

EBPF_SUCCESS	The operation was successful.
-EBPF_INVALID_ARGUMENT	One or more parameters are invalid.

bpf_map_lookup_elem()

void* bpf_map_lookup_elem	(	struct _ebpf_map_definition_in_file *	map,
		void *	key
	)

Get a pointer to an entry in the map.

Parameters

[in]	map	Map to search.
[in]	key	Key to use when searching map.

Returns

Pointer to the value if found or NULL.

bpf_map_update_elem()

int64_t bpf_map_update_elem	(	struct _ebpf_map_definition_in_file *	map,
		void *	key,
		void *	value,
		uint64_t	flags
	)

Insert or update an entry in the map.

Parameters

[in]	map	Map to update.
[in]	key	Key to use when searching and updating the map.
[in]	value	Value to insert into the map.
[in]	flags	Map flags.

Return values

EBPF_SUCCESS	The operation was successful.
-EBPF_NO_MEMORY	Unable to allocate resources for this entry.

bpf_tail_call()

int64_t bpf_tail_call	(	void *	ctx,
		struct _ebpf_map_definition_in_file *	prog_array_map,
		uint32_t	index
	)

Perform a tail call into another eBPF program.

Parameters

[in]	ctx	Context to pass to the called program.
[in]	prog_array_map	Map of program fds.
[in]	index	Index in map of program to call.

Return values

EBPF_SUCCESS	The operation was successful.
-EBPF_INVALID_ARGUMENT	One or more parameters are invalid.