tools/testing/selftests/bpf/progs/for_each_multi_maps.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/for_each_multi_maps.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/for_each_multi_maps.c
Extension
.c
Size
919 bytes
Lines
50
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct callback_ctx {
	int output;
};

u32 data_output = 0;
int use_array = 0;

static __u64
check_map_elem(struct bpf_map *map, __u32 *key, __u64 *val,
	       struct callback_ctx *data)
{
	data->output += *val;
	return 0;
}

SEC("tc")
int test_pkt_access(struct __sk_buff *skb)
{
	struct callback_ctx data;

	data.output = 0;
	if (use_array)
		bpf_for_each_map_elem(&arraymap, check_map_elem, &data, 0);
	else
		bpf_for_each_map_elem(&hashmap, check_map_elem, &data, 0);
	data_output = data.output;

	return 0;
}

Annotation

Implementation Notes