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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/test_xdp_with_cpumap_helpers.c
Extension
.c
Size
818 bytes
Lines
48
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

// SPDX-License-Identifier: GPL-2.0

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>

#define IFINDEX_LO	1

struct {
	__uint(type, BPF_MAP_TYPE_CPUMAP);
	__uint(key_size, sizeof(__u32));
	__uint(value_size, sizeof(struct bpf_cpumap_val));
	__uint(max_entries, 4);
} cpu_map SEC(".maps");

__u32 redirect_count = 0;

SEC("xdp")
int xdp_redir_prog(struct xdp_md *ctx)
{
	return bpf_redirect_map(&cpu_map, 0, 0);
}

SEC("xdp")
int xdp_dummy_prog(struct xdp_md *ctx)
{
	return XDP_PASS;
}

SEC("xdp/cpumap")
int xdp_dummy_cm(struct xdp_md *ctx)
{
	if (bpf_get_smp_processor_id() == 0)
		redirect_count++;

	if (ctx->ingress_ifindex == IFINDEX_LO)
		return XDP_DROP;

	return XDP_PASS;
}

SEC("xdp.frags/cpumap")
int xdp_dummy_cm_frags(struct xdp_md *ctx)
{
	return XDP_PASS;
}

char _license[] SEC("license") = "GPL";

Annotation

Implementation Notes