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

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/freplace_progmap.c
Extension
.c
Size
473 bytes
Lines
25
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>

struct {
	__uint(type, BPF_MAP_TYPE_CPUMAP);
	__type(key, __u32);
	__type(value, struct bpf_cpumap_val);
	__uint(max_entries, 1);
} cpu_map SEC(".maps");

SEC("xdp/cpumap")
int xdp_drop_prog(struct xdp_md *ctx)
{
	return XDP_DROP;
}

SEC("freplace")
int xdp_cpumap_prog(struct xdp_md *ctx)
{
	return bpf_redirect_map(&cpu_map, 0, XDP_PASS);
}

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

Annotation

Implementation Notes