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

File Facts

System

Linux kernel

Corpus path

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

Extension

.c

Size

618 bytes

Lines

38

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.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/bpf.h
• bpf/bpf_helpers.h
• bpf_compiler.h

Detected Declarations

• function process

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

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

#include "bpf_compiler.h"

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

SEC("tc")
int process(struct __sk_buff *skb)
{
	__pragma_loop_unroll_full
	for (int i = 0; i < 5; i++) {
		if (skb->cb[i] != i + 1)
			return 1;
		skb->cb[i]++;
	}
	skb->priority++;
	skb->tstamp++;
	skb->mark++;

	if (skb->wire_len != 100)
		return 1;
	if (skb->gso_segs != 8)
		return 1;
	if (skb->gso_size != 10)
		return 1;
	if (skb->ingress_ifindex != 11)
		return 1;
	if (skb->ifindex != 1)
		return 1;
	if (skb->hwtstamp != 11)
		return 1;

	return 0;
}

Annotation

• Immediate include surface: `linux/bpf.h`, `bpf/bpf_helpers.h`, `bpf_compiler.h`.
• Detected declarations: `function process`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.