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

File Facts

System

Linux kernel

Corpus path

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

Extension

.c

Size

2348 bytes

Lines

130

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

• stdbool.h
• linux/bpf.h
• linux/if_ether.h
• linux/stddef.h
• linux/if_packet.h
• bpf/bpf_endian.h
• bpf/bpf_helpers.h
• bpf/bpf_core_read.h

Detected Declarations

• struct sk_buff
• struct net_device
• function tc1
• function tc2
• function tc3
• function tc4
• function tc5
• function tc6
• function tc7
• function tc8

Annotated Snippet

struct sk_buff {
	struct net_device *dev;
};

struct net_device {
	unsigned short needed_headroom;
	unsigned short needed_tailroom;
};

SEC("tc/egress")
int tc8(struct __sk_buff *skb)
{
	struct net_device *dev = BPF_CORE_READ((struct sk_buff *)skb, dev);

	seen_tc8 = true;
	mark = skb->mark;
	prio = skb->priority;
	headroom = BPF_CORE_READ(dev, needed_headroom);
	tailroom = BPF_CORE_READ(dev, needed_tailroom);
	return TCX_PASS;
}

Annotation

• Immediate include surface: `stdbool.h`, `linux/bpf.h`, `linux/if_ether.h`, `linux/stddef.h`, `linux/if_packet.h`, `bpf/bpf_endian.h`, `bpf/bpf_helpers.h`, `bpf/bpf_core_read.h`.
• Detected declarations: `struct sk_buff`, `struct net_device`, `function tc1`, `function tc2`, `function tc3`, `function tc4`, `function tc5`, `function tc6`, `function tc7`, `function tc8`.
• 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.