net/sched/sch_fifo.c

File Facts

System

Linux kernel

Corpus path

net/sched/sch_fifo.c

Extension

.c

Size

6369 bytes

Lines

277

Domain

Networking Core

Bucket

Sockets, Protocols, Packet Path, And Network Policy

Inferred role

Networking Core: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

• Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/module.h
• linux/slab.h
• linux/types.h
• linux/kernel.h
• linux/errno.h
• linux/skbuff.h
• net/pkt_sched.h
• net/pkt_cls.h

Detected Declarations

• function bfifo_enqueue
• function pfifo_enqueue
• function pfifo_tail_enqueue
• function fifo_offload_init
• function fifo_offload_destroy
• function fifo_offload_dump
• function __fifo_init
• function fifo_init
• function fifo_hd_init
• function fifo_destroy
• function __fifo_dump
• function fifo_dump
• function fifo_hd_dump
• function fifo_set_limit
• export pfifo_qdisc_ops
• export bfifo_qdisc_ops
• export fifo_set_limit
• export fifo_create_dflt

Annotated Snippet

if (err < 0) {
			qdisc_put(q);
			q = NULL;
		}
	}

	return q ? : ERR_PTR(err);
}
EXPORT_SYMBOL(fifo_create_dflt);
MODULE_DESCRIPTION("Single queue packet and byte based First In First Out(P/BFIFO) scheduler");

Annotation

• Immediate include surface: `linux/module.h`, `linux/slab.h`, `linux/types.h`, `linux/kernel.h`, `linux/errno.h`, `linux/skbuff.h`, `net/pkt_sched.h`, `net/pkt_cls.h`.
• Detected declarations: `function bfifo_enqueue`, `function pfifo_enqueue`, `function pfifo_tail_enqueue`, `function fifo_offload_init`, `function fifo_offload_destroy`, `function fifo_offload_dump`, `function __fifo_init`, `function fifo_init`, `function fifo_hd_init`, `function fifo_destroy`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: integration 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.