net/ipv4/tcp_bbr.c

File Facts

System

Linux kernel

Corpus path

net/ipv4/tcp_bbr.c

Extension

.c

Size

42814 bytes

Lines

1201

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/btf.h
• linux/btf_ids.h
• linux/module.h
• net/tcp.h
• linux/inet_diag.h
• linux/inet.h
• linux/random.h
• linux/win_minmax.h

Detected Declarations

• struct bbr
• enum bbr_mode
• function bbr_full_bw_reached
• function bbr_max_bw
• function bbr_bw
• function bbr_extra_acked
• function bbr_rate_bytes_per_sec
• function bbr_bw_to_pacing_rate
• function bbr_init_pacing_rate_from_rtt
• function bbr_set_pacing_rate
• function bbr_min_tso_segs
• function bbr_tso_segs_goal
• function bbr_save_cwnd
• function bbr_cwnd_event_tx_start
• function measurements
• function bbr_quantization_budget
• function bbr_inflight
• function time
• function bbr_ack_aggregation_cwnd
• function started
• function bbr_set_cwnd
• function bbr_is_next_cycle_phase
• function bbr_advance_cycle_phase
• function bbr_update_cycle_phase
• function bbr_reset_startup_mode
• function bbr_reset_probe_bw_mode
• function bbr_reset_mode
• function bbr_reset_lt_bw_sampling_interval
• function bbr_reset_lt_bw_sampling
• function bbr_lt_bw_interval_done
• function bbr_lt_bw_sampling
• function bbr_update_bw
• function bbr_extra_acked_max_us
• function bbr_full_bw_thresh
• function bbr_check_drain
• function bbr_check_probe_rtt_done
• function min_rtt
• function bbr_update_gains
• function bbr_update_model
• function bbr_main
• function bbr_init
• function bbr_sndbuf_expand
• function losses
• function bbr_ssthresh
• function bbr_get_info
• function bbr_set_state
• function bbr_register
• function bbr_unregister

Annotated Snippet

module_init(bbr_register);
module_exit(bbr_unregister);

MODULE_AUTHOR("Van Jacobson <vanj@google.com>");
MODULE_AUTHOR("Neal Cardwell <ncardwell@google.com>");
MODULE_AUTHOR("Yuchung Cheng <ycheng@google.com>");
MODULE_AUTHOR("Soheil Hassas Yeganeh <soheil@google.com>");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("TCP BBR (Bottleneck Bandwidth and RTT)");

Annotation

• Immediate include surface: `linux/btf.h`, `linux/btf_ids.h`, `linux/module.h`, `net/tcp.h`, `linux/inet_diag.h`, `linux/inet.h`, `linux/random.h`, `linux/win_minmax.h`.
• Detected declarations: `struct bbr`, `enum bbr_mode`, `function bbr_full_bw_reached`, `function bbr_max_bw`, `function bbr_bw`, `function bbr_extra_acked`, `function bbr_rate_bytes_per_sec`, `function bbr_bw_to_pacing_rate`, `function bbr_init_pacing_rate_from_rtt`, `function bbr_set_pacing_rate`.
• 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.