net/core/drop_monitor.c

File Facts

System

Linux kernel

Corpus path

net/core/drop_monitor.c

Extension

.c

Size

42819 bytes

Lines

1789

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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• 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/netdevice.h
• linux/etherdevice.h
• linux/string.h
• linux/if_arp.h
• linux/inetdevice.h
• linux/inet.h
• linux/interrupt.h
• linux/netpoll.h
• linux/sched.h
• linux/delay.h
• linux/types.h
• linux/workqueue.h
• linux/netlink.h
• linux/net_dropmon.h
• linux/bitfield.h
• linux/percpu.h
• linux/timer.h
• linux/bitops.h
• linux/slab.h
• linux/module.h
• net/genetlink.h
• net/netevent.h
• net/flow_offload.h
• net/dropreason.h
• net/devlink.h
• trace/events/skb.h
• trace/events/napi.h
• trace/events/devlink.h
• linux/unaligned.h

Detected Declarations

• struct net_dm_stats
• struct net_dm_hw_entry
• struct net_dm_hw_entries
• struct per_cpu_dm_data
• struct dm_hw_stat_delta
• struct net_dm_alert_ops
• struct net_dm_skb_cb
• function send_dm_alert
• function sched_send_work
• function trace_drop_common
• function trace_kfree_skb_hit
• function trace_napi_poll_hit
• function net_dm_hw_reset_per_cpu_data
• function net_dm_hw_entry_put
• function net_dm_hw_entries_put
• function net_dm_hw_summary_report_fill
• function net_dm_hw_summary_work
• function net_dm_hw_trap_summary_probe
• function net_dm_packet_trace_kfree_skb_hit
• function net_dm_packet_trace_napi_poll_hit
• function net_dm_packet_report_size
• function net_dm_packet_report_in_port_put
• function net_dm_packet_report_fill
• function strlen
• function net_dm_packet_report
• function net_dm_packet_work
• function net_dm_flow_action_cookie_size
• function net_dm_hw_packet_report_size
• function net_dm_hw_packet_report_fill
• function net_dm_hw_metadata_copy
• function net_dm_hw_metadata_free
• function net_dm_hw_packet_report
• function net_dm_hw_packet_work
• function net_dm_hw_trap_packet_probe
• function net_dm_hw_probe_register
• function net_dm_hw_probe_unregister
• function net_dm_hw_probe_register
• function net_dm_hw_probe_unregister
• function for_each_possible_cpu
• function net_dm_hw_monitor_stop
• function for_each_possible_cpu
• function net_dm_trace_on_set
• function for_each_possible_cpu
• function net_dm_trace_off_set
• function set_all_monitor_traces
• function net_dm_is_monitoring
• function net_dm_alert_mode_get_from_info
• function net_dm_alert_mode_set

Annotated Snippet

module_init(init_net_drop_monitor);
module_exit(exit_net_drop_monitor);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>");
MODULE_ALIAS_GENL_FAMILY("NET_DM");
MODULE_DESCRIPTION("Monitoring code for network dropped packet alerts");

Annotation

• Immediate include surface: `linux/netdevice.h`, `linux/etherdevice.h`, `linux/string.h`, `linux/if_arp.h`, `linux/inetdevice.h`, `linux/inet.h`, `linux/interrupt.h`, `linux/netpoll.h`.
• Detected declarations: `struct net_dm_stats`, `struct net_dm_hw_entry`, `struct net_dm_hw_entries`, `struct per_cpu_dm_data`, `struct dm_hw_stat_delta`, `struct net_dm_alert_ops`, `struct net_dm_skb_cb`, `function send_dm_alert`, `function sched_send_work`, `function trace_drop_common`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.