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+.. SPDX-License-Identifier: GPL-2.0
+.. Copyright (C) 2023 Google LLC
+
+===========================================
+netns_ipv4 struct fast path usage breakdown
+===========================================
+
+=============================== ============================================ =================== =================== =================================================
+Type Name fastpath_tx_access fastpath_rx_access comment
+=============================== ============================================ =================== =================== =================================================
+struct_inet_timewait_death_row tcp_death_row
+struct_udp_table* udp_table
+struct_ctl_table_header* forw_hdr
+struct_ctl_table_header* frags_hdr
+struct_ctl_table_header* ipv4_hdr
+struct_ctl_table_header* route_hdr
+struct_ctl_table_header* xfrm4_hdr
+struct_ipv4_devconf* devconf_all
+struct_ipv4_devconf* devconf_dflt
+struct_ip_ra_chain ra_chain
+struct_mutex ra_mutex
+struct_fib_rules_ops* rules_ops
+struct_fib_table fib_main
+struct_fib_table fib_default
+unsigned_int fib_rules_require_fldissect
+bool fib_has_custom_rules
+bool fib_has_custom_local_routes
+bool fib_offload_disabled
+atomic_t fib_num_tclassid_users
+struct_hlist_head* fib_table_hash
+struct_sock* fibnl
+struct_sock* mc_autojoin_sk
+struct_inet_peer_base* peers
+struct_fqdir* fqdir
+u8 sysctl_icmp_echo_ignore_all
+u8 sysctl_icmp_echo_enable_probe
+u8 sysctl_icmp_echo_ignore_broadcasts
+u8 sysctl_icmp_ignore_bogus_error_responses
+u8 sysctl_icmp_errors_use_inbound_ifaddr
+int sysctl_icmp_ratelimit
+int sysctl_icmp_ratemask
+u32 ip_rt_min_pmtu
+int ip_rt_mtu_expires
+int ip_rt_min_advmss
+struct_local_ports ip_local_ports
+u8 sysctl_tcp_ecn
+u8 sysctl_tcp_ecn_fallback
+u8 sysctl_ip_default_ttl ip4_dst_hoplimit/ip_select_ttl
+u8 sysctl_ip_no_pmtu_disc
+u8 sysctl_ip_fwd_use_pmtu read_mostly ip_dst_mtu_maybe_forward/ip_skb_dst_mtu
+u8 sysctl_ip_fwd_update_priority ip_forward
+u8 sysctl_ip_nonlocal_bind
+u8 sysctl_ip_autobind_reuse
+u8 sysctl_ip_dynaddr
+u8 sysctl_ip_early_demux read_mostly ip(6)_rcv_finish_core
+u8 sysctl_raw_l3mdev_accept
+u8 sysctl_tcp_early_demux read_mostly ip(6)_rcv_finish_core
+u8 sysctl_udp_early_demux
+u8 sysctl_nexthop_compat_mode
+u8 sysctl_fwmark_reflect
+u8 sysctl_tcp_fwmark_accept
+u8 sysctl_tcp_l3mdev_accept read_mostly __inet6_lookup_established/inet_request_bound_dev_if
+u8 sysctl_tcp_mtu_probing
+int sysctl_tcp_mtu_probe_floor
+int sysctl_tcp_base_mss
+int sysctl_tcp_min_snd_mss read_mostly __tcp_mtu_to_mss(tcp_write_xmit)
+int sysctl_tcp_probe_threshold tcp_mtu_probe(tcp_write_xmit)
+u32 sysctl_tcp_probe_interval tcp_mtu_check_reprobe(tcp_write_xmit)
+int sysctl_tcp_keepalive_time
+int sysctl_tcp_keepalive_intvl
+u8 sysctl_tcp_keepalive_probes
+u8 sysctl_tcp_syn_retries
+u8 sysctl_tcp_synack_retries
+u8 sysctl_tcp_syncookies generated_on_syn
+u8 sysctl_tcp_migrate_req reuseport
+u8 sysctl_tcp_comp_sack_nr __tcp_ack_snd_check
+int sysctl_tcp_reordering read_mostly tcp_may_raise_cwnd/tcp_cong_control
+u8 sysctl_tcp_retries1
+u8 sysctl_tcp_retries2
+u8 sysctl_tcp_orphan_retries
+u8 sysctl_tcp_tw_reuse timewait_sock_ops
+unsigned_int sysctl_tcp_tw_reuse_delay timewait_sock_ops
+int sysctl_tcp_fin_timeout TCP_LAST_ACK/tcp_rcv_state_process
+unsigned_int sysctl_tcp_notsent_lowat read_mostly tcp_notsent_lowat/tcp_stream_memory_free
+u8 sysctl_tcp_sack tcp_syn_options
+u8 sysctl_tcp_window_scaling tcp_syn_options,tcp_parse_options
+u8 sysctl_tcp_timestamps
+u8 sysctl_tcp_early_retrans read_mostly tcp_schedule_loss_probe(tcp_write_xmit)
+u32 sysctl_tcp_rto_max_ms
+u8 sysctl_tcp_recovery tcp_fastretrans_alert
+u8 sysctl_tcp_thin_linear_timeouts tcp_retrans_timer(on_thin_streams)
+u8 sysctl_tcp_slow_start_after_idle unlikely(tcp_cwnd_validate-network-not-starved)
+u8 sysctl_tcp_retrans_collapse
+u8 sysctl_tcp_stdurg unlikely(tcp_check_urg)
+u8 sysctl_tcp_rfc1337
+u8 sysctl_tcp_abort_on_overflow
+u8 sysctl_tcp_fack
+int sysctl_tcp_max_reordering tcp_check_sack_reordering
+int sysctl_tcp_adv_win_scale tcp_init_buffer_space
+u8 sysctl_tcp_dsack partial_packet_or_retrans_in_tcp_data_queue
+u8 sysctl_tcp_app_win tcp_win_from_space
+u8 sysctl_tcp_frto tcp_enter_loss
+u8 sysctl_tcp_nometrics_save TCP_LAST_ACK/tcp_update_metrics
+u8 sysctl_tcp_no_ssthresh_metrics_save TCP_LAST_ACK/tcp_(update/init)_metrics
+u8 sysctl_tcp_moderate_rcvbuf read_mostly tcp_rcvbuf_grow()
+u32 sysctl_tcp_rcvbuf_low_rtt read_mostly tcp_rcvbuf_grow()
+u8 sysctl_tcp_tso_win_divisor read_mostly tcp_tso_should_defer(tcp_write_xmit)
+u8 sysctl_tcp_workaround_signed_windows tcp_select_window
+int sysctl_tcp_limit_output_bytes read_mostly tcp_small_queue_check(tcp_write_xmit)
+int sysctl_tcp_challenge_ack_limit
+int sysctl_tcp_min_rtt_wlen read_mostly tcp_ack_update_rtt
+u8 sysctl_tcp_min_tso_segs unlikely(icsk_ca_ops-written)
+u8 sysctl_tcp_tso_rtt_log read_mostly tcp_tso_autosize
+u8 sysctl_tcp_autocorking read_mostly tcp_push/tcp_should_autocork
+u8 sysctl_tcp_reflect_tos tcp_v(4/6)_send_synack
+int sysctl_tcp_invalid_ratelimit
+int sysctl_tcp_pacing_ss_ratio default_cong_cont(tcp_update_pacing_rate)
+int sysctl_tcp_pacing_ca_ratio default_cong_cont(tcp_update_pacing_rate)
+int sysctl_tcp_wmem[3] read_mostly tcp_wmem_schedule(sendmsg/sendpage)
+int sysctl_tcp_rmem[3] read_mostly __tcp_grow_window(tx),tcp_rcv_space_adjust(rx)
+unsigned_int sysctl_tcp_child_ehash_entries
+unsigned_long sysctl_tcp_comp_sack_delay_ns __tcp_ack_snd_check
+unsigned_long sysctl_tcp_comp_sack_slack_ns __tcp_ack_snd_check
+int sysctl_max_syn_backlog
+int sysctl_tcp_fastopen
+struct_tcp_congestion_ops tcp_congestion_control init_cc
+struct_tcp_fastopen_context tcp_fastopen_ctx
+unsigned_int sysctl_tcp_fastopen_blackhole_timeout
+atomic_t tfo_active_disable_times
+unsigned_long tfo_active_disable_stamp
+u32 tcp_challenge_timestamp
+u32 tcp_challenge_count
+u8 sysctl_tcp_plb_enabled
+u8 sysctl_tcp_plb_idle_rehash_rounds
+u8 sysctl_tcp_plb_rehash_rounds
+u8 sysctl_tcp_plb_suspend_rto_sec
+int sysctl_tcp_plb_cong_thresh
+int sysctl_udp_wmem_min
+int sysctl_udp_rmem_min
+u8 sysctl_fib_notify_on_flag_change
+u8 sysctl_udp_l3mdev_accept
+u8 sysctl_igmp_llm_reports
+int sysctl_igmp_max_memberships
+int sysctl_igmp_max_msf
+int sysctl_igmp_qrv
+struct_ping_group_range ping_group_range
+atomic_t dev_addr_genid
+unsigned_int sysctl_udp_child_hash_entries
+unsigned_long* sysctl_local_reserved_ports
+int sysctl_ip_prot_sock
+struct_mr_table* mrt
+struct_list_head mr_tables
+struct_fib_rules_ops* mr_rules_ops
+u32 sysctl_fib_multipath_hash_fields
+u8 sysctl_fib_multipath_use_neigh
+u8 sysctl_fib_multipath_hash_policy
+struct_fib_notifier_ops* notifier_ops
+unsigned_int fib_seq
+struct_fib_notifier_ops* ipmr_notifier_ops
+unsigned_int ipmr_seq
+atomic_t rt_genid
+siphash_key_t ip_id_key
+=============================== ============================================ =================== =================== =================================================