.. SPDX-License-Identifier: GPL-2.0
.. Copyright (C) 2023 Google LLC
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tcp_sock struct fast path usage breakdown
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Type Name fastpath_tx_access fastpath_rx_access Comments
..struct ..tcp_sock
struct_inet_connection_sock inet_conn
u16 tcp_header_len read_mostly read_mostly tcp_bound_to_half_wnd,tcp_current_mss(tx);tcp_rcv_established(rx)
u16 gso_segs read_mostly - tcp_xmit_size_goal
__be32 pred_flags read_write read_mostly tcp_select_window(tx);tcp_rcv_established(rx)
u64 bytes_received - read_write tcp_rcv_nxt_update(rx)
u32 segs_in - read_write tcp_v6_rcv(rx)
u32 data_segs_in - read_write tcp_v6_rcv(rx)
u32 rcv_nxt read_mostly read_write tcp_cleanup_rbuf,tcp_send_ack,tcp_inq_hint,tcp_transmit_skb,tcp_receive_window(tx);tcp_v6_do_rcv,tcp_rcv_established,tcp_data_queue,tcp_receive_window,tcp_rcv_nxt_update(write)(rx)
u32 copied_seq - read_mostly tcp_cleanup_rbuf,tcp_rcv_space_adjust,tcp_inq_hint
u32 rcv_wup - read_write __tcp_cleanup_rbuf,tcp_receive_window,tcp_receive_established
u32 snd_nxt read_write read_mostly tcp_rate_check_app_limited,__tcp_transmit_skb,tcp_event_new_data_sent(write)(tx);tcp_rcv_established,tcp_ack,tcp_clean_rtx_queue(rx)
u32 segs_out read_write - __tcp_transmit_skb
u32 data_segs_out read_write - __tcp_transmit_skb,tcp_update_skb_after_send
u64 bytes_sent read_write - __tcp_transmit_skb
u64 bytes_acked - read_write tcp_snd_una_update/tcp_ack
u32 dsack_dups
u32 snd_una read_mostly read_write tcp_wnd_end,tcp_urg_mode,tcp_minshall_check,tcp_cwnd_validate(tx);tcp_ack,tcp_may_update_window,tcp_clean_rtx_queue(write),tcp_ack_tstamp(rx)
u32 snd_sml read_write - tcp_minshall_check,tcp_minshall_update
u32 rcv_tstamp - read_mostly tcp_ack
u32 lsndtime read_write - tcp_slow_start_after_idle_check,tcp_event_data_sent
u32 last_oow_ack_time
u32 compressed_ack_rcv_nxt
u32 tsoffset read_mostly read_mostly tcp_established_options(tx);tcp_fast_parse_options(rx)
struct_list_head tsq_node - -
struct_list_head tsorted_sent_queue read_write - tcp_update_skb_after_send
u32 snd_wl1 - read_mostly tcp_may_update_window
u32 snd_wnd read_mostly read_mostly tcp_wnd_end,tcp_tso_should_defer(tx);tcp_fast_path_on(rx)
u32 max_window read_mostly - tcp_bound_to_half_wnd,forced_push
u32 mss_cache read_mostly read_mostly tcp_rate_check_app_limited,tcp_current_mss,tcp_sync_mss,tcp_sndbuf_expand,tcp_tso_should_defer(tx);tcp_update_pacing_rate,tcp_clean_rtx_queue(rx)
u32 window_clamp read_mostly read_write tcp_rcv_space_adjust,__tcp_select_window
u32 rcv_ssthresh read_mostly - __tcp_select_window
u8 scaling_ratio read_mostly read_mostly tcp_win_from_space
struct tcp_rack
u16 advmss - read_mostly tcp_rcv_space_adjust
u8 compressed_ack
u8:2 dup_ack_counter
u8:1 tlp_retrans
u8:1 tcp_usec_ts read_mostly read_mostly
u32 chrono_start read_write - tcp_chrono_start/stop(tcp_write_xmit,tcp_cwnd_validate,tcp_send_syn_data)
u32[3] chrono_stat read_write - tcp_chrono_start/stop(tcp_write_xmit,tcp_cwnd_validate,tcp_send_syn_data)
u8:2 chrono_type read_write - tcp_chrono_start/stop(tcp_write_xmit,tcp_cwnd_validate,tcp_send_syn_data)
u8:1 rate_app_limited - read_write tcp_rate_gen
u8:1 fastopen_connect
u8:1 fastopen_no_cookie
u8:1 is_sack_reneg - read_mostly tcp_skb_entail,tcp_ack
u8:2 fastopen_client_fail
u8:4 nonagle read_write - tcp_skb_entail,tcp_push_pending_frames
u8:1 thin_lto
u8:1 recvmsg_inq
u8:1 repair read_mostly - tcp_write_xmit
u8:1 frto
u8 repair_queue - -
u8:2 save_syn
u8:1 syn_data
u8:1 syn_fastopen
u8:1 syn_fastopen_exp
u8:1 syn_fastopen_ch
u8:1 syn_data_acked
u8:1 is_cwnd_limited read_mostly - tcp_cwnd_validate,tcp_is_cwnd_limited
u32 tlp_high_seq - read_mostly tcp_ack
u32 tcp_tx_delay
u64 tcp_wstamp_ns read_write - tcp_pacing_check,tcp_tso_should_defer,tcp_update_skb_after_send
u64 tcp_clock_cache read_write read_write tcp_mstamp_refresh(tcp_write_xmit/tcp_rcv_space_adjust),__tcp_transmit_skb,tcp_tso_should_defer;timer
u64 tcp_mstamp read_write read_write tcp_mstamp_refresh(tcp_write_xmit/tcp_rcv_space_adjust)(tx);tcp_rcv_space_adjust,tcp_rate_gen,tcp_clean_rtx_queue,tcp_ack_update_rtt/tcp_time_stamp(rx);timer
u32 srtt_us read_mostly read_write tcp_tso_should_defer(tx);tcp_update_pacing_rate,__tcp_set_rto,tcp_rtt_estimator(rx)
u32 mdev_us read_write - tcp_rtt_estimator
u32 mdev_max_us
u32 rttvar_us - read_mostly __tcp_set_rto
u32 rtt_seq read_write tcp_rtt_estimator
struct_minmax rtt_min - read_mostly tcp_min_rtt/tcp_rate_gen,tcp_min_rtttcp_update_rtt_min
u32 packets_out read_write read_write tcp_packets_in_flight(tx/rx);tcp_slow_start_after_idle_check,tcp_nagle_check,tcp_rate_skb_sent,tcp_event_new_data_sent,tcp_cwnd_validate,tcp_write_xmit(tx);tcp_ack,tcp_clean_rtx_queue,tcp_update_pacing_rate(rx)
u32 retrans_out - read_mostly tcp_packets_in_flight,tcp_rate_check_app_limited
u32 max_packets_out - read_write tcp_cwnd_validate
u32 cwnd_usage_seq - read_write tcp_cwnd_validate
u16 urg_data - read_mostly tcp_fast_path_check
u8 ecn_flags read_write - tcp_ecn_send
u8 keepalive_probes
u32 reordering read_mostly - tcp_sndbuf_expand
u32 reord_seen
u32 snd_up read_write read_mostly tcp_mark_urg,tcp_urg_mode,__tcp_transmit_skb(tx);tcp_clean_rtx_queue(rx)
struct_tcp_options_received rx_opt read_mostly read_write tcp_established_options(tx);tcp_fast_path_on,tcp_ack_update_window,tcp_is_sack,tcp_data_queue,tcp_rcv_established,tcp_ack_update_rtt(rx)
u32 snd_ssthresh - read_mostly tcp_update_pacing_rate
u32 snd_cwnd read_mostly read_mostly tcp_snd_cwnd,tcp_rate_check_app_limited,tcp_tso_should_defer(tx);tcp_update_pacing_rate
u32 snd_cwnd_cnt
u32 snd_cwnd_clamp
u32 snd_cwnd_used
u32 snd_cwnd_stamp
u32 prior_cwnd
u32 prr_delivered
u32 prr_out read_mostly read_mostly tcp_rate_skb_sent,tcp_newly_delivered(tx);tcp_ack,tcp_rate_gen,tcp_clean_rtx_queue(rx)
u32 delivered read_mostly read_write tcp_rate_skb_sent, tcp_newly_delivered(tx);tcp_ack, tcp_rate_gen, tcp_clean_rtx_queue (rx)
u32 delivered_ce read_mostly read_write tcp_rate_skb_sent(tx);tcp_rate_gen(rx)
u32 lost - read_mostly tcp_ack
u32 app_limited read_write read_mostly tcp_rate_check_app_limited,tcp_rate_skb_sent(tx);tcp_rate_gen(rx)
u64 first_tx_mstamp read_write - tcp_rate_skb_sent
u64 delivered_mstamp read_write - tcp_rate_skb_sent
u32 rate_delivered - read_mostly tcp_rate_gen
u32 rate_interval_us - read_mostly rate_delivered,rate_app_limited
u32 rcv_wnd read_write read_mostly tcp_select_window,tcp_receive_window,tcp_fast_path_check
u32 write_seq read_write - tcp_rate_check_app_limited,tcp_write_queue_empty,tcp_skb_entail,forced_push,tcp_mark_push
u32 notsent_lowat read_mostly - tcp_stream_memory_free
u32 pushed_seq read_write - tcp_mark_push,forced_push
u32 lost_out read_mostly read_mostly tcp_left_out(tx);tcp_packets_in_flight(tx/rx);tcp_rate_check_app_limited(rx)
u32 sacked_out read_mostly read_mostly tcp_left_out(tx);tcp_packets_in_flight(tx/rx);tcp_clean_rtx_queue(rx)
struct_hrtimer pacing_timer
struct_hrtimer compressed_ack_timer
struct_sk_buff* lost_skb_hint read_mostly tcp_clean_rtx_queue
struct_sk_buff* retransmit_skb_hint read_mostly - tcp_clean_rtx_queue
struct_rb_root out_of_order_queue - read_mostly tcp_data_queue,tcp_fast_path_check
struct_sk_buff* ooo_last_skb
struct_tcp_sack_block[1] duplicate_sack
struct_tcp_sack_block[4] selective_acks
struct_tcp_sack_block[4] recv_sack_cache
struct_sk_buff* highest_sack read_write - tcp_event_new_data_sent
int lost_cnt_hint
u32 prior_ssthresh
u32 high_seq
u32 retrans_stamp
u32 undo_marker
int undo_retrans
u64 bytes_retrans
u32 total_retrans
u32 rto_stamp
u16 total_rto
u16 total_rto_recoveries
u32 total_rto_time
u32 urg_seq - -
unsigned_int keepalive_time
unsigned_int keepalive_intvl
int linger2
u8 bpf_sock_ops_cb_flags
u8:1 bpf_chg_cc_inprogress
u16 timeout_rehash
u32 rcv_ooopack
u32 rcv_rtt_last_tsecr
struct rcv_rtt_est - read_write tcp_rcv_space_adjust,tcp_rcv_established
struct rcvq_space - read_write tcp_rcv_space_adjust
struct mtu_probe
u32 plb_rehash
u32 mtu_info
bool is_mptcp
bool smc_hs_congested
bool syn_smc
struct_tcp_sock_af_ops* af_specific
struct_tcp_md5sig_info* md5sig_info
struct_tcp_fastopen_request* fastopen_req
struct_request_sock* fastopen_rsk
struct_saved_syn* saved_syn
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