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1.. SPDX-License-Identifier: GPL-2.02.. Copyright (C) 2023 Google LLC3 4=========================================5tcp_sock struct fast path usage breakdown6=========================================7 8Type Name fastpath_tx_access fastpath_rx_access Comments9..struct ..tcp_sock 10struct_inet_connection_sock inet_conn 11u16 tcp_header_len read_mostly read_mostly tcp_bound_to_half_wnd,tcp_current_mss(tx);tcp_rcv_established(rx)12u16 gso_segs read_mostly - tcp_xmit_size_goal13__be32 pred_flags read_write read_mostly tcp_select_window(tx);tcp_rcv_established(rx)14u64 bytes_received - read_write tcp_rcv_nxt_update(rx)15u32 segs_in - read_write tcp_v6_rcv(rx)16u32 data_segs_in - read_write tcp_v6_rcv(rx)17u32 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)18u32 copied_seq - read_mostly tcp_cleanup_rbuf,tcp_rcv_space_adjust,tcp_inq_hint19u32 rcv_wup - read_write __tcp_cleanup_rbuf,tcp_receive_window,tcp_receive_established20u32 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)21u32 segs_out read_write - __tcp_transmit_skb22u32 data_segs_out read_write - __tcp_transmit_skb,tcp_update_skb_after_send23u64 bytes_sent read_write - __tcp_transmit_skb24u64 bytes_acked - read_write tcp_snd_una_update/tcp_ack25u32 dsack_dups 26u32 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)27u32 snd_sml read_write - tcp_minshall_check,tcp_minshall_update28u32 rcv_tstamp - read_mostly tcp_ack29u32 lsndtime read_write - tcp_slow_start_after_idle_check,tcp_event_data_sent30u32 last_oow_ack_time 31u32 compressed_ack_rcv_nxt 32u32 tsoffset read_mostly read_mostly tcp_established_options(tx);tcp_fast_parse_options(rx)33struct_list_head tsq_node - - 34struct_list_head tsorted_sent_queue read_write - tcp_update_skb_after_send35u32 snd_wl1 - read_mostly tcp_may_update_window36u32 snd_wnd read_mostly read_mostly tcp_wnd_end,tcp_tso_should_defer(tx);tcp_fast_path_on(rx)37u32 max_window read_mostly - tcp_bound_to_half_wnd,forced_push38u32 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)39u32 window_clamp read_mostly read_write tcp_rcv_space_adjust,__tcp_select_window40u32 rcv_ssthresh read_mostly - __tcp_select_window41u8 scaling_ratio read_mostly read_mostly tcp_win_from_space42struct tcp_rack 43u16 advmss - read_mostly tcp_rcv_space_adjust44u8 compressed_ack 45u8:2 dup_ack_counter 46u8:1 tlp_retrans 47u8:1 tcp_usec_ts read_mostly read_mostly48u32 chrono_start read_write - tcp_chrono_start/stop(tcp_write_xmit,tcp_cwnd_validate,tcp_send_syn_data)49u32[3] chrono_stat read_write - tcp_chrono_start/stop(tcp_write_xmit,tcp_cwnd_validate,tcp_send_syn_data)50u8:2 chrono_type read_write - tcp_chrono_start/stop(tcp_write_xmit,tcp_cwnd_validate,tcp_send_syn_data)51u8:1 rate_app_limited - read_write tcp_rate_gen52u8:1 fastopen_connect 53u8:1 fastopen_no_cookie 54u8:1 is_sack_reneg - read_mostly tcp_skb_entail,tcp_ack55u8:2 fastopen_client_fail 56u8:4 nonagle read_write - tcp_skb_entail,tcp_push_pending_frames57u8:1 thin_lto 58u8:1 recvmsg_inq 59u8:1 repair read_mostly - tcp_write_xmit60u8:1 frto 61u8 repair_queue - - 62u8:2 save_syn 63u8:1 syn_data 64u8:1 syn_fastopen 65u8:1 syn_fastopen_exp 66u8:1 syn_fastopen_ch 67u8:1 syn_data_acked 68u8:1 is_cwnd_limited read_mostly - tcp_cwnd_validate,tcp_is_cwnd_limited69u32 tlp_high_seq - read_mostly tcp_ack70u32 tcp_tx_delay 71u64 tcp_wstamp_ns read_write - tcp_pacing_check,tcp_tso_should_defer,tcp_update_skb_after_send72u64 tcp_clock_cache read_write read_write tcp_mstamp_refresh(tcp_write_xmit/tcp_rcv_space_adjust),__tcp_transmit_skb,tcp_tso_should_defer;timer73u64 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);timer74u32 srtt_us read_mostly read_write tcp_tso_should_defer(tx);tcp_update_pacing_rate,__tcp_set_rto,tcp_rtt_estimator(rx)75u32 mdev_us read_write - tcp_rtt_estimator76u32 mdev_max_us 77u32 rttvar_us - read_mostly __tcp_set_rto78u32 rtt_seq read_write tcp_rtt_estimator79struct_minmax rtt_min - read_mostly tcp_min_rtt/tcp_rate_gen,tcp_min_rtttcp_update_rtt_min80u32 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)81u32 retrans_out - read_mostly tcp_packets_in_flight,tcp_rate_check_app_limited82u32 max_packets_out - read_write tcp_cwnd_validate83u32 cwnd_usage_seq - read_write tcp_cwnd_validate84u16 urg_data - read_mostly tcp_fast_path_check85u8 ecn_flags read_write - tcp_ecn_send86u8 keepalive_probes 87u32 reordering read_mostly - tcp_sndbuf_expand88u32 reord_seen 89u32 snd_up read_write read_mostly tcp_mark_urg,tcp_urg_mode,__tcp_transmit_skb(tx);tcp_clean_rtx_queue(rx)90struct_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)91u32 snd_ssthresh - read_mostly tcp_update_pacing_rate92u32 snd_cwnd read_mostly read_mostly tcp_snd_cwnd,tcp_rate_check_app_limited,tcp_tso_should_defer(tx);tcp_update_pacing_rate93u32 snd_cwnd_cnt 94u32 snd_cwnd_clamp 95u32 snd_cwnd_used 96u32 snd_cwnd_stamp 97u32 prior_cwnd 98u32 prr_delivered 99u32 prr_out read_mostly read_mostly tcp_rate_skb_sent,tcp_newly_delivered(tx);tcp_ack,tcp_rate_gen,tcp_clean_rtx_queue(rx)100u32 delivered read_mostly read_write tcp_rate_skb_sent, tcp_newly_delivered(tx);tcp_ack, tcp_rate_gen, tcp_clean_rtx_queue (rx)101u32 delivered_ce read_mostly read_write tcp_rate_skb_sent(tx);tcp_rate_gen(rx)102u32 lost - read_mostly tcp_ack103u32 app_limited read_write read_mostly tcp_rate_check_app_limited,tcp_rate_skb_sent(tx);tcp_rate_gen(rx)104u64 first_tx_mstamp read_write - tcp_rate_skb_sent105u64 delivered_mstamp read_write - tcp_rate_skb_sent106u32 rate_delivered - read_mostly tcp_rate_gen107u32 rate_interval_us - read_mostly rate_delivered,rate_app_limited108u32 rcv_wnd read_write read_mostly tcp_select_window,tcp_receive_window,tcp_fast_path_check109u32 write_seq read_write - tcp_rate_check_app_limited,tcp_write_queue_empty,tcp_skb_entail,forced_push,tcp_mark_push110u32 notsent_lowat read_mostly - tcp_stream_memory_free111u32 pushed_seq read_write - tcp_mark_push,forced_push112u32 lost_out read_mostly read_mostly tcp_left_out(tx);tcp_packets_in_flight(tx/rx);tcp_rate_check_app_limited(rx)113u32 sacked_out read_mostly read_mostly tcp_left_out(tx);tcp_packets_in_flight(tx/rx);tcp_clean_rtx_queue(rx)114struct_hrtimer pacing_timer 115struct_hrtimer compressed_ack_timer 116struct_sk_buff* lost_skb_hint read_mostly tcp_clean_rtx_queue117struct_sk_buff* retransmit_skb_hint read_mostly - tcp_clean_rtx_queue118struct_rb_root out_of_order_queue - read_mostly tcp_data_queue,tcp_fast_path_check119struct_sk_buff* ooo_last_skb 120struct_tcp_sack_block[1] duplicate_sack 121struct_tcp_sack_block[4] selective_acks 122struct_tcp_sack_block[4] recv_sack_cache 123struct_sk_buff* highest_sack read_write - tcp_event_new_data_sent124int lost_cnt_hint 125u32 prior_ssthresh 126u32 high_seq 127u32 retrans_stamp 128u32 undo_marker 129int undo_retrans 130u64 bytes_retrans 131u32 total_retrans 132u32 rto_stamp 133u16 total_rto 134u16 total_rto_recoveries 135u32 total_rto_time 136u32 urg_seq - - 137unsigned_int keepalive_time 138unsigned_int keepalive_intvl 139int linger2 140u8 bpf_sock_ops_cb_flags 141u8:1 bpf_chg_cc_inprogress 142u16 timeout_rehash 143u32 rcv_ooopack 144u32 rcv_rtt_last_tsecr 145struct rcv_rtt_est - read_write tcp_rcv_space_adjust,tcp_rcv_established146struct rcvq_space - read_write tcp_rcv_space_adjust147struct mtu_probe 148u32 plb_rehash 149u32 mtu_info 150bool is_mptcp 151bool smc_hs_congested 152bool syn_smc 153struct_tcp_sock_af_ops* af_specific 154struct_tcp_md5sig_info* md5sig_info 155struct_tcp_fastopen_request* fastopen_req 156struct_request_sock* fastopen_rsk 157struct_saved_syn* saved_syn