.. SPDX-License-Identifier: GPL-2.0 .. Copyright (C) 2023 Google LLC ========================================= tcp_sock struct fast path usage breakdown ========================================= ============================= ======================= =================== =================== ================================================================================================================================================================================================================== Type Name fastpath_tx_access fastpath_rx_access Comments ============================= ======================= =================== =================== ================================================================================================================================================================================================================== 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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