X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Ftcp%2Ftcp.h;h=e7b53b8ec427f5f901b9c88ba44e4505290772d4;hb=aa3886993c13d71d93ef01dc73b79985d6ec997f;hp=68750ce373f2c872e655d3f0cfa91d9ebd0b48b6;hpb=d4c49be5e20406220cf89083c9df86c3c0761a81;p=vpp.git diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h index 68750ce373f..e7b53b8ec42 100644 --- a/src/vnet/tcp/tcp.h +++ b/src/vnet/tcp/tcp.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2016 Cisco and/or its affiliates. + * Copyright (c) 2016-2019 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: @@ -31,10 +31,10 @@ #define TCP_FIB_RECHECK_PERIOD 1 * THZ /**< Recheck every 1s */ #define TCP_MAX_OPTION_SPACE 40 #define TCP_CC_DATA_SZ 24 +#define TCP_MAX_GSO_SZ 65536 +#define TCP_RXT_MAX_BURST 10 #define TCP_DUPACK_THRESHOLD 3 -#define TCP_MAX_RX_FIFO_SIZE 32 << 20 -#define TCP_MIN_RX_FIFO_SIZE 4 << 10 #define TCP_IW_N_SEGMENTS 10 #define TCP_ALWAYS_ACK 1 /**< On/off delayed acks */ #define TCP_USE_SACKS 1 /**< Disable only for testing */ @@ -71,11 +71,8 @@ format_function_t format_tcp_rcv_sacks; _(RETRANSMIT, "RETRANSMIT") \ _(DELACK, "DELAYED ACK") \ _(PERSIST, "PERSIST") \ - _(KEEP, "KEEP") \ _(WAITCLOSE, "WAIT CLOSE") \ _(RETRANSMIT_SYN, "RETRANSMIT SYN") \ - _(ESTABLISH, "ESTABLISH") \ - _(ESTABLISH_AO, "ESTABLISH_AO") \ typedef enum _tcp_timers { @@ -85,50 +82,61 @@ typedef enum _tcp_timers TCP_N_TIMERS } tcp_timers_e; -typedef void (timer_expiration_handler) (u32 index); - -extern timer_expiration_handler tcp_timer_delack_handler; -extern timer_expiration_handler tcp_timer_retransmit_handler; -extern timer_expiration_handler tcp_timer_persist_handler; -extern timer_expiration_handler tcp_timer_retransmit_syn_handler; - #define TCP_TIMER_HANDLE_INVALID ((u32) ~0) -/* Timer delays as multiples of 100ms */ -#define TCP_TO_TIMER_TICK TCP_TICK*10 /* Period for converting from TCP - * ticks to timer units */ -#define TCP_DELACK_TIME 1 /* 0.1s */ -#define TCP_ESTABLISH_TIME 750 /* 75s */ -#define TCP_SYN_RCVD_TIME 600 /* 60s */ -#define TCP_2MSL_TIME 300 /* 30s */ -#define TCP_CLOSEWAIT_TIME 20 /* 2s */ -#define TCP_TIMEWAIT_TIME 100 /* 10s */ -#define TCP_FINWAIT1_TIME 600 /* 60s */ -#define TCP_CLEANUP_TIME 1 /* 0.1s */ -#define TCP_TIMER_PERSIST_MIN 2 /* 0.2s */ +#define TCP_TIMER_TICK 0.1 /**< Timer tick in seconds */ +#define TCP_TO_TIMER_TICK TCP_TICK*10 /**< Factor for converting + ticks to timer ticks */ #define TCP_RTO_MAX 60 * THZ /* Min max RTO (60s) as per RFC6298 */ #define TCP_RTO_MIN 0.2 * THZ /* Min RTO (200ms) - lower than standard */ #define TCP_RTT_MAX 30 * THZ /* 30s (probably too much) */ #define TCP_RTO_SYN_RETRIES 3 /* SYN retries without doubling RTO */ #define TCP_RTO_INIT 1 * THZ /* Initial retransmit timer */ +#define TCP_RTO_BOFF_MAX 8 /* Max number of retries before reset */ +#define TCP_ESTABLISH_TIME (60 * THZ) /* Connection establish timeout */ + +/** Connection configuration flags */ +#define foreach_tcp_cfg_flag \ + _(RATE_SAMPLE, "Rate sampling") \ + _(NO_CSUM_OFFLOAD, "No csum offload") \ + _(NO_TSO, "TSO off") \ + _(TSO, "TSO") \ + _(NO_ENDPOINT,"No endpoint") \ + +typedef enum tcp_cfg_flag_bits_ +{ +#define _(sym, str) TCP_CFG_F_##sym##_BIT, + foreach_tcp_cfg_flag +#undef _ + TCP_CFG_N_FLAG_BITS +} tcp_cfg_flag_bits_e; + +typedef enum tcp_cfg_flag_ +{ +#define _(sym, str) TCP_CFG_F_##sym = 1 << TCP_CFG_F_##sym##_BIT, + foreach_tcp_cfg_flag +#undef _ + TCP_CFG_N_FLAGS +} tcp_cfg_flags_e; /** TCP connection flags */ #define foreach_tcp_connection_flag \ _(SNDACK, "Send ACK") \ _(FINSNT, "FIN sent") \ - _(SENT_RCV_WND0, "Sent 0 rcv_wnd") \ _(RECOVERY, "Recovery") \ _(FAST_RECOVERY, "Fast Recovery") \ _(DCNT_PENDING, "Disconnect pending") \ _(HALF_OPEN_DONE, "Half-open completed") \ _(FINPNDG, "FIN pending") \ - _(FRXT_PENDING, "Fast-retransmit pending") \ - _(FRXT_FIRST, "Fast-retransmit first again") \ - _(DEQ_PENDING, "Pending dequeue acked") \ + _(RXT_PENDING, "Retransmit pending") \ + _(FRXT_FIRST, "Retransmit first") \ + _(DEQ_PENDING, "Dequeue pending ") \ _(PSH_PENDING, "PSH pending") \ + _(FINRCVD, "FIN received") \ + _(ZERO_RWND_SENT, "Zero RWND sent") \ -typedef enum _tcp_connection_flag_bits +typedef enum tcp_connection_flag_bits_ { #define _(sym, str) TCP_CONN_##sym##_BIT, foreach_tcp_connection_flag @@ -136,7 +144,7 @@ typedef enum _tcp_connection_flag_bits TCP_CONN_N_FLAG_BITS } tcp_connection_flag_bits_e; -typedef enum _tcp_connection_flag +typedef enum tcp_connection_flag_ { #define _(sym, str) TCP_CONN_##sym = 1 << TCP_CONN_##sym##_BIT, foreach_tcp_connection_flag @@ -144,26 +152,6 @@ typedef enum _tcp_connection_flag TCP_CONN_N_FLAGS } tcp_connection_flags_e; -/** TCP buffer flags */ -#define foreach_tcp_buf_flag \ - _ (ACK) /**< Sending ACK. */ \ - _ (DUPACK) /**< Sending DUPACK. */ \ - -enum -{ -#define _(f) TCP_BUF_BIT_##f, - foreach_tcp_buf_flag -#undef _ - TCP_N_BUF_BITS, -}; - -enum -{ -#define _(f) TCP_BUF_FLAG_##f = 1 << TCP_BUF_BIT_##f, - foreach_tcp_buf_flag -#undef _ -}; - #define TCP_SCOREBOARD_TRACE (0) #define TCP_MAX_SACK_BLOCKS 256 /**< Max number of SACK blocks stored */ #define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0) @@ -193,13 +181,15 @@ typedef struct _sack_scoreboard u32 tail; /**< Index of last entry */ u32 sacked_bytes; /**< Number of bytes sacked in sb */ u32 last_sacked_bytes; /**< Number of bytes last sacked */ - u32 last_bytes_delivered; /**< Number of sack bytes delivered */ - u32 snd_una_adv; /**< Bytes to add to snd_una */ + u32 last_bytes_delivered; /**< Sack bytes delivered to app */ + u32 rxt_sacked; /**< Rxt bytes last delivered */ u32 high_sacked; /**< Highest byte sacked (fack) */ u32 high_rxt; /**< Highest retransmitted sequence */ u32 rescue_rxt; /**< Rescue sequence number */ u32 lost_bytes; /**< Bytes lost as per RFC6675 */ + u32 last_lost_bytes; /**< Number of bytes last lost */ u32 cur_rxt_hole; /**< Retransmitting from this hole */ + u8 is_reneging; #if TCP_SCOREBOARD_TRACE scoreboard_trace_elt_t *trace; @@ -246,14 +236,63 @@ sack_scoreboard_hole_t *scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole); sack_scoreboard_hole_t *scoreboard_first_hole (sack_scoreboard_t * sb); sack_scoreboard_hole_t *scoreboard_last_hole (sack_scoreboard_t * sb); + void scoreboard_clear (sack_scoreboard_t * sb); +void scoreboard_clear_reneging (sack_scoreboard_t * sb, u32 start, u32 end); void scoreboard_init (sack_scoreboard_t * sb); +void scoreboard_init_rxt (sack_scoreboard_t * sb, u32 snd_una); u8 *format_tcp_scoreboard (u8 * s, va_list * args); +#define TCP_BTS_INVALID_INDEX ((u32)~0) + +typedef enum tcp_bts_flags_ +{ + TCP_BTS_IS_RXT = 1, + TCP_BTS_IS_APP_LIMITED = 1 << 1, + TCP_BTS_IS_SACKED = 1 << 2, + TCP_BTS_IS_RXT_LOST = 1 << 3, +} __clib_packed tcp_bts_flags_t; + +typedef struct tcp_bt_sample_ +{ + u32 next; /**< Next sample index in list */ + u32 prev; /**< Previous sample index in list */ + u32 min_seq; /**< Min seq number in sample */ + u32 max_seq; /**< Max seq number. Set for rxt samples */ + u64 delivered; /**< Total delivered bytes for sample */ + f64 delivered_time; /**< Delivered time when sample taken */ + f64 tx_time; /**< Transmit time for the burst */ + f64 first_tx_time; /**< Connection first tx time at tx */ + tcp_bts_flags_t flags; /**< Sample flag */ +} tcp_bt_sample_t; + +typedef struct tcp_rate_sample_ +{ + u64 prior_delivered; /**< Delivered of sample used for rate, i.e., + total bytes delivered at prior_time */ + f64 prior_time; /**< Delivered time of sample used for rate */ + f64 interval_time; /**< Time to ack the bytes delivered */ + f64 rtt_time; /**< RTT for sample */ + u32 delivered; /**< Bytes delivered in interval_time */ + u32 acked_and_sacked; /**< Bytes acked + sacked now */ + u32 lost; /**< Bytes lost now */ + tcp_bts_flags_t flags; /**< Rate sample flags from bt sample */ +} tcp_rate_sample_t; + +typedef struct tcp_byte_tracker_ +{ + tcp_bt_sample_t *samples; /**< Pool of samples */ + rb_tree_t sample_lookup; /**< Rbtree for sample lookup by min_seq */ + u32 head; /**< Head of samples linked list */ + u32 tail; /**< Tail of samples linked list */ + u32 last_ooo; /**< Cached last ooo sample */ +} tcp_byte_tracker_t; + typedef enum _tcp_cc_algorithm_type { TCP_CC_NEWRENO, TCP_CC_CUBIC, + TCP_CC_LAST = TCP_CC_CUBIC } tcp_cc_algorithm_type_e; typedef struct _tcp_cc_algorithm tcp_cc_algorithm_t; @@ -265,16 +304,36 @@ typedef enum _tcp_cc_ack_t TCP_CC_PARTIALACK } tcp_cc_ack_t; +typedef enum tcp_cc_event_ +{ + TCP_CC_EVT_START_TX, +} tcp_cc_event_t; + +/* + * As per RFC4898 tcpEStatsStackSoftErrors + */ +typedef struct tcp_errors_ +{ + u32 below_data_wnd; /**< All data in seg is below snd_una */ + u32 above_data_wnd; /**< Some data in segment is above snd_wnd */ + u32 below_ack_wnd; /**< Acks for data below snd_una */ + u32 above_ack_wnd; /**< Acks for data not sent */ +} tcp_errors_t; + typedef struct _tcp_connection { CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); transport_connection_t connection; /**< Common transport data. First! */ u8 state; /**< TCP state as per tcp_state_t */ + u8 cfg_flags; /**< Connection configuration flags */ u16 flags; /**< Connection flags (see tcp_conn_flags_e) */ u32 timers[TCP_N_TIMERS]; /**< Timer handles into timer wheel */ - /* TODO RFC4898 */ + u64 segs_in; /** RFC4022/4898 tcpHCInSegs/tcpEStatsPerfSegsIn */ + u64 bytes_in; /** RFC4898 tcpEStatsPerfHCDataOctetsIn */ + u64 segs_out; /** RFC4898 tcpEStatsPerfSegsOut */ + u64 bytes_out; /** RFC4898 tcpEStatsPerfHCDataOctetsOut */ /** Send sequence variables RFC793 */ u32 snd_una; /**< oldest unacknowledged sequence number */ @@ -285,6 +344,9 @@ typedef struct _tcp_connection u32 snd_nxt; /**< next seq number to be sent */ u16 snd_mss; /**< Effective send max seg (data) size */ + u64 data_segs_in; /** RFC4898 tcpEStatsPerfDataSegsIn */ + u64 data_segs_out; /** RFC4898 tcpEStatsPerfDataSegsOut */ + /** Receive sequence variables RFC793 */ u32 rcv_nxt; /**< next sequence number expected */ u32 rcv_wnd; /**< receive window we expect */ @@ -303,10 +365,14 @@ typedef struct _tcp_connection tcp_options_t rcv_opts; /**< Rx options for connection */ sack_block_t *snd_sacks; /**< Vector of SACKs to send. XXX Fixed size? */ + u8 snd_sack_pos; /**< Position in vec of first block to send */ + sack_block_t *snd_sacks_fl; /**< Vector for building new list */ sack_scoreboard_t sack_sb; /**< SACK "scoreboard" that tracks holes */ - u16 rcv_dupacks; /**< Number of DUPACKs received */ + u16 rcv_dupacks; /**< Number of recent DUPACKs received */ + u32 dupacks_in; /**< RFC4898 tcpEStatsStackDupAcksIn*/ u8 pending_dupacks; /**< Number of DUPACKs to be sent */ + u32 dupacks_out; /**< RFC4898 tcpEStatsPathDupAcksOut */ /* Congestion control */ u32 cwnd; /**< Congestion window */ @@ -316,13 +382,24 @@ typedef struct _tcp_connection u32 prev_cwnd; /**< ssthresh before congestion */ u32 bytes_acked; /**< Bytes acknowledged by current segment */ u32 burst_acked; /**< Bytes acknowledged in current burst */ - u32 snd_rxt_bytes; /**< Retransmitted bytes */ + u32 snd_rxt_bytes; /**< Retransmitted bytes during current cc event */ u32 snd_rxt_ts; /**< Timestamp when first packet is retransmitted */ + u32 prr_delivered; /**< RFC6937 bytes delivered during current event */ + u32 prr_start; /**< snd_una when prr starts */ + u32 rxt_delivered; /**< Rxt bytes delivered during current cc event */ + u32 rxt_head; /**< snd_una last time we re rxted the head */ u32 tsecr_last_ack; /**< Timestamp echoed to us in last healthy ACK */ u32 snd_congestion; /**< snd_una_max when congestion is detected */ + u32 tx_fifo_size; /**< Tx fifo size. Used to constrain cwnd */ tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */ u8 cc_data[TCP_CC_DATA_SZ]; /**< Congestion control algo private data */ + u32 fr_occurences; /**< fast-retransmit occurrences RFC4898 + tcpEStatsStackFastRetran */ + u32 tr_occurences; /**< timer-retransmit occurrences */ + u64 bytes_retrans; /**< RFC4898 tcpEStatsPerfOctetsRetrans */ + u64 segs_retrans; /**< RFC4898 tcpEStatsPerfSegsRetrans*/ + /* RTT and RTO */ u32 rto; /**< Retransmission timeout */ u32 rto_boff; /**< Index for RTO backoff */ @@ -332,13 +409,28 @@ typedef struct _tcp_connection f64 rtt_ts; /**< Timestamp for tracked ACK */ f64 mrtt_us; /**< High precision mrtt from tracked acks */ - u16 mss; /**< Our max seg size that includes options */ + u32 psh_seq; /**< Add psh header for seg that includes this */ + u32 next_node_index; /**< Can be used to control next node in output */ + u32 next_node_opaque; /**< Opaque to pass to next node */ u32 limited_transmit; /**< snd_nxt when limited transmit starts */ - u32 last_fib_check; /**< Last time we checked fib route for peer */ u32 sw_if_index; /**< Interface for the connection */ - u32 tx_fifo_size; /**< Tx fifo size. Used to constrain cwnd */ - u32 psh_seq; /**< Add psh header for seg that includes this */ + /* Delivery rate estimation */ + u64 delivered; /**< Total bytes delivered to peer */ + u64 app_limited; /**< Delivered when app-limited detected */ + f64 delivered_time; /**< Time last bytes were acked */ + f64 first_tx_time; /**< Send time for recently delivered/sent */ + tcp_byte_tracker_t *bt; /**< Tx byte tracker */ + + tcp_errors_t errors; /**< Soft connection errors */ + + f64 start_ts; /**< Timestamp when connection initialized */ + u32 last_fib_check; /**< Last time we checked fib route for peer */ + u16 mss; /**< Our max seg size that includes options */ + u32 timestamp_delta; /**< Offset for timestamp */ + u32 ipv6_flow_label; /**< flow label for ipv6 header */ + +#define rst_state snd_wl1 } tcp_connection_t; /* *INDENT-OFF* */ @@ -346,11 +438,17 @@ struct _tcp_cc_algorithm { const char *name; uword (*unformat_cfg) (unformat_input_t * input); - void (*rcv_ack) (tcp_connection_t * tc); - void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack); + void (*init) (tcp_connection_t * tc); + void (*cleanup) (tcp_connection_t * tc); + void (*rcv_ack) (tcp_connection_t * tc, tcp_rate_sample_t *rs); + void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack, + tcp_rate_sample_t *rs); void (*congestion) (tcp_connection_t * tc); + void (*loss) (tcp_connection_t * tc); void (*recovered) (tcp_connection_t * tc); - void (*init) (tcp_connection_t * tc); + void (*undo_recovery) (tcp_connection_t * tc); + void (*event) (tcp_connection_t *tc, tcp_cc_event_t evt); + u64 (*get_pacing_rate) (tcp_connection_t *tc); }; /* *INDENT-ON* */ @@ -371,6 +469,15 @@ struct _tcp_cc_algorithm #define tcp_in_cong_recovery(tc) ((tc)->flags & \ (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY)) +#define tcp_csum_offload(tc) (!((tc)->cfg_flags & TCP_CFG_F_NO_CSUM_OFFLOAD)) + +typedef void (timer_expiration_handler) (tcp_connection_t * tc); + +extern timer_expiration_handler tcp_timer_delack_handler; +extern timer_expiration_handler tcp_timer_retransmit_handler; +extern timer_expiration_handler tcp_timer_persist_handler; +extern timer_expiration_handler tcp_timer_retransmit_syn_handler; + always_inline void tcp_cong_recovery_off (tcp_connection_t * tc) { @@ -378,6 +485,10 @@ tcp_cong_recovery_off (tcp_connection_t * tc) tcp_fastrecovery_first_off (tc); } +#define tcp_zero_rwnd_sent(tc) ((tc)->flags & TCP_CONN_ZERO_RWND_SENT) +#define tcp_zero_rwnd_sent_on(tc) (tc)->flags |= TCP_CONN_ZERO_RWND_SENT +#define tcp_zero_rwnd_sent_off(tc) (tc)->flags &= ~TCP_CONN_ZERO_RWND_SENT + typedef enum _tcp_error { #define tcp_error(n,s) TCP_ERROR_##n, @@ -391,121 +502,202 @@ typedef struct _tcp_lookup_dispatch u8 next, error; } tcp_lookup_dispatch_t; +#define foreach_tcp_wrk_stat \ + _(timer_expirations, u64, "timer expirations") \ + _(rxt_segs, u64, "segments retransmitted") \ + _(tr_events, u32, "timer retransmit events") \ + _(to_closewait, u32, "timeout close-wait") \ + _(to_closewait2, u32, "timeout close-wait w/data") \ + _(to_finwait1, u32, "timeout fin-wait-1") \ + _(to_finwait2, u32, "timeout fin-wait-2") \ + _(to_lastack, u32, "timeout last-ack") \ + _(to_closing, u32, "timeout closing") \ + _(tr_abort, u32, "timer retransmit abort") \ + _(rst_unread, u32, "reset on close due to unread data") \ + +typedef struct tcp_wrk_stats_ +{ +#define _(name, type, str) type name; + foreach_tcp_wrk_stat +#undef _ +} tcp_wrk_stats_t; + typedef struct tcp_worker_ctx_ { CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); - /** worker time */ - u32 time_now; - - /** worker timer wheel */ - tw_timer_wheel_16t_2w_512sl_t timer_wheel; - - /** tx buffer free list */ - u32 *tx_buffers; - - /** tx frames for tcp 4/6 output nodes */ - vlib_frame_t *tx_frames[2]; - - /** tx frames for ip 4/6 lookup nodes */ - vlib_frame_t *ip_lookup_tx_frames[2]; - - /** vector of connections needing fast rxt */ - u32 *pending_fast_rxt; - /** vector of connections now doing fast rxt */ - u32 *ongoing_fast_rxt; - - /** vector of connections that will do fast rxt */ - u32 *postponed_fast_rxt; + /** worker's pool of connections */ + tcp_connection_t *connections; /** vector of pending ack dequeues */ u32 *pending_deq_acked; - /** vector of pending acks */ - u32 *pending_acks; - /** vector of pending disconnect notifications */ u32 *pending_disconnects; + /** vector of pending reset notifications */ + u32 *pending_resets; + /** convenience pointer to this thread's vlib main */ vlib_main_t *vm; + /** worker time */ + u32 time_now; + + /** tx frames for ip 4/6 lookup nodes */ + vlib_frame_t *ip_lookup_tx_frames[2]; + CLIB_CACHE_LINE_ALIGN_MARK (cacheline1); /** cached 'on the wire' options for bursts */ u8 cached_opts[40]; + /** tx buffer free list */ + u32 *tx_buffers; + + /* Fifo of pending timer expirations */ + u32 *pending_timers; + + /** worker timer wheel */ + tw_timer_wheel_16t_2w_512sl_t timer_wheel; + + CLIB_CACHE_LINE_ALIGN_MARK (cacheline2); + + tcp_wrk_stats_t stats; } tcp_worker_ctx_t; +#define tcp_worker_stats_inc(_ti,_stat,_val) \ + tcp_main.wrk_ctx[_ti].stats._stat += _val + +#define tcp_workerp_stats_inc(_wrk,_stat,_val) \ + _wrk->stats._stat += _val + typedef struct tcp_iss_seed_ { u64 first; u64 second; } tcp_iss_seed_t; -typedef struct _tcp_main +typedef struct tcp_configuration_ { - /* Per-worker thread tcp connection pools */ - tcp_connection_t **connections; + /** Max rx fifo size for a session (in bytes). It is used in to compute the + * rfc 7323 window scaling factor */ + u32 max_rx_fifo; - /* Pool of listeners. */ - tcp_connection_t *listener_pool; + /** Min rx fifo for a session (in bytes) */ + u32 min_rx_fifo; - /** Dispatch table by state and flags */ - tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64]; + /** Default MTU to be used when establishing connections */ + u16 default_mtu; - u8 log2_tstamp_clocks_per_tick; - f64 tstamp_ticks_per_clock; + /** Initial CWND multiplier, which multiplies MSS to determine initial CWND. + * Set 0 to determine the initial CWND by another way */ + u16 initial_cwnd_multiplier; - /** per-worker context */ - tcp_worker_ctx_t *wrk_ctx; + /** Enable tx pacing for new connections */ + u8 enable_tx_pacing; - /* Pool of half-open connections on which we've sent a SYN */ - tcp_connection_t *half_open_connections; - clib_spinlock_t half_open_lock; + /** Allow use of TSO whenever available */ + u8 allow_tso; - /* Congestion control algorithms registered */ - tcp_cc_algorithm_t *cc_algos; + /** Set if csum offloading is enabled */ + u8 csum_offload; - /** vlib buffer size */ - u32 bytes_per_buffer; + /** Default congestion control algorithm type */ + tcp_cc_algorithm_type_e cc_algo; - /* Seed used to generate random iss */ - tcp_iss_seed_t iss_seed; + /** Min rwnd, as number of snd_mss segments, for update ack to be sent after + * a zero rwnd advertisement */ + u32 rwnd_min_update_ack; - /* - * Configuration - */ + /** Delayed ack time (disabled) */ + u16 delack_time; - /* Flag that indicates if stack is on or off */ - u8 is_enabled; + /** Timer ticks to wait for close from app */ + u16 closewait_time; - /** Max rx fifo size for a session. It is used in to compute the - * rfc 7323 window scaling factor */ - u32 max_rx_fifo; + /** Timer ticks to wait in time-wait. Also known as 2MSL */ + u16 timewait_time; + + /** Timer ticks to wait in fin-wait1 to send fin and rcv fin-ack */ + u16 finwait1_time; + + /** Timer ticks to wait in last ack for ack */ + u16 lastack_time; + + /** Timer ticks to wait in fin-wait2 for fin */ + u16 finwait2_time; + + /** Timer ticks to wait in closing for fin ack */ + u16 closing_time; + + /** Timer ticks to wait before cleaning up the connection */ + u16 cleanup_time; /** Number of preallocated connections */ u32 preallocated_connections; + + /** Number of preallocated half-open connections */ u32 preallocated_half_open_connections; /** Vectors of src addresses. Optional unless one needs > 63K active-opens */ - ip4_address_t *ip4_src_addresses; - u32 last_v4_address_rotor; - u32 last_v6_address_rotor; - ip6_address_t *ip6_src_addresses; + ip4_address_t *ip4_src_addrs; + ip6_address_t *ip6_src_addrs; - /** Enable tx pacing for new connections */ - u8 tx_pacing; + /** Fault-injection. Debug only */ + f64 buffer_fail_fraction; +} tcp_configuration_t; + +typedef struct _tcp_main +{ + /** per-worker context */ + tcp_worker_ctx_t *wrk_ctx; + + /* Pool of listeners. */ + tcp_connection_t *listener_pool; + + f64 tstamp_ticks_per_clock; + + /** vlib buffer size */ + u32 bytes_per_buffer; + + /** Dispatch table by state and flags */ + tcp_lookup_dispatch_t dispatch_table[TCP_N_STATES][64]; + + clib_spinlock_t half_open_lock; + + /** Pool of half-open connections on which we've sent a SYN */ + tcp_connection_t *half_open_connections; + + /** Seed used to generate random iss */ + tcp_iss_seed_t iss_seed; + + /** Congestion control algorithms registered */ + tcp_cc_algorithm_t *cc_algos; + + /** Hash table of cc algorithms by name */ + uword *cc_algo_by_name; + + /** Last cc algo registered */ + tcp_cc_algorithm_type_e cc_last_type; + /** Flag that indicates if stack is on or off */ + u8 is_enabled; + + /** Flag that indicates if v4 punting is enabled */ u8 punt_unknown4; + + /** Flag that indicates if v6 punting is enabled */ u8 punt_unknown6; - /** fault-injection */ - f64 buffer_fail_fraction; + /** Rotor for v4 source addresses */ + u32 last_v4_addr_rotor; - /** Default congestion control algorithm type */ - tcp_cc_algorithm_type_e cc_algo; + /** Rotor for v6 source addresses */ + u32 last_v6_addr_rotor; + /** Protocol configuration */ + tcp_configuration_t cfg; } tcp_main_t; extern tcp_main_t tcp_main; @@ -513,6 +705,18 @@ extern vlib_node_registration_t tcp4_input_node; extern vlib_node_registration_t tcp6_input_node; extern vlib_node_registration_t tcp4_output_node; extern vlib_node_registration_t tcp6_output_node; +extern vlib_node_registration_t tcp4_established_node; +extern vlib_node_registration_t tcp6_established_node; +extern vlib_node_registration_t tcp4_syn_sent_node; +extern vlib_node_registration_t tcp6_syn_sent_node; +extern vlib_node_registration_t tcp4_rcv_process_node; +extern vlib_node_registration_t tcp6_rcv_process_node; +extern vlib_node_registration_t tcp4_listen_node; +extern vlib_node_registration_t tcp6_listen_node; + +#define tcp_cfg tcp_main.cfg +#define tcp_node_index(node_id, is_ip4) \ + ((is_ip4) ? tcp4_##node_id##_node.index : tcp6_##node_id##_node.index) always_inline tcp_main_t * vnet_get_tcp_main () @@ -523,6 +727,7 @@ vnet_get_tcp_main () always_inline tcp_worker_ctx_t * tcp_get_worker (u32 thread_index) { + ASSERT (thread_index < vec_len (tcp_main.wrk_ctx)); return &tcp_main.wrk_ctx[thread_index]; } @@ -550,20 +755,22 @@ void tcp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add); always_inline tcp_connection_t * tcp_connection_get (u32 conn_index, u32 thread_index) { - if (PREDICT_FALSE - (pool_is_free_index (tcp_main.connections[thread_index], conn_index))) + tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index); + if (PREDICT_FALSE (pool_is_free_index (wrk->connections, conn_index))) return 0; - return pool_elt_at_index (tcp_main.connections[thread_index], conn_index); + return pool_elt_at_index (wrk->connections, conn_index); } always_inline tcp_connection_t * tcp_connection_get_if_valid (u32 conn_index, u32 thread_index) { - if (tcp_main.connections[thread_index] == 0) + tcp_worker_ctx_t *wrk; + if (thread_index >= vec_len (tcp_main.wrk_ctx)) return 0; - if (pool_is_free_index (tcp_main.connections[thread_index], conn_index)) + wrk = tcp_get_worker (thread_index); + if (pool_is_free_index (wrk->connections, conn_index)) return 0; - return pool_elt_at_index (tcp_main.connections[thread_index], conn_index); + return pool_elt_at_index (wrk->connections, conn_index); } always_inline tcp_connection_t * @@ -576,7 +783,7 @@ always_inline void tcp_connection_set_state (tcp_connection_t * tc, tcp_state_t state) { tc->state = state; - TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc); + TCP_EVT (TCP_EVT_STATE_CHANGE, tc); } void tcp_connection_close (tcp_connection_t * tc); @@ -584,8 +791,9 @@ void tcp_connection_cleanup (tcp_connection_t * tc); void tcp_connection_del (tcp_connection_t * tc); int tcp_half_open_connection_cleanup (tcp_connection_t * tc); tcp_connection_t *tcp_connection_alloc (u8 thread_index); +tcp_connection_t *tcp_connection_alloc_w_base (u8 thread_index, + tcp_connection_t * base); void tcp_connection_free (tcp_connection_t * tc); -void tcp_connection_reset (tcp_connection_t * tc); int tcp_configure_v4_source_address_range (vlib_main_t * vm, ip4_address_t * start, ip4_address_t * end, u32 table_id); @@ -594,11 +802,15 @@ int tcp_configure_v6_source_address_range (vlib_main_t * vm, ip6_address_t * end, u32 table_id); void tcp_api_reference (void); u8 *format_tcp_connection (u8 * s, va_list * args); +u8 *format_tcp_connection_id (u8 * s, va_list * args); always_inline tcp_connection_t * tcp_listener_get (u32 tli) { - return pool_elt_at_index (tcp_main.listener_pool, tli); + tcp_connection_t *tc = 0; + if (!pool_is_free_index (tcp_main.listener_pool, tli)) + tc = pool_elt_at_index (tcp_main.listener_pool, tli); + return tc; } always_inline tcp_connection_t * @@ -620,18 +832,75 @@ void tcp_send_reset (tcp_connection_t * tc); void tcp_send_syn (tcp_connection_t * tc); void tcp_send_synack (tcp_connection_t * tc); void tcp_send_fin (tcp_connection_t * tc); -void tcp_init_mss (tcp_connection_t * tc); +void tcp_send_ack (tcp_connection_t * tc); void tcp_update_burst_snd_vars (tcp_connection_t * tc); void tcp_update_rto (tcp_connection_t * tc); -void tcp_flush_frame_to_output (tcp_worker_ctx_t * wrk, u8 is_ip4); -void tcp_flush_frames_to_output (tcp_worker_ctx_t * wrk); -void tcp_program_fastretransmit (tcp_worker_ctx_t * wrk, - tcp_connection_t * tc); -void tcp_do_fastretransmits (tcp_worker_ctx_t * wrk); +void tcp_send_window_update_ack (tcp_connection_t * tc); + +void tcp_program_ack (tcp_connection_t * tc); +void tcp_program_dupack (tcp_connection_t * tc); +void tcp_program_retransmit (tcp_connection_t * tc); -void tcp_program_ack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc); -void tcp_program_dupack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc); -void tcp_send_acks (tcp_worker_ctx_t * wrk); +/* + * Rate estimation + */ + +/** + * Byte tracker initialize + * + * @param tc connection for which the byte tracker should be allocated and + * initialized + */ +void tcp_bt_init (tcp_connection_t * tc); +/** + * Byte tracker cleanup + * + * @param tc connection for which the byte tracker should be cleaned up + */ +void tcp_bt_cleanup (tcp_connection_t * tc); +/** + * Flush byte tracker samples + * + * @param tc tcp connection for which samples should be flushed + */ +void tcp_bt_flush_samples (tcp_connection_t * tc); +/** + * Track a tcp tx burst + * + * @param tc tcp connection + */ +void tcp_bt_track_tx (tcp_connection_t * tc, u32 len); +/** + * Track a tcp retransmission + * + * @param tc tcp connection + * @param start start sequence number + * @param end end sequence number + */ +void tcp_bt_track_rxt (tcp_connection_t * tc, u32 start, u32 end); +/** + * Generate a delivery rate sample from recently acked bytes + * + * @param tc tcp connection + * @param rs resulting rate sample + */ +void tcp_bt_sample_delivery_rate (tcp_connection_t * tc, + tcp_rate_sample_t * rs); +/** + * Check if sample to be generated is app limited + * + * @param tc tcp connection + */ +void tcp_bt_check_app_limited (tcp_connection_t * tc); +/** + * Check if the byte tracker is in sane state + * + * Should be used only for testing + * + * @param bt byte tracker + */ +int tcp_bt_is_sane (tcp_byte_tracker_t * bt); +u8 *format_tcp_bt (u8 * s, va_list * args); always_inline u32 tcp_end_seq (tcp_header_t * th, u32 len) @@ -659,7 +928,8 @@ tcp_bytes_out (const tcp_connection_t * tc) if (tcp_opts_sack_permitted (&tc->rcv_opts)) return tc->sack_sb.sacked_bytes + tc->sack_sb.lost_bytes; else - return tc->rcv_dupacks * tc->snd_mss; + return clib_min (tc->rcv_dupacks * tc->snd_mss, + tc->snd_nxt - tc->snd_una); } /** @@ -670,19 +940,10 @@ tcp_flight_size (const tcp_connection_t * tc) { int flight_size; - flight_size = (int) (tc->snd_una_max - tc->snd_una) - tcp_bytes_out (tc) - + tc->snd_rxt_bytes; + flight_size = (int) (tc->snd_nxt - tc->snd_una) - tcp_bytes_out (tc) + + tc->snd_rxt_bytes - tc->rxt_delivered; - if (flight_size < 0) - { - if (0) - clib_warning - ("Negative: %u %u %u dupacks %u sacked bytes %u flags %d", - tc->snd_una_max - tc->snd_una, tcp_bytes_out (tc), - tc->snd_rxt_bytes, tc->rcv_dupacks, tc->sack_sb.sacked_bytes, - tc->rcv_opts.flags); - return 0; - } + ASSERT (flight_size >= 0); return flight_size; } @@ -693,6 +954,9 @@ tcp_flight_size (const tcp_connection_t * tc) always_inline u32 tcp_initial_cwnd (const tcp_connection_t * tc) { + if (tcp_cfg.initial_cwnd_multiplier > 0) + return tcp_cfg.initial_cwnd_multiplier * tc->snd_mss; + if (tc->snd_mss > 2190) return 2 * tc->snd_mss; else if (tc->snd_mss > 1095) @@ -723,7 +987,8 @@ tcp_cwnd_accumulate (tcp_connection_t * tc, u32 thresh, u32 bytes) always_inline u32 tcp_loss_wnd (const tcp_connection_t * tc) { - return tc->snd_mss; + /* Whatever we have in flight + the packet we're about to send */ + return tcp_flight_size (tc) + tc->snd_mss; } always_inline u32 @@ -762,22 +1027,13 @@ tcp_available_cc_snd_space (const tcp_connection_t * tc) always_inline u8 tcp_is_lost_fin (tcp_connection_t * tc) { - if ((tc->flags & TCP_CONN_FINSNT) && tc->snd_una_max - tc->snd_una == 1) + if ((tc->flags & TCP_CONN_FINSNT) && (tc->snd_una_max - tc->snd_una == 1)) return 1; return 0; } u32 tcp_snd_space (tcp_connection_t * tc); -int tcp_retransmit_first_unacked (tcp_worker_ctx_t * wrk, - tcp_connection_t * tc); -int tcp_fast_retransmit_no_sack (tcp_worker_ctx_t * wrk, - tcp_connection_t * tc, u32 burst_size); -int tcp_fast_retransmit_sack (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, - u32 burst_size); -int tcp_fast_retransmit (tcp_worker_ctx_t * wrk, tcp_connection_t * tc, - u32 burst_size); -void tcp_cc_init_congestion (tcp_connection_t * tc); -void tcp_cc_fastrecovery_exit (tcp_connection_t * tc); +int tcp_fastrecovery_prr_snd_space (tcp_connection_t * tc); fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc); @@ -797,6 +1053,16 @@ tcp_time_now_w_thread (u32 thread_index) return tcp_main.wrk_ctx[thread_index].time_now; } +/** + * Generate timestamp for tcp connection + */ +always_inline u32 +tcp_tstamp (tcp_connection_t * tc) +{ + return (tcp_main.wrk_ctx[tc->c_thread_index].time_now - + tc->timestamp_delta); +} + always_inline f64 tcp_time_now_us (u32 thread_index) { @@ -810,7 +1076,9 @@ tcp_set_time_now (tcp_worker_ctx_t * wrk) return wrk->time_now; } -u32 tcp_push_header (tcp_connection_t * tconn, vlib_buffer_t * b); +u32 tcp_session_push_header (transport_connection_t * tconn, + vlib_buffer_t * b); +int tcp_session_custom_tx (void *conn, u32 max_burst_size); void tcp_connection_timers_init (tcp_connection_t * tc); void tcp_connection_timers_reset (tcp_connection_t * tc); @@ -821,12 +1089,64 @@ void tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window, u32 start_bucket); always_inline void -tcp_cc_rcv_ack (tcp_connection_t * tc) +tcp_cc_rcv_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs) { - tc->cc_algo->rcv_ack (tc); + tc->cc_algo->rcv_ack (tc, rs); tc->tsecr_last_ack = tc->rcv_opts.tsecr; } +static inline void +tcp_cc_rcv_cong_ack (tcp_connection_t * tc, tcp_cc_ack_t ack_type, + tcp_rate_sample_t * rs) +{ + tc->cc_algo->rcv_cong_ack (tc, ack_type, rs); +} + +static inline void +tcp_cc_congestion (tcp_connection_t * tc) +{ + tc->cc_algo->congestion (tc); +} + +static inline void +tcp_cc_loss (tcp_connection_t * tc) +{ + tc->cc_algo->loss (tc); +} + +static inline void +tcp_cc_recovered (tcp_connection_t * tc) +{ + tc->cc_algo->recovered (tc); +} + +static inline void +tcp_cc_undo_recovery (tcp_connection_t * tc) +{ + if (tc->cc_algo->undo_recovery) + tc->cc_algo->undo_recovery (tc); +} + +static inline void +tcp_cc_event (tcp_connection_t * tc, tcp_cc_event_t evt) +{ + if (tc->cc_algo->event) + tc->cc_algo->event (tc, evt); +} + +static inline u64 +tcp_cc_get_pacing_rate (tcp_connection_t * tc) +{ + if (tc->cc_algo->get_pacing_rate) + return tc->cc_algo->get_pacing_rate (tc); + + f64 srtt = clib_min ((f64) tc->srtt * TCP_TICK, tc->mrtt_us); + + /* TODO should constrain to interface's max throughput but + * we don't have link speeds for sw ifs ..*/ + return ((f64) tc->cwnd / srtt); +} + always_inline void tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval) { @@ -892,16 +1212,20 @@ tcp_persist_timer_set (tcp_connection_t * tc) { /* Reuse RTO. It's backed off in handler */ tcp_timer_set (tc, TCP_TIMER_PERSIST, - clib_max (tc->rto * TCP_TO_TIMER_TICK, - TCP_TIMER_PERSIST_MIN)); + clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); } always_inline void tcp_persist_timer_update (tcp_connection_t * tc) { - tcp_timer_update (tc, TCP_TIMER_PERSIST, - clib_max (tc->rto * TCP_TO_TIMER_TICK, - TCP_TIMER_PERSIST_MIN)); + u32 interval; + + if (seq_leq (tc->snd_una, tc->snd_congestion + tc->burst_acked)) + interval = 1; + else + interval = clib_max (tc->rto * TCP_TO_TIMER_TICK, 1); + + tcp_timer_update (tc, TCP_TIMER_PERSIST, interval); } always_inline void @@ -913,7 +1237,7 @@ tcp_persist_timer_reset (tcp_connection_t * tc) always_inline void tcp_retransmit_timer_update (tcp_connection_t * tc) { - if (tc->snd_una == tc->snd_una_max) + if (tc->snd_una == tc->snd_nxt) { tcp_retransmit_timer_reset (tc); if (tc->snd_wnd < tc->snd_mss) @@ -932,14 +1256,21 @@ tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer) #define tcp_validate_txf_size(_tc, _a) \ ASSERT(_tc->state != TCP_STATE_ESTABLISHED \ - || session_tx_fifo_max_dequeue (&_tc->connection) >= _a) + || transport_max_tx_dequeue (&_tc->connection) >= _a) void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack); u8 *tcp_scoreboard_replay (u8 * s, tcp_connection_t * tc, u8 verbose); +/** + * Register exiting cc algo type + */ void tcp_cc_algo_register (tcp_cc_algorithm_type_e type, const tcp_cc_algorithm_t * vft); +/** + * Register new cc algo type + */ +tcp_cc_algorithm_type_e tcp_cc_algo_new_type (const tcp_cc_algorithm_t * vft); tcp_cc_algorithm_t *tcp_cc_algo_get (tcp_cc_algorithm_type_e type); static inline void * @@ -948,7 +1279,8 @@ tcp_cc_data (tcp_connection_t * tc) return (void *) tc->cc_data; } -void newreno_rcv_cong_ack (tcp_connection_t * tc, tcp_cc_ack_t ack_type); +void newreno_rcv_cong_ack (tcp_connection_t * tc, tcp_cc_ack_t ack_type, + tcp_rate_sample_t * rs); /** * Push TCP header to buffer @@ -983,6 +1315,8 @@ vlib_buffer_push_tcp_net_order (vlib_buffer_t * b, u16 sp, u16 dp, u32 seq, th->window = wnd; th->checksum = 0; th->urgent_pointer = 0; + vnet_buffer (b)->l4_hdr_offset = (u8 *) th - b->data; + b->flags |= VNET_BUFFER_F_L4_HDR_OFFSET_VALID; return th; }