X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Ftcp%2Ftcp.h;h=a13a30dcb728d59612d1efafed700fc668dec08a;hb=1cfcb78940580c8e3645fca0419d32f9286e942d;hp=082ab1d8b1cf0729bfb00d7cdd2c61ee00034849;hpb=e69f4954a9de40a47f0bc27cdab0ba44e6985dac;p=vpp.git diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h index 082ab1d8b1c..a13a30dcb72 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: @@ -24,15 +24,20 @@ #include #include -#define TCP_TICK 10e-3 /**< TCP tick period (s) */ -#define THZ 1/TCP_TICK /**< TCP tick frequency */ +#define TCP_TICK 0.001 /**< TCP tick period (s) */ +#define THZ (u32) (1/TCP_TICK) /**< TCP tick frequency */ #define TCP_TSTAMP_RESOLUTION TCP_TICK /**< Time stamp resolution */ #define TCP_PAWS_IDLE 24 * 24 * 60 * 60 * THZ /**< 24 days */ +#define TCP_FIB_RECHECK_PERIOD 1 * THZ /**< Recheck every 1s */ #define TCP_MAX_OPTION_SPACE 40 +#define TCP_CC_DATA_SZ 24 -#define TCP_DUPACK_THRESHOLD 3 -#define TCP_MAX_RX_FIFO_SIZE 2 << 20 -#define TCP_IW_N_SEGMENTS 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 */ /** TCP FSM state definitions as per RFC793. */ #define foreach_tcp_fsm_state \ @@ -57,6 +62,9 @@ typedef enum _tcp_state } tcp_state_t; format_function_t format_tcp_state; +format_function_t format_tcp_flags; +format_function_t format_tcp_sacks; +format_function_t format_tcp_rcv_sacks; /** TCP timers */ #define foreach_tcp_timer \ @@ -66,7 +74,8 @@ format_function_t format_tcp_state; _(KEEP, "KEEP") \ _(WAITCLOSE, "WAIT CLOSE") \ _(RETRANSMIT_SYN, "RETRANSMIT SYN") \ - _(ESTABLISH, "ESTABLISH") + _(ESTABLISH, "ESTABLISH") \ + _(ESTABLISH_AO, "ESTABLISH_AO") \ typedef enum _tcp_timers { @@ -80,6 +89,7 @@ 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) @@ -89,26 +99,38 @@ extern timer_expiration_handler tcp_timer_retransmit_syn_handler; * 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 1 /* 0.1s */ -#define TCP_CLEANUP_TIME 5 /* 0.5s Time to wait before cleanup */ +#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_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 */ - -void tcp_update_time (f64 now, u32 thread_index); +#define TCP_RTO_BOFF_MAX 8 /* Max number of retries before reset */ /** TCP connection flags */ #define foreach_tcp_connection_flag \ - _(DELACK, "Delay ACK") \ _(SNDACK, "Send ACK") \ - _(BURSTACK, "Burst ACK set") \ _(FINSNT, "FIN sent") \ - _(SENT_RCV_WND0, "Sent 0 receive window") \ - _(RECOVERY, "Recovery on") \ - _(FAST_RECOVERY, "Fast Recovery on") + _(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") \ + _(PSH_PENDING, "PSH pending") \ + _(FINRCVD, "FIN received") \ + _(RATE_SAMPLE, "Conn does rate sampling") \ + _(TRACK_BURST, "Track burst") \ + _(ZERO_RWND_SENT, "Zero RWND sent") \ typedef enum _tcp_connection_flag_bits { @@ -126,28 +148,18 @@ 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, -}; +#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) -enum +typedef struct _scoreboard_trace_elt { -#define _(f) TCP_BUF_FLAG_##f = 1 << TCP_BUF_BIT_##f, - foreach_tcp_buf_flag -#undef _ -}; - -#define TCP_MAX_SACK_BLOCKS 5 /**< Max number of SACK blocks stored */ -#define TCP_INVALID_SACK_HOLE_INDEX ((u32)~0) + u32 start; + u32 end; + u32 ack; + u32 snd_una_max; + u32 group; +} scoreboard_trace_elt_t; typedef struct _sack_scoreboard_hole { @@ -155,18 +167,116 @@ typedef struct _sack_scoreboard_hole u32 prev; /**< Index for previous entry in linked list */ u32 start; /**< Start sequence number */ u32 end; /**< End sequence number */ + u8 is_lost; /**< Mark hole as lost */ } sack_scoreboard_hole_t; typedef struct _sack_scoreboard { sack_scoreboard_hole_t *holes; /**< Pool of holes */ - u32 head; /**< Index to first entry */ + u32 head; /**< Index of first entry */ + 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; /**< Sack bytes delivered to app */ + u32 snd_una_adv; /**< Bytes to add to snd_una */ + 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 cur_rxt_hole; /**< Retransmitting from this hole */ + +#if TCP_SCOREBOARD_TRACE + scoreboard_trace_elt_t *trace; +#endif + } sack_scoreboard_t; +#if TCP_SCOREBOARD_TRACE +#define tcp_scoreboard_trace_add(_tc, _ack) \ +{ \ + static u64 _group = 0; \ + sack_scoreboard_t *_sb = &_tc->sack_sb; \ + sack_block_t *_sack, *_sacks; \ + scoreboard_trace_elt_t *_elt; \ + int i; \ + _group++; \ + _sacks = _tc->rcv_opts.sacks; \ + for (i = 0; i < vec_len (_sacks); i++) \ + { \ + _sack = &_sacks[i]; \ + vec_add2 (_sb->trace, _elt, 1); \ + _elt->start = _sack->start; \ + _elt->end = _sack->end; \ + _elt->ack = _elt->end == _ack ? _ack : 0; \ + _elt->snd_una_max = _elt->end == _ack ? _tc->snd_una_max : 0; \ + _elt->group = _group; \ + } \ +} +#else +#define tcp_scoreboard_trace_add(_tc, _ack) +#endif + +sack_scoreboard_hole_t *scoreboard_next_rxt_hole (sack_scoreboard_t * sb, + sack_scoreboard_hole_t * + start, u8 have_sent_1_smss, + u8 * can_rescue, + u8 * snd_limited); +sack_scoreboard_hole_t *scoreboard_get_hole (sack_scoreboard_t * sb, + u32 index); + +sack_scoreboard_hole_t *scoreboard_next_hole (sack_scoreboard_t * sb, + sack_scoreboard_hole_t * hole); +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_init (sack_scoreboard_t * sb); +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, +} __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 when sample taken */ + f64 delivered_time; /**< Delivered time when sample taken */ + u64 tx_rate; /**< Tx pacing rate */ + tcp_bts_flags_t flags; /**< Sample flag */ +} tcp_bt_sample_t; + +typedef struct tcp_rate_sample_ +{ + u64 sample_delivered; /**< Delivered of sample used for rate */ + u32 delivered; /**< Bytes delivered in ack time */ + f64 ack_time; /**< Time to ack the bytes delivered */ + u64 tx_rate; /**< Tx pacing rate */ + 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; @@ -178,8 +288,14 @@ 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; + 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 */ @@ -195,6 +311,7 @@ typedef struct _tcp_connection u32 snd_wl1; /**< seq number used for last snd.wnd update */ u32 snd_wl2; /**< ack number used for last snd.wnd update */ u32 snd_nxt; /**< next seq number to be sent */ + u16 snd_mss; /**< Effective send max seg (data) size */ /** Receive sequence variables RFC793 */ u32 rcv_nxt; /**< next sequence number expected */ @@ -205,60 +322,109 @@ typedef struct _tcp_connection u32 irs; /**< initial remote sequence */ /* Options */ - tcp_options_t opt; /**< TCP connection options parsed */ - u8 rcv_wscale; /**< Window scale to advertise to peer */ - u8 snd_wscale; /**< Window scale to use when sending */ - u32 tsval_recent; /**< Last timestamp received */ - u32 tsval_recent_age; /**< When last updated tstamp_recent*/ + u8 snd_opts_len; /**< Tx options len */ + u8 rcv_wscale; /**< Window scale to advertise to peer */ + u8 snd_wscale; /**< Window scale to use when sending */ + u32 tsval_recent; /**< Last timestamp received */ + u32 tsval_recent_age; /**< When last updated tstamp_recent*/ + tcp_options_t snd_opts; /**< Tx options for 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 */ - u8 rcv_dupacks; /**< Number of DUPACKs received */ - u8 snt_dupacks; /**< Number of DUPACKs sent in a burst */ + u16 rcv_dupacks; /**< Number of DUPACKs received */ + u8 pending_dupacks; /**< Number of DUPACKs to be sent */ /* Congestion control */ u32 cwnd; /**< Congestion window */ + u32 cwnd_acc_bytes; /**< Bytes accumulated for cwnd increment */ u32 ssthresh; /**< Slow-start threshold */ u32 prev_ssthresh; /**< ssthresh before congestion */ + u32 prev_cwnd; /**< ssthresh before congestion */ u32 bytes_acked; /**< Bytes acknowledged by current segment */ - u32 rtx_bytes; /**< Retransmitted bytes */ + u32 burst_acked; /**< Bytes acknowledged in current burst */ + u32 snd_rxt_bytes; /**< Retransmitted bytes */ + u32 snd_rxt_ts; /**< Timestamp when first packet is retransmitted */ 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 */ /* RTT and RTO */ u32 rto; /**< Retransmission timeout */ u32 rto_boff; /**< Index for RTO backoff */ u32 srtt; /**< Smoothed RTT */ u32 rttvar; /**< Smoothed mean RTT difference. Approximates variance */ - u32 rtt_ts; /**< Timestamp for tracked ACK */ u32 rtt_seq; /**< Sequence number for tracked ACK */ - - u16 snd_mss; /**< Send MSS */ + f64 rtt_ts; /**< Timestamp for tracked ACK */ + f64 mrtt_us; /**< High precision mrtt from tracked acks */ + + 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 sw_if_index; /**< Interface for the connection */ + + /* 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 */ + tcp_byte_tracker_t *bt; /**< Tx byte tracker */ + + u32 last_fib_check; /**< Last time we checked fib route for peer */ + u16 mss; /**< Our max seg size that includes options */ + u32 timestamp_delta; } tcp_connection_t; +/* *INDENT-OFF* */ struct _tcp_cc_algorithm { - void (*rcv_ack) (tcp_connection_t * tc); - void (*rcv_cong_ack) (tcp_connection_t * tc, tcp_cc_ack_t ack); + const char *name; + uword (*unformat_cfg) (unformat_input_t * input); + 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); }; +/* *INDENT-ON* */ #define tcp_fastrecovery_on(tc) (tc)->flags |= TCP_CONN_FAST_RECOVERY #define tcp_fastrecovery_off(tc) (tc)->flags &= ~TCP_CONN_FAST_RECOVERY +#define tcp_recovery_on(tc) (tc)->flags |= TCP_CONN_RECOVERY +#define tcp_recovery_off(tc) (tc)->flags &= ~TCP_CONN_RECOVERY #define tcp_in_fastrecovery(tc) ((tc)->flags & TCP_CONN_FAST_RECOVERY) -#define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY)) -#define tcp_recovery_off(tc) ((tc)->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY)) +#define tcp_in_recovery(tc) ((tc)->flags & (TCP_CONN_RECOVERY)) #define tcp_in_slowstart(tc) (tc->cwnd < tc->ssthresh) +#define tcp_disconnect_pending(tc) ((tc)->flags & TCP_CONN_DCNT_PENDING) +#define tcp_disconnect_pending_on(tc) ((tc)->flags |= TCP_CONN_DCNT_PENDING) +#define tcp_disconnect_pending_off(tc) ((tc)->flags &= ~TCP_CONN_DCNT_PENDING) +#define tcp_fastrecovery_first(tc) ((tc)->flags & TCP_CONN_FRXT_FIRST) +#define tcp_fastrecovery_first_on(tc) ((tc)->flags |= TCP_CONN_FRXT_FIRST) +#define tcp_fastrecovery_first_off(tc) ((tc)->flags &= ~TCP_CONN_FRXT_FIRST) -typedef enum +#define tcp_in_cong_recovery(tc) ((tc)->flags & \ + (TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY)) + +always_inline void +tcp_cong_recovery_off (tcp_connection_t * tc) { - TCP_IP4, - TCP_IP6, - TCP_N_AF, -} tcp_af_t; + tc->flags &= ~(TCP_CONN_FAST_RECOVERY | TCP_CONN_RECOVERY); + 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 { @@ -273,6 +439,58 @@ typedef struct _tcp_lookup_dispatch u8 next, error; } tcp_lookup_dispatch_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; + + /** vector of pending ack dequeues */ + u32 *pending_deq_acked; + + /** vector of pending acks */ + u32 *pending_acks; + + /** vector of pending disconnect notifications */ + u32 *pending_disconnects; + + /** convenience pointer to this thread's vlib main */ + vlib_main_t *vm; + + CLIB_CACHE_LINE_ALIGN_MARK (cacheline1); + + /** cached 'on the wire' options for bursts */ + u8 cached_opts[40]; + +} tcp_worker_ctx_t; + +typedef struct tcp_iss_seed_ +{ + u64 first; + u64 second; +} tcp_iss_seed_t; + typedef struct _tcp_main { /* Per-worker thread tcp connection pools */ @@ -287,35 +505,67 @@ typedef struct _tcp_main u8 log2_tstamp_clocks_per_tick; f64 tstamp_ticks_per_clock; - /** per-worker tx buffer free lists */ - u32 **tx_buffers; - - /* Per worker-thread timer wheel for connections timers */ - tw_timer_wheel_16t_2w_512sl_t *timer_wheels; - - /* Convenience per worker-thread vector of connections to DELACK */ - u32 **delack_connections; + /** per-worker context */ + tcp_worker_ctx_t *wrk_ctx; /* Pool of half-open connections on which we've sent a SYN */ tcp_connection_t *half_open_connections; + clib_spinlock_t half_open_lock; - /* Pool of local TCP endpoints */ - transport_endpoint_t *local_endpoints; + /** vlib buffer size */ + u32 bytes_per_buffer; - /* Local endpoints lookup table */ - transport_endpoint_table_t local_endpoints_table; + /* 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; + + /* + * Configuration + */ + /* Flag that indicates if stack is on or off */ u8 is_enabled; - /* convenience */ - vlib_main_t *vlib_main; - vnet_main_t *vnet_main; - ip4_main_t *ip4_main; - ip6_main_t *ip6_main; + /** Max rx fifo size for a session. It is used in to compute the + * rfc 7323 window scaling factor */ + u32 max_rx_fifo; + + /** Default MTU to be used when establishing connections */ + u16 default_mtu; + + /** Initial CWND multiplier, which multiplies MSS to determine initial CWND. + * Set 0 to determine the initial CWND by another way */ + u16 initial_cwnd_multiplier; + + /** Number of preallocated connections */ + u32 preallocated_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; + + /** Enable tx pacing for new connections */ + u8 tx_pacing; + + u8 punt_unknown4; + u8 punt_unknown6; + + /** fault-injection */ + f64 buffer_fail_fraction; + + /** Default congestion control algorithm type */ + tcp_cc_algorithm_type_e cc_algo; } tcp_main_t; extern tcp_main_t tcp_main; @@ -323,6 +573,14 @@ 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; always_inline tcp_main_t * vnet_get_tcp_main () @@ -330,12 +588,38 @@ vnet_get_tcp_main () return &tcp_main; } +always_inline tcp_worker_ctx_t * +tcp_get_worker (u32 thread_index) +{ + return &tcp_main.wrk_ctx[thread_index]; +} + +always_inline tcp_header_t * +tcp_buffer_hdr (vlib_buffer_t * b) +{ + ASSERT ((signed) b->current_data >= (signed) -VLIB_BUFFER_PRE_DATA_SIZE); + return (tcp_header_t *) (b->data + b->current_data + + vnet_buffer (b)->tcp.hdr_offset); +} + +#if (VLIB_BUFFER_TRACE_TRAJECTORY) +#define tcp_trajectory_add_start(b, start) \ +{ \ + (*vlib_buffer_trace_trajectory_cb) (b, start); \ +} +#else +#define tcp_trajectory_add_start(b, start) +#endif + clib_error_t *vnet_tcp_enable_disable (vlib_main_t * vm, u8 is_en); +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 (pool_is_free_index (tcp_main.connections[thread_index], conn_index)) + if (PREDICT_FALSE + (pool_is_free_index (tcp_main.connections[thread_index], conn_index))) return 0; return pool_elt_at_index (tcp_main.connections[thread_index], conn_index); } @@ -350,13 +634,34 @@ tcp_connection_get_if_valid (u32 conn_index, u32 thread_index) return pool_elt_at_index (tcp_main.connections[thread_index], conn_index); } +always_inline tcp_connection_t * +tcp_get_connection_from_transport (transport_connection_t * tconn) +{ + return (tcp_connection_t *) tconn; +} + +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); +} + void tcp_connection_close (tcp_connection_t * tc); 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); +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); +int tcp_configure_v6_source_address_range (vlib_main_t * vm, + ip6_address_t * start, + 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_verbose (u8 * s, va_list * args); always_inline tcp_connection_t * tcp_listener_get (u32 tli) @@ -367,16 +672,95 @@ tcp_listener_get (u32 tli) always_inline tcp_connection_t * tcp_half_open_connection_get (u32 conn_index) { - return pool_elt_at_index (tcp_main.half_open_connections, conn_index); + tcp_connection_t *tc = 0; + clib_spinlock_lock_if_init (&tcp_main.half_open_lock); + if (!pool_is_free_index (tcp_main.half_open_connections, conn_index)) + tc = pool_elt_at_index (tcp_main.half_open_connections, conn_index); + clib_spinlock_unlock_if_init (&tcp_main.half_open_lock); + return tc; } -void tcp_make_ack (tcp_connection_t * ts, vlib_buffer_t * b); void tcp_make_fin (tcp_connection_t * tc, vlib_buffer_t * b); void tcp_make_synack (tcp_connection_t * ts, vlib_buffer_t * b); -void tcp_send_reset (vlib_buffer_t * pkt, u8 is_ip4); +void tcp_send_reset_w_pkt (tcp_connection_t * tc, vlib_buffer_t * pkt, + u32 thread_index, u8 is_ip4); +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_set_snd_mss (tcp_connection_t * tc); +void tcp_init_mss (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_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); +void tcp_send_window_update_ack (tcp_connection_t * tc); + +/* + * 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); +/** + * 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); always_inline u32 tcp_end_seq (tcp_header_t * th, u32 len) @@ -389,16 +773,47 @@ tcp_end_seq (tcp_header_t * th, u32 len) #define seq_leq(_s1, _s2) ((i32)((_s1)-(_s2)) <= 0) #define seq_gt(_s1, _s2) ((i32)((_s1)-(_s2)) > 0) #define seq_geq(_s1, _s2) ((i32)((_s1)-(_s2)) >= 0) +#define seq_max(_s1, _s2) (seq_gt((_s1), (_s2)) ? (_s1) : (_s2)) /* Modulo arithmetic for timestamps */ #define timestamp_lt(_t1, _t2) ((i32)((_t1)-(_t2)) < 0) #define timestamp_leq(_t1, _t2) ((i32)((_t1)-(_t2)) <= 0) +/** + * Our estimate of the number of bytes that have left the network + */ +always_inline u32 +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; +} + +/** + * Our estimate of the number of bytes in flight (pipe size) + */ always_inline u32 tcp_flight_size (const tcp_connection_t * tc) { - return tc->snd_una_max - tc->snd_una - tc->sack_sb.sacked_bytes - + tc->rtx_bytes; + int flight_size; + + flight_size = (int) (tc->snd_nxt - tc->snd_una) - tcp_bytes_out (tc) + + tc->snd_rxt_bytes; + + 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; + } + + return flight_size; } /** @@ -407,6 +822,9 @@ tcp_flight_size (const tcp_connection_t * tc) always_inline u32 tcp_initial_cwnd (const tcp_connection_t * tc) { + if (tcp_main.initial_cwnd_multiplier > 0) + return tcp_main.initial_cwnd_multiplier * tc->snd_mss; + if (tc->snd_mss > 2190) return 2 * tc->snd_mss; else if (tc->snd_mss > 1095) @@ -415,6 +833,25 @@ tcp_initial_cwnd (const tcp_connection_t * tc) return 4 * tc->snd_mss; } +/* + * Accumulate acked bytes for cwnd increase + * + * Once threshold bytes are accumulated, snd_mss bytes are added + * to the cwnd. + */ +always_inline void +tcp_cwnd_accumulate (tcp_connection_t * tc, u32 thresh, u32 bytes) +{ + tc->cwnd_acc_bytes += bytes; + if (tc->cwnd_acc_bytes >= thresh) + { + u32 inc = tc->cwnd_acc_bytes / thresh; + tc->cwnd_acc_bytes -= inc * thresh; + tc->cwnd += inc * tc->snd_mss; + tc->cwnd = clib_min (tc->cwnd, tc->tx_fifo_size); + } +} + always_inline u32 tcp_loss_wnd (const tcp_connection_t * tc) { @@ -422,15 +859,30 @@ tcp_loss_wnd (const tcp_connection_t * tc) } always_inline u32 -tcp_available_wnd (const tcp_connection_t * tc) +tcp_available_snd_wnd (const tcp_connection_t * tc) { return clib_min (tc->cwnd, tc->snd_wnd); } always_inline u32 -tcp_available_snd_space (const tcp_connection_t * tc) +tcp_available_output_snd_space (const tcp_connection_t * tc) +{ + u32 available_wnd = tcp_available_snd_wnd (tc); + int flight_size = (int) (tc->snd_nxt - tc->snd_una); + + if (available_wnd <= flight_size) + return 0; + + return available_wnd - flight_size; +} + +/** + * Estimate of how many bytes we can still push into the network + */ +always_inline u32 +tcp_available_cc_snd_space (const tcp_connection_t * tc) { - u32 available_wnd = tcp_available_wnd (tc); + u32 available_wnd = tcp_available_snd_wnd (tc); u32 flight_size = tcp_flight_size (tc); if (available_wnd <= flight_size) @@ -439,58 +891,138 @@ tcp_available_snd_space (const tcp_connection_t * tc) return available_wnd - flight_size; } -void tcp_retransmit_first_unacked (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) + 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_clear (tcp_connection_t * tc); + +fib_node_index_t tcp_lookup_rmt_in_fib (tcp_connection_t * tc); -void tcp_fast_retransmit (tcp_connection_t * tc); +/* Made public for unit testing only */ +void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end); +u32 tcp_sack_list_bytes (tcp_connection_t * tc); always_inline u32 tcp_time_now (void) { - return clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock; + return tcp_main.wrk_ctx[vlib_get_thread_index ()].time_now; +} + +always_inline u32 +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); } -u32 tcp_push_header (transport_connection_t * tconn, vlib_buffer_t * b); +always_inline f64 +tcp_time_now_us (u32 thread_index) +{ + return transport_time_now (thread_index); +} + +always_inline u32 +tcp_set_time_now (tcp_worker_ctx_t * wrk) +{ + wrk->time_now = clib_cpu_time_now () * tcp_main.tstamp_ticks_per_clock; + return wrk->time_now; +} -u32 -tcp_prepare_retransmit_segment (tcp_connection_t * tc, vlib_buffer_t * b, - u32 max_bytes); +u32 tcp_session_push_header (transport_connection_t * tconn, + vlib_buffer_t * b); void tcp_connection_timers_init (tcp_connection_t * tc); void tcp_connection_timers_reset (tcp_connection_t * tc); - +void tcp_init_snd_vars (tcp_connection_t * tc); void tcp_connection_init_vars (tcp_connection_t * tc); +void tcp_connection_tx_pacer_update (tcp_connection_t * tc); +void tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window, + u32 start_bucket); always_inline void -tcp_connection_force_ack (tcp_connection_t * tc, vlib_buffer_t * b) +tcp_cc_rcv_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs) { - /* Reset flags, make sure ack is sent */ - tc->flags = TCP_CONN_SNDACK; - vnet_buffer (b)->tcp.flags &= ~TCP_BUF_FLAG_DUPACK; + tc->cc_algo->rcv_ack (tc, rs); + tc->tsecr_last_ack = tc->rcv_opts.tsecr; } -always_inline void -tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval) +static inline void +tcp_cc_rcv_cong_ack (tcp_connection_t * tc, tcp_cc_ack_t ack_type, + tcp_rate_sample_t * rs) { - tc->timers[timer_id] - = tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index], - tc->c_c_index, timer_id, interval); + tc->cc_algo->rcv_cong_ack (tc, ack_type, rs); +} + +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); } always_inline void -tcp_retransmit_timer_set (tcp_connection_t * tc) +tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval) { - /* XXX Switch to faster TW */ - tcp_timer_set (tc, TCP_TIMER_RETRANSMIT, - clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); + ASSERT (tc->c_thread_index == vlib_get_thread_index ()); + ASSERT (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID); + tc->timers[timer_id] = + tw_timer_start_16t_2w_512sl (&tcp_main. + wrk_ctx[tc->c_thread_index].timer_wheel, + tc->c_c_index, timer_id, interval); } always_inline void tcp_timer_reset (tcp_connection_t * tc, u8 timer_id) { + ASSERT (tc->c_thread_index == vlib_get_thread_index ()); if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID) return; - tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index], + tw_timer_stop_16t_2w_512sl (&tcp_main. + wrk_ctx[tc->c_thread_index].timer_wheel, tc->timers[timer_id]); tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID; } @@ -498,74 +1030,109 @@ tcp_timer_reset (tcp_connection_t * tc, u8 timer_id) always_inline void tcp_timer_update (tcp_connection_t * tc, u8 timer_id, u32 interval) { + ASSERT (tc->c_thread_index == vlib_get_thread_index ()); if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID) - tw_timer_stop_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index], - tc->timers[timer_id]); - tc->timers[timer_id] = - tw_timer_start_16t_2w_512sl (&tcp_main.timer_wheels[tc->c_thread_index], - tc->c_c_index, timer_id, interval); + tw_timer_update_16t_2w_512sl (&tcp_main. + wrk_ctx[tc->c_thread_index].timer_wheel, + tc->timers[timer_id], interval); + else + tc->timers[timer_id] = + tw_timer_start_16t_2w_512sl (&tcp_main. + wrk_ctx[tc->c_thread_index].timer_wheel, + tc->c_c_index, timer_id, interval); } -always_inline u8 -tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer) +always_inline void +tcp_retransmit_timer_set (tcp_connection_t * tc) { - return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID; + ASSERT (tc->snd_una != tc->snd_una_max); + tcp_timer_set (tc, TCP_TIMER_RETRANSMIT, + clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); } -void -scoreboard_remove_hole (sack_scoreboard_t * sb, - sack_scoreboard_hole_t * hole); +always_inline void +tcp_retransmit_timer_reset (tcp_connection_t * tc) +{ + tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT); +} -always_inline sack_scoreboard_hole_t * -scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) +always_inline void +tcp_retransmit_timer_force_update (tcp_connection_t * tc) { - if (hole->next != TCP_INVALID_SACK_HOLE_INDEX) - return pool_elt_at_index (sb->holes, hole->next); - return 0; + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, + clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); } -always_inline sack_scoreboard_hole_t * -scoreboard_first_hole (sack_scoreboard_t * sb) +always_inline void +tcp_persist_timer_set (tcp_connection_t * tc) { - if (sb->head != TCP_INVALID_SACK_HOLE_INDEX) - return pool_elt_at_index (sb->holes, sb->head); - return 0; + /* 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)); } always_inline void -scoreboard_clear (sack_scoreboard_t * sb) +tcp_persist_timer_update (tcp_connection_t * tc) { - sack_scoreboard_hole_t *hole = scoreboard_first_hole (sb); - while ((hole = scoreboard_first_hole (sb))) - { - scoreboard_remove_hole (sb, hole); - } + tcp_timer_update (tc, TCP_TIMER_PERSIST, + clib_max (tc->rto * TCP_TO_TIMER_TICK, + TCP_TIMER_PERSIST_MIN)); } -always_inline u32 -scoreboard_hole_bytes (sack_scoreboard_hole_t * hole) +always_inline void +tcp_persist_timer_reset (tcp_connection_t * tc) { - return hole->end - hole->start; + tcp_timer_reset (tc, TCP_TIMER_PERSIST); } always_inline void -tcp_cc_algo_register (tcp_cc_algorithm_type_e type, - const tcp_cc_algorithm_t * vft) +tcp_retransmit_timer_update (tcp_connection_t * tc) { - tcp_main_t *tm = vnet_get_tcp_main (); - vec_validate (tm->cc_algos, type); + if (tc->snd_una == tc->snd_nxt) + { + tcp_retransmit_timer_reset (tc); + if (tc->snd_wnd < tc->snd_mss) + tcp_persist_timer_update (tc); + } + else + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, + clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); +} - tm->cc_algos[type] = *vft; +always_inline u8 +tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer) +{ + return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID; } -always_inline tcp_cc_algorithm_t * -tcp_cc_algo_get (tcp_cc_algorithm_type_e type) +#define tcp_validate_txf_size(_tc, _a) \ + ASSERT(_tc->state != TCP_STATE_ESTABLISHED \ + || 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 * +tcp_cc_data (tcp_connection_t * tc) { - tcp_main_t *tm = vnet_get_tcp_main (); - return &tm->cc_algos[type]; + return (void *) tc->cc_data; } -void tcp_cc_init (tcp_connection_t * tc); +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