diff options
Diffstat (limited to 'src/vnet/tcp/tcp.h')
| -rw-r--r-- | src/vnet/tcp/tcp.h | 112 |
1 files changed, 94 insertions, 18 deletions
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h index c3ebe22b..071f1ab1 100644 --- a/src/vnet/tcp/tcp.h +++ b/src/vnet/tcp/tcp.h @@ -34,6 +34,7 @@ #define TCP_MAX_RX_FIFO_SIZE 2 << 20 #define TCP_IW_N_SEGMENTS 10 #define TCP_ALWAYS_ACK 0 /**< If on, we always ack */ +#define TCP_USE_SACKS 1 /**< Disable only for testing */ /** TCP FSM state definitions as per RFC793. */ #define foreach_tcp_fsm_state \ @@ -94,7 +95,7 @@ extern timer_expiration_handler tcp_timer_retransmit_syn_handler; #define TCP_DELACK_TIME 1 /* 0.1s */ #define TCP_ESTABLISH_TIME 750 /* 75s */ #define TCP_2MSL_TIME 300 /* 30s */ -#define TCP_CLOSEWAIT_TIME 1 /* 0.1s */ +#define TCP_CLOSEWAIT_TIME 20 /* 0.1s */ #define TCP_CLEANUP_TIME 5 /* 0.5s Time to wait before cleanup */ #define TCP_TIMER_PERSIST_MIN 2 /* 0.2s */ @@ -157,6 +158,7 @@ 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 @@ -166,8 +168,13 @@ 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 max_byte_sacked; /**< Highest byte acked */ + 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 */ } sack_scoreboard_t; typedef enum _tcp_cc_algorithm_type @@ -211,7 +218,7 @@ typedef struct _tcp_connection u32 irs; /**< initial remote sequence */ /* Options */ - tcp_options_t opt; /**< TCP connection options parsed */ + tcp_options_t rcv_opts; /**< Rx options for connection */ tcp_options_t snd_opts; /**< Tx options for connection */ u8 snd_opts_len; /**< Tx options len */ u8 rcv_wscale; /**< Window scale to advertise to peer */ @@ -229,8 +236,10 @@ typedef struct _tcp_connection u32 cwnd; /**< Congestion window */ 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 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 */ tcp_cc_algorithm_t *cc_algo; /**< Congestion control algorithm */ @@ -411,6 +420,7 @@ void tcp_send_syn (tcp_connection_t * tc); void tcp_send_fin (tcp_connection_t * tc); void tcp_init_mss (tcp_connection_t * tc); void tcp_update_snd_mss (tcp_connection_t * tc); +void tcp_update_rto (tcp_connection_t * tc); always_inline u32 tcp_end_seq (tcp_header_t * th, u32 len) @@ -428,17 +438,39 @@ tcp_end_seq (tcp_header_t * th, u32 len) #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) { int flight_size; - flight_size = (int) ((tc->snd_una_max - tc->snd_una) + tc->rtx_bytes) - - (tc->rcv_dupacks * tc->snd_mss) /* - tc->sack_sb.sacked_bytes */ ; + flight_size = (int) (tc->snd_una_max - tc->snd_una) - tcp_bytes_out (tc) + + tc->snd_rxt_bytes; - /* Happens if we don't clear sacked bytes */ if (flight_size < 0) - return 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; } @@ -481,14 +513,17 @@ tcp_available_snd_space (const tcp_connection_t * tc) return available_wnd - flight_size; } -u32 tcp_rcv_wnd_available (tcp_connection_t * tc); +i32 tcp_rcv_wnd_available (tcp_connection_t * tc); u32 tcp_snd_space (tcp_connection_t * tc); void tcp_update_rcv_wnd (tcp_connection_t * tc); void tcp_retransmit_first_unacked (tcp_connection_t * tc); +void tcp_fast_retransmit_no_sack (tcp_connection_t * tc); +void tcp_fast_retransmit_sack (tcp_connection_t * tc); void tcp_fast_retransmit (tcp_connection_t * tc); -void tcp_cc_congestion (tcp_connection_t * tc); -void tcp_cc_recover (tcp_connection_t * tc); +void tcp_cc_init_congestion (tcp_connection_t * tc); +int tcp_cc_recover (tcp_connection_t * tc); +void tcp_cc_fastrecovery_exit (tcp_connection_t * tc); /* Made public for unit testing only */ void tcp_update_sack_list (tcp_connection_t * tc, u32 start, u32 end); @@ -563,16 +598,16 @@ tcp_retransmit_timer_set (tcp_connection_t * tc) } always_inline void -tcp_retransmit_timer_update (tcp_connection_t * tc) +tcp_retransmit_timer_reset (tcp_connection_t * tc) { - tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, - clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); + tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT); } always_inline void -tcp_retransmit_timer_reset (tcp_connection_t * tc) +tcp_retransmit_timer_force_update (tcp_connection_t * tc) { - tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT); + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, + clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); } always_inline void @@ -598,15 +633,43 @@ tcp_persist_timer_reset (tcp_connection_t * tc) tcp_timer_reset (tc, TCP_TIMER_PERSIST); } +always_inline void +tcp_retransmit_timer_update (tcp_connection_t * tc) +{ + if (tc->snd_una == tc->snd_una_max) + { + tcp_retransmit_timer_reset (tc); + if (tc->snd_wnd < tc->snd_mss) + tcp_persist_timer_set (tc); + } + else + tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, + clib_max (tc->rto * TCP_TO_TIMER_TICK, 1)); +} + always_inline u8 tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer) { return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID; } +#define tcp_validate_txf_size(_tc, _a) \ + ASSERT(_tc->state != TCP_STATE_ESTABLISHED \ + || stream_session_tx_fifo_max_dequeue (&_tc->connection) >= _a) + void scoreboard_remove_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole); +void scoreboard_update_lost (tcp_connection_t * tc, sack_scoreboard_t * sb); +sack_scoreboard_hole_t *scoreboard_insert_hole (sack_scoreboard_t * sb, + u32 prev_index, u32 start, + u32 end); +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); +void scoreboard_init_high_rxt (sack_scoreboard_t * sb); always_inline sack_scoreboard_hole_t * scoreboard_get_hole (sack_scoreboard_t * sb, u32 index) @@ -625,6 +688,14 @@ scoreboard_next_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) } always_inline sack_scoreboard_hole_t * +scoreboard_prev_hole (sack_scoreboard_t * sb, sack_scoreboard_hole_t * hole) +{ + if (hole->prev != TCP_INVALID_SACK_HOLE_INDEX) + return pool_elt_at_index (sb->holes, hole->prev); + return 0; +} + +always_inline sack_scoreboard_hole_t * scoreboard_first_hole (sack_scoreboard_t * sb) { if (sb->head != TCP_INVALID_SACK_HOLE_INDEX) @@ -643,15 +714,19 @@ scoreboard_last_hole (sack_scoreboard_t * sb) always_inline void scoreboard_clear (sack_scoreboard_t * sb) { - sack_scoreboard_hole_t *hole = scoreboard_first_hole (sb); + sack_scoreboard_hole_t *hole; while ((hole = scoreboard_first_hole (sb))) { scoreboard_remove_hole (sb, hole); } sb->sacked_bytes = 0; sb->last_sacked_bytes = 0; + sb->last_bytes_delivered = 0; sb->snd_una_adv = 0; - sb->max_byte_sacked = 0; + sb->high_sacked = 0; + sb->high_rxt = 0; + sb->lost_bytes = 0; + sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; } always_inline u32 @@ -671,6 +746,7 @@ scoreboard_init (sack_scoreboard_t * sb) { sb->head = TCP_INVALID_SACK_HOLE_INDEX; sb->tail = TCP_INVALID_SACK_HOLE_INDEX; + sb->cur_rxt_hole = TCP_INVALID_SACK_HOLE_INDEX; } void tcp_rcv_sacks (tcp_connection_t * tc, u32 ack); |