Lukas Prause
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* TCP ROCCET congestion control interface
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*/
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#ifndef __TCP_ROCCET_H
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#define __TCP_ROCCET_H 1
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#include <linux/math64.h>
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/* State in which roccet currently operates */
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enum roccet_state {
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LAUNCH,
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ORBITER,
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RTT_PROBE_ENTER,
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RTT_PROBE,
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RTT_PROBE_REFILL,
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DRAIN
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};
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/* TCP ROCCET struct based on the original BICTCP struct with
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* additions specific to the ROCCET-Algorithm.
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*/
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struct roccettcp {
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u32 cnt; /* increase cwnd by 1 after ACKs */
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u32 last_max_cwnd; /* last maximum snd_cwnd */
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u32 last_cwnd; /* the last snd_cwnd */
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u32 last_time; /* time when updated last_cwnd */
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u32 bic_origin_point; /* origin point of bic function */
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u32 bic_K; /* time to origin point from the
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* beginning of the current epoch
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*/
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u32 delay_min; /* min delay (usec) */
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u32 epoch_start; /* beginning of an epoch */
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u32 ack_cnt; /* number of acks */
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u32 tcp_cwnd; /* estimated tcp cwnd */
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u32 curr_rtt; /* last sample rtt of current round */
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u32 roccet_last_event_time_us; /* The last time ROCCET was triggered */
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u32 curr_min_rtt; /* The current observed minRTT */
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u32 next_min_rtt_probe; /* Next time to probe the minRTT */
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u32 probe_min_rtt_until; /* End of minRTT probing period.
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* Set while in RTT_PROBE states
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*/
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u32 refill_until; /* End of pipe refill after minRTT probe.
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* Set while in RTT_PROBE states
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*/
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u32 cwnd_before_min_rtt_probe; /* cwnd before min RTT probing. */
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u32 curr_srrtt; /* srRTT calculated based on the latest ACK */
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u32 next_srrtt_check_ts; /* Next check for srRTT */
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u32 last_rtt; /* sample rtt of previous round.
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* Used for jitter calculation
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*/
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u32 interval_snd_seq_start;
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u32 interval_una_seq_start;
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u32 ack_rate_last_rate_time; /* Timestamp of the last ACK-rate */
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u16 ack_rate_last_rate; /* Last ACK-rate */
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u16 ack_rate_curr_rate; /* Current ACK-rate */
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u16 ack_rate_cnt; /* Used for counting acks */
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enum roccet_state state : 3; /* Current operating state of roccet */
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bool was_idle : 1; /* Tracks whether the connection was idle
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* (had no in-flight packets)
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*/
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bool initial_limit_reached: 1; /* Set to true after the connection
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* initially gets cwnd-limited
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*/
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bool is_in_initial_launch: 1; /* true if the connection is in
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* the initial launch phase.
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*/
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u32 ack_carry_over; /* Used to carry over leftover acks from
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* LAUNCH to ORBITER
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*/
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};
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#endif /* __TCP_ROCCET_H */
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