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fix several bugs, add tcp_nack CC, remove prints #10

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fix several bugs, add tcp_nack CC, remove prints #10

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215bc04
fix old_ack NACK discard, add tcp_nack CC, remove prints
vali0901 Jun 17, 2026
479df08
Add decrease_factor for cwnd reduction + set init ssthresh to infinite
vali0901 Jun 18, 2026
5a2d9ff
Several bugfixes and features:
vali0901 Jun 18, 2026
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2 changes: 2 additions & 0 deletions include/net/tcp.h
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Original file line number Diff line number Diff line change
Expand Up @@ -691,6 +691,7 @@ void tcp_reset(struct sock *sk, struct sk_buff *skb);
void tcp_fin(struct sock *sk);
void tcp_check_space(struct sock *sk);
void tcp_sack_compress_send_ack(struct sock *sk);
void tcp_update_pacing_rate(struct sock *sk);

static inline void tcp_cleanup_skb(struct sk_buff *skb)
{
Expand Down Expand Up @@ -954,6 +955,7 @@ enum tcp_skb_cb_sacked_flags {
TCPCB_LOST = (1 << 2), /* SKB is lost */
TCPCB_TAGBITS = (TCPCB_SACKED_ACKED | TCPCB_SACKED_RETRANS |
TCPCB_LOST), /* All tag bits */
TCPCB_NACK_FORCED = (1 << 3), /* Trimming: NACK-signalled, retransmit past cwnd gate */
TCPCB_REPAIRED = (1 << 4), /* SKB repaired (no skb_mstamp_ns) */
TCPCB_EVER_RETRANS = (1 << 7), /* Ever retransmitted frame */
TCPCB_RETRANS = (TCPCB_SACKED_RETRANS | TCPCB_EVER_RETRANS |
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9 changes: 9 additions & 0 deletions net/ipv4/Kconfig
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Expand Up @@ -647,6 +647,15 @@ config TCP_CONG_DCTCP
For further details see:
http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf

config TCP_CONG_NACK
tristate "NACK-based congestion control (experimental)"
default m
help
Experimental congestion control intended for trimming experiments.
When a trimming NACK is received, this algorithm reduces the
congestion window by one MSS (one segment). Useful for quick
experiments with NACK-driven rate reduction.

config TCP_CONG_CDG
tristate "CAIA Delay-Gradient (CDG)"
default n
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1 change: 1 addition & 0 deletions net/ipv4/Makefile
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Expand Up @@ -49,6 +49,7 @@ obj-$(CONFIG_TCP_CONG_BIC) += tcp_bic.o
obj-$(CONFIG_TCP_CONG_CDG) += tcp_cdg.o
obj-$(CONFIG_TCP_CONG_CUBIC) += tcp_cubic.o
obj-$(CONFIG_TCP_CONG_DCTCP) += tcp_dctcp.o
obj-$(CONFIG_TCP_CONG_NACK) += tcp_nack.o
obj-$(CONFIG_TCP_CONG_WESTWOOD) += tcp_westwood.o
obj-$(CONFIG_TCP_CONG_HSTCP) += tcp_highspeed.o
obj-$(CONFIG_TCP_CONG_HYBLA) += tcp_hybla.o
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