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Ensure cwnd doesn't shrink to zero with PRR

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Under some circumstances, PRR may end up with a fully
collapsed cwnd when finalizing the loss recovery.

Reviewed By:	#transport, kbowling
Reported by:	Liang Tian
MFC after:	1 week
Sponsored by:	NetApp, Inc.
Differential Revision:	https://reviews.freebsd.org/D28780
This commit is contained in:
Richard Scheffenegger 2021-02-19 13:52:06 +01:00
parent 248a47a4c2
commit 853fd7a2e3
1 changed files with 2 additions and 2 deletions
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4
sys/netinet/tcp_input.c
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@ -3990,8 +3990,8 @@ tcp_prr_partialack(struct tcpcb *tp, struct tcphdr *th)
* If there is going to be a SACK retransmission, adjust snd_cwnd
* accordingly.
*/
tp->snd_cwnd = tp->snd_nxt - tp->snd_recover +
tp->sackhint.sack_bytes_rexmit + (snd_cnt * maxseg);
tp->snd_cwnd = max(maxseg, (int64_t)tp->snd_nxt - tp->snd_recover +
tp->sackhint.sack_bytes_rexmit + (snd_cnt * maxseg));
tp->t_flags |= TF_ACKNOW;
(void) tcp_output(tp);
}