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tcp: fix cwnd recalculation during limited transmit
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Authored by rscheff on Nov 13 2024, 6:58 PM.
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Details

Summary

During limited transmit, one additional segment should be
sent for each incoming ACK. As tcp_output considers the
SACKed bytes, adjust for this in the limited transmit
recalculation.
Also, in case snd_nxt is lower than snd_max (after an RTO),
let tcp_output only consider retransmissions from the SACK
scoreboard when again in fast recovery mode, or dupthresh
dupacks have been seen.

PR: 282605

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rG FreeBSD src repository
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