Address two incorrect calculations and enhance readability of PRR code
- address second instance of cwnd potentially becoming zero - fix sublte bug due to implicit int to uint typecase in max() - fix bug due to typo in hand-coded CEILING() function by using howmany() macro - use int instead of long, and add a missing long typecast - replace if conditionals with easier to read imax/imin (as in pseudocode) Reviewed By: #transport, kbowling MFC after: 3 days Sponsored by: NetApp, Inc. Differential Revision: https://reviews.freebsd.org/D28813
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@ -2570,8 +2570,8 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
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if (V_tcp_do_prr &&
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IN_FASTRECOVERY(tp->t_flags) &&
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(tp->t_flags & TF_SACK_PERMIT)) {
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long snd_cnt = 0, limit = 0;
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long del_data = 0, pipe = 0;
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int snd_cnt = 0, limit = 0;
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int del_data = 0, pipe = 0;
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/*
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* In a duplicate ACK del_data is only the
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* diff_in_sack. If no SACK is used del_data
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@ -2588,39 +2588,29 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so,
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if (pipe > tp->snd_ssthresh) {
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if (tp->sackhint.recover_fs == 0)
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tp->sackhint.recover_fs =
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max(1, tp->snd_nxt - tp->snd_una);
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snd_cnt = (tp->sackhint.prr_delivered *
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tp->snd_ssthresh /
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tp->sackhint.recover_fs) +
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1 - tp->sackhint.sack_bytes_rexmit;
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imax(1, tp->snd_nxt - tp->snd_una);
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snd_cnt = howmany((long)tp->sackhint.prr_delivered *
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tp->snd_ssthresh, tp->sackhint.recover_fs) -
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tp->sackhint.sack_bytes_rexmit;
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} else {
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if (V_tcp_do_prr_conservative)
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limit = tp->sackhint.prr_delivered -
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tp->sackhint.sack_bytes_rexmit;
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else
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if ((tp->sackhint.prr_delivered -
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tp->sackhint.sack_bytes_rexmit) >
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del_data)
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limit = tp->sackhint.prr_delivered -
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tp->sackhint.sack_bytes_rexmit +
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maxseg;
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else
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limit = del_data + maxseg;
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if ((tp->snd_ssthresh - pipe) < limit)
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snd_cnt = tp->snd_ssthresh - pipe;
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else
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snd_cnt = limit;
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limit = imax(tp->sackhint.prr_delivered -
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tp->sackhint.sack_bytes_rexmit,
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del_data) + maxseg;
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snd_cnt = imin(tp->snd_ssthresh - pipe, limit);
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}
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snd_cnt = max((snd_cnt / maxseg), 0);
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snd_cnt = imax(snd_cnt, 0) / maxseg;
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/*
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* Send snd_cnt new data into the network in
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* response to this ACK. If there is a going
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* to be a SACK retransmission, adjust snd_cwnd
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* accordingly.
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*/
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tp->snd_cwnd = tp->snd_nxt - tp->snd_recover +
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tp->sackhint.sack_bytes_rexmit +
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(snd_cnt * maxseg);
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tp->snd_cwnd = imax(maxseg, tp->snd_nxt - tp->snd_recover +
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tp->sackhint.sack_bytes_rexmit + (snd_cnt * maxseg));
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} else if ((tp->t_flags & TF_SACK_PERMIT) &&
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IN_FASTRECOVERY(tp->t_flags)) {
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int awnd;
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@ -3948,7 +3938,7 @@ tcp_mssopt(struct in_conninfo *inc)
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void
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tcp_prr_partialack(struct tcpcb *tp, struct tcphdr *th)
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{
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long snd_cnt = 0, limit = 0, del_data = 0, pipe = 0;
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int snd_cnt = 0, limit = 0, del_data = 0, pipe = 0;
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int maxseg = tcp_maxseg(tp);
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INP_WLOCK_ASSERT(tp->t_inpcb);
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@ -3974,29 +3964,27 @@ tcp_prr_partialack(struct tcpcb *tp, struct tcphdr *th)
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if (pipe > tp->snd_ssthresh) {
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if (tp->sackhint.recover_fs == 0)
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tp->sackhint.recover_fs =
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max(1, tp->snd_nxt - tp->snd_una);
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snd_cnt = (tp->sackhint.prr_delivered * tp->snd_ssthresh /
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tp->sackhint.recover_fs) - tp->sackhint.sack_bytes_rexmit;
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imax(1, tp->snd_nxt - tp->snd_una);
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snd_cnt = howmany((long)tp->sackhint.prr_delivered *
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tp->snd_ssthresh, tp->sackhint.recover_fs) -
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tp->sackhint.sack_bytes_rexmit;
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} else {
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if (V_tcp_do_prr_conservative)
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limit = tp->sackhint.prr_delivered -
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tp->sackhint.sack_bytes_rexmit;
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else
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if ((tp->sackhint.prr_delivered -
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tp->sackhint.sack_bytes_rexmit) > del_data)
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limit = tp->sackhint.prr_delivered -
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tp->sackhint.sack_bytes_rexmit + maxseg;
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else
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limit = del_data + maxseg;
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snd_cnt = min((tp->snd_ssthresh - pipe), limit);
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limit = imax(tp->sackhint.prr_delivered -
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tp->sackhint.sack_bytes_rexmit,
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del_data) + maxseg;
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snd_cnt = imin((tp->snd_ssthresh - pipe), limit);
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}
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snd_cnt = max((snd_cnt / maxseg), 0);
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snd_cnt = imax(snd_cnt, 0) / maxseg;
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/*
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* Send snd_cnt new data into the network in response to this ack.
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* If there is going to be a SACK retransmission, adjust snd_cwnd
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* accordingly.
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*/
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tp->snd_cwnd = max(maxseg, (int64_t)tp->snd_nxt - tp->snd_recover +
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tp->snd_cwnd = imax(maxseg, tp->snd_nxt - tp->snd_recover +
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tp->sackhint.sack_bytes_rexmit + (snd_cnt * maxseg));
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tp->t_flags |= TF_ACKNOW;
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(void) tcp_output(tp);
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