tcp: Correctly compute the TCP goodput in bits per second by using SEQ_SUB().
TCP sequence number differences should be computed using SEQ_SUB(). Differential Revision: https://reviews.freebsd.org/D35505 Reviewed by: rscheff@ MFC after: 1 week Sponsored by: NVIDIA Networking
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@ -324,7 +324,7 @@ cc_ack_received(struct tcpcb *tp, struct tcphdr *th, uint16_t nsegs,
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/*
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* Compute goodput in bits per millisecond.
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*/
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gput = (((int64_t)(th->th_ack - tp->gput_seq)) << 3) /
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gput = (((int64_t)SEQ_SUB(th->th_ack, tp->gput_seq)) << 3) /
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max(1, tcp_ts_getticks() - tp->gput_ts);
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stats_voi_update_abs_u32(tp->t_stats, VOI_TCP_GPUT,
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gput);
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