diff options
| -rw-r--r-- | net/dccp/ccids/ccid2.c | 46 | ||||
| -rw-r--r-- | net/dccp/ccids/ccid2.h | 6 |
2 files changed, 17 insertions, 35 deletions
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c index 4f6c35261b6e..02d126d9a711 100644 --- a/net/dccp/ccids/ccid2.c +++ b/net/dccp/ccids/ccid2.c @@ -199,9 +199,8 @@ static void ccid2_hc_tx_rto_expire(unsigned long data) hctx->ccid2hctx_pipe = 0; /* clear state about stuff we sent */ - hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqh; - hctx->ccid2hctx_ssacks = 0; - hctx->ccid2hctx_acks = 0; + hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqh; + hctx->ccid2hctx_packets_acked = 0; /* clear ack ratio state. */ hctx->ccid2hctx_rpseq = 0; @@ -406,31 +405,15 @@ static inline void ccid2_new_ack(struct sock *sk, { struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk); - /* slow start */ if (hctx->ccid2hctx_cwnd < hctx->ccid2hctx_ssthresh) { - hctx->ccid2hctx_acks = 0; - - /* We can increase cwnd at most maxincr [ack_ratio/2] */ - if (*maxincr) { - /* increase every 2 acks */ - hctx->ccid2hctx_ssacks++; - if (hctx->ccid2hctx_ssacks == 2) { - hctx->ccid2hctx_cwnd++; - hctx->ccid2hctx_ssacks = 0; - *maxincr = *maxincr - 1; - } - } else { - /* increased cwnd enough for this single ack */ - hctx->ccid2hctx_ssacks = 0; - } - } else { - hctx->ccid2hctx_ssacks = 0; - hctx->ccid2hctx_acks++; - - if (hctx->ccid2hctx_acks >= hctx->ccid2hctx_cwnd) { - hctx->ccid2hctx_cwnd++; - hctx->ccid2hctx_acks = 0; + if (*maxincr > 0 && ++hctx->ccid2hctx_packets_acked == 2) { + hctx->ccid2hctx_cwnd += 1; + *maxincr -= 1; + hctx->ccid2hctx_packets_acked = 0; } + } else if (++hctx->ccid2hctx_packets_acked >= hctx->ccid2hctx_cwnd) { + hctx->ccid2hctx_cwnd += 1; + hctx->ccid2hctx_packets_acked = 0; } /* update RTO */ @@ -596,12 +579,13 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) } } - /* If in slow-start, cwnd can increase at most Ack Ratio / 2 packets for - * this single ack. I round up. - * -sorbo. + /* + * In slow-start, cwnd can increase up to a maximum of Ack Ratio/2 + * packets per acknowledgement. Rounding up avoids that cwnd is not + * advanced when Ack Ratio is 1 and gives a slight edge otherwise. */ - maxincr = dp->dccps_l_ack_ratio >> 1; - maxincr++; + if (hctx->ccid2hctx_cwnd < hctx->ccid2hctx_ssthresh) + maxincr = DIV_ROUND_UP(dp->dccps_l_ack_ratio, 2); /* go through all ack vectors */ while ((offset = ccid2_ackvector(sk, skb, offset, diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h index 2671f8ebe294..2c94ca029010 100644 --- a/net/dccp/ccids/ccid2.h +++ b/net/dccp/ccids/ccid2.h @@ -43,8 +43,7 @@ struct ccid2_seq { /** struct ccid2_hc_tx_sock - CCID2 TX half connection * * @ccid2hctx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5 - * @ccid2hctx_ssacks - ACKs recv in slow start - * @ccid2hctx_acks - ACKS recv in AI phase + * @ccid2hctx_packets_acked - Ack counter for deriving cwnd growth (RFC 3465) * @ccid2hctx_lastrtt -time RTT was last measured * @ccid2hctx_rpseq - last consecutive seqno * @ccid2hctx_rpdupack - dupacks since rpseq @@ -53,8 +52,7 @@ struct ccid2_hc_tx_sock { u32 ccid2hctx_cwnd; u32 ccid2hctx_ssthresh; u32 ccid2hctx_pipe; - int ccid2hctx_ssacks; - int ccid2hctx_acks; + u32 ccid2hctx_packets_acked; struct ccid2_seq *ccid2hctx_seqbuf[CCID2_SEQBUF_MAX]; int ccid2hctx_seqbufc; struct ccid2_seq *ccid2hctx_seqh; |