[TCP]: Remove lost_retrans zero seqno special cases
Both high-sack detection and new lowest seq variables have unnecessary zero special case which are now removed by setting safe initial seqnos. This also fixes problem which caused zero received_upto being passed to tcp_mark_lost_retrans which confused after relations within the marker loop causing incorrect TCPCB_SACKED_RETRANS clearing. The problem was noticed because of a performance report from TAKANO Ryousei <takano@axe-inc.co.jp>. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Acked-by: Ryousei Takano <takano-ryousei@aist.go.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1121,7 +1121,7 @@ static int tcp_mark_lost_retrans(struct sock *sk, u32 received_upto)
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struct sk_buff *skb;
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int flag = 0;
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int cnt = 0;
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u32 new_low_seq = 0;
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u32 new_low_seq = tp->snd_nxt;
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tcp_for_write_queue(skb, sk) {
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u32 ack_seq = TCP_SKB_CB(skb)->ack_seq;
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@ -1153,7 +1153,7 @@ static int tcp_mark_lost_retrans(struct sock *sk, u32 received_upto)
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NET_INC_STATS_BH(LINUX_MIB_TCPLOSTRETRANSMIT);
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}
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} else {
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if (!new_low_seq || before(ack_seq, new_low_seq))
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if (before(ack_seq, new_low_seq))
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new_low_seq = ack_seq;
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cnt += tcp_skb_pcount(skb);
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}
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@ -1242,7 +1242,7 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
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int num_sacks = (ptr[1] - TCPOLEN_SACK_BASE)>>3;
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int reord = tp->packets_out;
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int prior_fackets;
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u32 highest_sack_end_seq = 0;
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u32 highest_sack_end_seq = tp->lost_retrans_low;
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int flag = 0;
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int found_dup_sack = 0;
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int cached_fack_count;
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