[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>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 0f00966b1784..9288220b73a8 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1121,7 +1121,7 @@ static int tcp_mark_lost_retrans(struct sock *sk, u32 received_upto)
         struct sk_buff *skb;
         int flag = 0;
         int cnt = 0;
-        u32 new_low_seq = 0;
+        u32 new_low_seq = tp->snd_nxt;
 
         tcp_for_write_queue(skb, sk) {
                 u32 ack_seq = TCP_SKB_CB(skb)->ack_seq;
@@ -1153,7 +1153,7 @@ static int tcp_mark_lost_retrans(struct sock *sk, u32 received_upto)
                                 NET_INC_STATS_BH(LINUX_MIB_TCPLOSTRETRANSMIT);
                         }
                 } else {
-                        if (!new_low_seq || before(ack_seq, new_low_seq))
+                        if (before(ack_seq, new_low_seq))
                                 new_low_seq = ack_seq;
                         cnt += tcp_skb_pcount(skb);
                 }
@@ -1242,7 +1242,7 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
         int num_sacks = (ptr[1] - TCPOLEN_SACK_BASE)>>3;
         int reord = tp->packets_out;
         int prior_fackets;
-        u32 highest_sack_end_seq = 0;
+        u32 highest_sack_end_seq = tp->lost_retrans_low;
         int flag = 0;
         int found_dup_sack = 0;
         int cached_fack_count;