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tcp: Don't clear hints when tcp_fragmenting 

1) We didn't remove any skbs, so no need to handle stale refs.

2) scoreboard_skb_hint is trivial, no timestamps were changed
   so no need to clear that one

3) lost_skb_hint needs tweaking similar to that of
   tcp_sacktag_one().

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Ilpo Järvinen 2009-02-28 04:44:30 +00:00 committed by David S. Miller
parent 62ad27619c
commit d3d2ae4545
1 changed files with 6 additions and 1 deletions
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7
net/ipv4/tcp_output.c
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@ -771,7 +771,6 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
BUG_ON(len > skb->len);
tcp_clear_retrans_hints_partial(tp);
nsize = skb_headlen(skb) - len;
if (nsize < 0)
nsize = 0;
@ -854,6 +853,12 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
tcp_verify_left_out(tp);
}
tcp_adjust_fackets_out(sk, skb, diff);
if (tp->lost_skb_hint &&
before(TCP_SKB_CB(skb)->seq,
TCP_SKB_CB(tp->lost_skb_hint)->seq) &&
(tcp_is_fack(tp) || TCP_SKB_CB(skb)->sacked))
tp->lost_cnt_hint -= diff;
}
/* Link BUFF into the send queue. */