Signed-off-by: Ilpo Järvinen <[EMAIL PROTECTED]>
---
net/ipv4/tcp_input.c | 31 ++++++++++++++++---------------
1 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index dbc98ce..870404b 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1733,6 +1733,20 @@ static inline void tcp_reset_reno_sack(s
tp->left_out = tp->lost_out;
}
+/* RFC: This is from the original, I doubt that this is necessary at all:
+ * clear xmit_retrans hint if seq of this skb is beyond hint. How could we
+ * retransmitted past LOST markings in the first place? I'm not fully sure
+ * about undo and end of connection cases, which can cause R without L?
+ */
+static void tcp_verify_retransmit_hint(struct tcp_sock *tp,
+ struct sk_buff *skb)
+{
+ if ((tp->retransmit_skb_hint != NULL) &&
+ before(TCP_SKB_CB(skb)->seq,
+ TCP_SKB_CB(tp->retransmit_skb_hint)->seq))
+ tp->retransmit_skb_hint = skb;
+}
+
/* Mark head of queue up as lost. */
static void tcp_mark_head_lost(struct sock *sk, struct tcp_sock *tp,
int packets, u32 high_seq)
@@ -1762,14 +1776,7 @@ static void tcp_mark_head_lost(struct so
if (!(TCP_SKB_CB(skb)->sacked&TCPCB_TAGBITS)) {
TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
tp->lost_out += tcp_skb_pcount(skb);
-
- /* clear xmit_retransmit_queue hints
- * if this is beyond hint */
- if (tp->retransmit_skb_hint != NULL &&
- before(TCP_SKB_CB(skb)->seq,
- TCP_SKB_CB(tp->retransmit_skb_hint)->seq))
- tp->retransmit_skb_hint = NULL;
-
+ tcp_verify_retransmit_hint(tp, skb);
}
}
tcp_sync_left_out(tp);
@@ -1808,13 +1815,7 @@ static void tcp_update_scoreboard(struct
if (!(TCP_SKB_CB(skb)->sacked&TCPCB_TAGBITS)) {
TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
tp->lost_out += tcp_skb_pcount(skb);
-
- /* clear xmit_retrans hint */
- if (tp->retransmit_skb_hint &&
- before(TCP_SKB_CB(skb)->seq,
-
TCP_SKB_CB(tp->retransmit_skb_hint)->seq))
-
- tp->retransmit_skb_hint = NULL;
+ tcp_verify_retransmit_hint(tp, skb);
}
}
--
1.4.2
-
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