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Date: Mon, 24 Nov 2008 16:22:02 +0200
From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org,
"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Subject: [PATCH 05/10] tcp: make tcp_sacktag_one able to handle partial skb too
This is preparatory work for SACK combiner patch which may
have to count TCP state changes for only a part of the skb
because it will intentionally avoids splitting skb to SACKed
and not sacked parts.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
---
net/ipv4/tcp_input.c | 32 +++++++++++++++++---------------
1 files changed, 17 insertions(+), 15 deletions(-)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 5e1e121..94533e4 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1288,7 +1288,8 @@ static int tcp_match_skb_to_sack(struct sock *sk, struct sk_buff *skb,
}
static int tcp_sacktag_one(struct sk_buff *skb, struct sock *sk,
- int *reord, int dup_sack, int fack_count)
+ int *reord, int dup_sack, int fack_count,
+ u8 *sackedto, int pcount)
{
struct tcp_sock *tp = tcp_sk(sk);
u8 sacked = TCP_SKB_CB(skb)->sacked;
@@ -1313,10 +1314,9 @@ static int tcp_sacktag_one(struct sk_buff *skb, struct sock *sk,
* that retransmission is still in flight.
*/
if (sacked & TCPCB_LOST) {
- TCP_SKB_CB(skb)->sacked &=
- ~(TCPCB_LOST|TCPCB_SACKED_RETRANS);
- tp->lost_out -= tcp_skb_pcount(skb);
- tp->retrans_out -= tcp_skb_pcount(skb);
+ *sackedto &= ~(TCPCB_LOST|TCPCB_SACKED_RETRANS);
+ tp->lost_out -= pcount;
+ tp->retrans_out -= pcount;
}
} else {
if (!(sacked & TCPCB_RETRANS)) {
@@ -1333,22 +1333,22 @@ static int tcp_sacktag_one(struct sk_buff *skb, struct sock *sk,
}
if (sacked & TCPCB_LOST) {
- TCP_SKB_CB(skb)->sacked &= ~TCPCB_LOST;
- tp->lost_out -= tcp_skb_pcount(skb);
+ *sackedto &= ~TCPCB_LOST;
+ tp->lost_out -= pcount;
}
}
- TCP_SKB_CB(skb)->sacked |= TCPCB_SACKED_ACKED;
+ *sackedto |= TCPCB_SACKED_ACKED;
flag |= FLAG_DATA_SACKED;
- tp->sacked_out += tcp_skb_pcount(skb);
+ tp->sacked_out += pcount;
- fack_count += tcp_skb_pcount(skb);
+ fack_count += pcount;
/* Lost marker hint past SACKed? Tweak RFC3517 cnt */
if (!tcp_is_fack(tp) && (tp->lost_skb_hint != NULL) &&
before(TCP_SKB_CB(skb)->seq,
TCP_SKB_CB(tp->lost_skb_hint)->seq))
- tp->lost_cnt_hint += tcp_skb_pcount(skb);
+ tp->lost_cnt_hint += pcount;
if (fack_count > tp->fackets_out)
tp->fackets_out = fack_count;
@@ -1361,9 +1361,9 @@ static int tcp_sacktag_one(struct sk_buff *skb, struct sock *sk,
* frames and clear it. undo_retrans is decreased above, L|R frames
* are accounted above as well.
*/
- if (dup_sack && (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS)) {
- TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;
- tp->retrans_out -= tcp_skb_pcount(skb);
+ if (dup_sack && (*sackedto & TCPCB_SACKED_RETRANS)) {
+ *sackedto &= ~TCPCB_SACKED_RETRANS;
+ tp->retrans_out -= pcount;
}
return flag;
@@ -1403,7 +1403,9 @@ static struct sk_buff *tcp_sacktag_walk(struct sk_buff *skb, struct sock *sk,
if (in_sack)
*flag |= tcp_sacktag_one(skb, sk, reord, dup_sack,
- *fack_count);
+ *fack_count,
+ &(TCP_SKB_CB(skb)->sacked),
+ tcp_skb_pcount(skb));
*fack_count += tcp_skb_pcount(skb);
}
--
1.5.2.2
--
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