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Date: Wed, 28 Mar 2007 19:36:42 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH]: Pull out core sack tagging logic
Ok, this is what I was initially trying to do, pull out the
inner-most loop main code into a helper function.
Pushed to net-2.6.22
commit b096b50b4bf3c923bee28751d1ed41e92361a298
Author: David S. Miller <davem@...set.davemloft.net>
Date: Wed Mar 28 19:35:51 2007 -0700
[TCP]: Create tcp_sacktag_one().
Worker function that implements the main logic of
the inner-most loop of tcp_sacktag_write_queue().
Signed-off-by: David S. Miller <davem@...emloft.net>
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 464dc80..97b9be2 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -978,6 +978,115 @@ static int tcp_check_dsack(struct tcp_sock *tp, struct sk_buff *ack_skb,
return dup_sack;
}
+static void tcp_sacktag_one(struct sk_buff *skb, struct tcp_sock *tp,
+ struct tcp_sacktag_state *state, int in_sack,
+ int fack_count, u32 end_seq)
+{
+ u8 sacked = TCP_SKB_CB(skb)->sacked;
+
+ /* Account D-SACK for retransmitted packet. */
+ if ((state->dup_sack && in_sack) &&
+ (sacked & TCPCB_RETRANS) &&
+ after(TCP_SKB_CB(skb)->end_seq, tp->undo_marker))
+ tp->undo_retrans--;
+
+ /* The frame is ACKed. */
+ if (!after(TCP_SKB_CB(skb)->end_seq, tp->snd_una)) {
+ if (sacked & TCPCB_RETRANS) {
+ if ((state->dup_sack && in_sack) &&
+ (sacked & TCPCB_SACKED_ACKED))
+ state->reord = min(fack_count, state->reord);
+ } else {
+ /* If it was in a hole, we detected reordering. */
+ if (fack_count < state->prior_fackets &&
+ !(sacked & TCPCB_SACKED_ACKED))
+ state->reord = min(fack_count, state->reord);
+ }
+
+ /* Nothing to do; acked frame is about to be dropped. */
+ return;
+ }
+
+ if ((sacked & TCPCB_SACKED_RETRANS) &&
+ after(end_seq, TCP_SKB_CB(skb)->ack_seq) &&
+ (!state->lost_retrans || after(end_seq, state->lost_retrans)))
+ state->lost_retrans = end_seq;
+
+ if (!in_sack)
+ return;
+
+ if (!(sacked & TCPCB_SACKED_ACKED)) {
+ if (sacked & TCPCB_SACKED_RETRANS) {
+ /* If the segment is not tagged as lost,
+ * we do not clear RETRANS, believing
+ * 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);
+
+ /* clear lost hint */
+ tp->retransmit_skb_hint = NULL;
+ }
+ } else {
+ /* New sack for not retransmitted frame,
+ * which was in hole. It is reordering.
+ */
+ if (!(sacked & TCPCB_RETRANS) &&
+ fack_count < state->prior_fackets)
+ state->reord = min(fack_count, state->reord);
+
+ if (sacked & TCPCB_LOST) {
+ TCP_SKB_CB(skb)->sacked &= ~TCPCB_LOST;
+ tp->lost_out -= tcp_skb_pcount(skb);
+
+ /* clear lost hint */
+ tp->retransmit_skb_hint = NULL;
+ }
+ /* SACK enhanced F-RTO detection.
+ * Set flag if and only if non-rexmitted
+ * segments below frto_highmark are
+ * SACKed (RFC4138; Appendix B).
+ * Clearing correct due to in-order walk
+ */
+ if (after(end_seq, tp->frto_highmark)) {
+ state->flag &= ~FLAG_ONLY_ORIG_SACKED;
+ } else {
+ if (!(sacked & TCPCB_RETRANS))
+ state->flag |= FLAG_ONLY_ORIG_SACKED;
+ }
+ }
+
+ TCP_SKB_CB(skb)->sacked |= TCPCB_SACKED_ACKED;
+ state->flag |= FLAG_DATA_SACKED;
+ tp->sacked_out += tcp_skb_pcount(skb);
+
+ if (fack_count > tp->fackets_out)
+ tp->fackets_out = fack_count;
+
+ if (after(TCP_SKB_CB(skb)->seq,
+ tp->highest_sack))
+ tp->highest_sack = TCP_SKB_CB(skb)->seq;
+ } else {
+ if (state->dup_sack && (sacked&TCPCB_RETRANS))
+ state->reord = min(fack_count, state->reord);
+ }
+
+ /* D-SACK. We can detect redundant retransmission
+ * in S|R and plain R frames and clear it.
+ * undo_retrans is decreased above, L|R frames
+ * are accounted above as well.
+ */
+ if (state->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);
+ tp->retransmit_skb_hint = NULL;
+ }
+}
+
static int
tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb,
u32 prior_snd_una, u32 *mark_lost_entry_seq)
@@ -1090,7 +1199,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb,
tcp_for_write_queue_from(skb, sk) {
int in_sack, pcount;
- u8 sacked;
if (skb == tcp_send_head(sk))
break;
@@ -1133,108 +1241,8 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb,
fack_count += pcount;
- sacked = TCP_SKB_CB(skb)->sacked;
-
- /* Account D-SACK for retransmitted packet. */
- if ((state.dup_sack && in_sack) &&
- (sacked & TCPCB_RETRANS) &&
- after(TCP_SKB_CB(skb)->end_seq, tp->undo_marker))
- tp->undo_retrans--;
-
- /* The frame is ACKed. */
- if (!after(TCP_SKB_CB(skb)->end_seq, tp->snd_una)) {
- if (sacked&TCPCB_RETRANS) {
- if ((state.dup_sack && in_sack) &&
- (sacked&TCPCB_SACKED_ACKED))
- state.reord = min(fack_count, state.reord);
- } else {
- /* If it was in a hole, we detected reordering. */
- if (fack_count < state.prior_fackets &&
- !(sacked&TCPCB_SACKED_ACKED))
- state.reord = min(fack_count, state.reord);
- }
-
- /* Nothing to do; acked frame is about to be dropped. */
- continue;
- }
-
- if ((sacked&TCPCB_SACKED_RETRANS) &&
- after(end_seq, TCP_SKB_CB(skb)->ack_seq) &&
- (!state.lost_retrans || after(end_seq, state.lost_retrans)))
- state.lost_retrans = end_seq;
-
- if (!in_sack)
- continue;
-
- if (!(sacked&TCPCB_SACKED_ACKED)) {
- if (sacked & TCPCB_SACKED_RETRANS) {
- /* If the segment is not tagged as lost,
- * we do not clear RETRANS, believing
- * 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);
-
- /* clear lost hint */
- tp->retransmit_skb_hint = NULL;
- }
- } else {
- /* New sack for not retransmitted frame,
- * which was in hole. It is reordering.
- */
- if (!(sacked & TCPCB_RETRANS) &&
- fack_count < state.prior_fackets)
- state.reord = min(fack_count, state.reord);
-
- if (sacked & TCPCB_LOST) {
- TCP_SKB_CB(skb)->sacked &= ~TCPCB_LOST;
- tp->lost_out -= tcp_skb_pcount(skb);
-
- /* clear lost hint */
- tp->retransmit_skb_hint = NULL;
- }
- /* SACK enhanced F-RTO detection.
- * Set flag if and only if non-rexmitted
- * segments below frto_highmark are
- * SACKed (RFC4138; Appendix B).
- * Clearing correct due to in-order walk
- */
- if (after(end_seq, tp->frto_highmark)) {
- state.flag &= ~FLAG_ONLY_ORIG_SACKED;
- } else {
- if (!(sacked & TCPCB_RETRANS))
- state.flag |= FLAG_ONLY_ORIG_SACKED;
- }
- }
-
- TCP_SKB_CB(skb)->sacked |= TCPCB_SACKED_ACKED;
- state.flag |= FLAG_DATA_SACKED;
- tp->sacked_out += tcp_skb_pcount(skb);
-
- if (fack_count > tp->fackets_out)
- tp->fackets_out = fack_count;
-
- if (after(TCP_SKB_CB(skb)->seq,
- tp->highest_sack))
- tp->highest_sack = TCP_SKB_CB(skb)->seq;
- } else {
- if (state.dup_sack && (sacked&TCPCB_RETRANS))
- state.reord = min(fack_count, state.reord);
- }
-
- /* D-SACK. We can detect redundant retransmission
- * in S|R and plain R frames and clear it.
- * undo_retrans is decreased above, L|R frames
- * are accounted above as well.
- */
- if (state.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);
- tp->retransmit_skb_hint = NULL;
- }
+ tcp_sacktag_one(skb, tp, &state, in_sack,
+ fack_count, end_seq);
}
/* Prepare non-reno LOST marking fast path entry point, the
-
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