2013-10-16 07:22:43

by Chang Xiangzhong

Subject: [PATCH v3] net: sctp: fix a cacc_saw_newack missetting issue

For for each TSN t being newly acked (Not only cumulatively,
but also SELECTIVELY) cacc_saw_newack should be set to 1.

Signed-off-by: Xiangzhong Chang <[email protected]>
---
net/sctp/outqueue.c | 53 ++++++++++++++++++++++++---------------------------
1 file changed, 25 insertions(+), 28 deletions(-)

diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 94df758..da9a778 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -1383,19 +1383,38 @@ static void sctp_check_transmitted(struct sctp_outq *q,
}
}

- /* If the chunk hasn't been marked as ACKED,
- * mark it and account bytes_acked if the
- * chunk had a valid transport (it will not
- * have a transport if ASCONF had deleted it
- * while DATA was outstanding).
- */
if (!tchunk->tsn_gap_acked) {
+ /* If the chunk hasn't been marked as ACKED,
+ * mark it and account bytes_acked if the
+ * chunk had a valid transport (it will not
+ * have a transport if ASCONF had deleted it
+ * while DATA was outstanding).
+ */
tchunk->tsn_gap_acked = 1;
*highest_new_tsn_in_sack = tsn;
bytes_acked += sctp_data_size(tchunk);
if (!tchunk->transport)
migrate_bytes += sctp_data_size(tchunk);
forward_progress = true;
+
+ /*
+ * SFR-CACC algorithm:
+ * 2) If the SACK contains gap acks
+ * and the flag CHANGEOVER_ACTIVE is
+ * set the receiver of the SACK MUST
+ * take the following action:
+ *
+ * B) For each TSN t being acked that
+ * has not been acked in any SACK so
+ * far, set cacc_saw_newack to 1 for
+ * the destination that the TSN was
+ * sent to.
+ */
+ if (transport &&
+ sack->num_gap_ack_blocks &&
+ q->asoc->peer.primary_path->cacc.
+ changeover_active)
+ transport->cacc.cacc_saw_newack = 1;
}

if (TSN_lte(tsn, sack_ctsn)) {
@@ -1411,28 +1430,6 @@ static void sctp_check_transmitted(struct sctp_outq *q,
restart_timer = 1;
forward_progress = true;

- if (!tchunk->tsn_gap_acked) {
- /*
- * SFR-CACC algorithm:
- * 2) If the SACK contains gap acks
- * and the flag CHANGEOVER_ACTIVE is
- * set the receiver of the SACK MUST
- * take the following action:
- *
- * B) For each TSN t being acked that
- * has not been acked in any SACK so
- * far, set cacc_saw_newack to 1 for
- * the destination that the TSN was
- * sent to.
- */
- if (transport &&
- sack->num_gap_ack_blocks &&
- q->asoc->peer.primary_path->cacc.
- changeover_active)
- transport->cacc.cacc_saw_newack
- = 1;
- }
-
list_add_tail(&tchunk->transmitted_list,
&q->sacked);
} else {
--
1.7.9.5

2013-10-19 22:52:05

by David Miller

Subject: Re: [PATCH v3] net: sctp: fix a cacc_saw_newack missetting issue

From: Chang Xiangzhong <[email protected]>
Date: Wed, 16 Oct 2013 09:22:11 +0200

> For for each TSN t being newly acked (Not only cumulatively,
> but also SELECTIVELY) cacc_saw_newack should be set to 1.
>
> Signed-off-by: Xiangzhong Chang <[email protected]>

SCTP folks, can you please review this patch?

Thanks.