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SubjectRe: [PATCH] net: sctp: fix a cacc_saw_newack missetting issue
On 10/14/2013 09:33 AM, Chang Xiangzhong wrote:
> 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 <changxiangzhong@gmail.com>
> ---
> net/sctp/outqueue.c | 42 +++++++++++++++++++++---------------------
> 1 file changed, 21 insertions(+), 21 deletions(-)
>
> diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
> index 94df758..d86032b 100644
> --- a/net/sctp/outqueue.c
> +++ b/net/sctp/outqueue.c
> @@ -1398,6 +1398,27 @@ static void sctp_check_transmitted(struct sctp_outq *q,
> forward_progress = true;
> }
>
> + if (!tchunk->tsn_gap_acked) {

You can remove this test since the block just above already performs
it. Just fold this code into the block above.

-vlad

> + /*
> + * 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)) {
> /* RFC 2960 6.3.2 Retransmission Timer Rules
> *
> @@ -1411,27 +1432,6 @@ 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);
>



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