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Date: Tue, 15 Oct 2013 19:39:35 +0200
From: Chang <changxiangzhong@...il.com>
To: Vlad Yasevich <vyasevich@...il.com>
CC: nhorman@...driver.com, davem@...emloft.net,
linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] For for each TSN t being newly acked (Not only cumulatively,
but also SELECTIVELY) cacc_saw_newack should be set to 1.
On 10/15/2013 07:25 PM, Vlad Yasevich wrote:
> On 10/15/2013 12:59 PM, Chang Xiangzhong wrote:
>> Signed-off-by: Xiangzhong Chang <changxiangzhong@...il.com>
>> ---
>> net/sctp/outqueue.c | 142
>> ++++++++++++++++++++++++---------------------------
>> 1 file changed, 68 insertions(+), 74 deletions(-)
>>
>> diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
>> index 94df758..f10d848 100644
>> --- a/net/sctp/outqueue.c
>> +++ b/net/sctp/outqueue.c
>> @@ -1357,84 +1357,78 @@ static void sctp_check_transmitted(struct
>> sctp_outq *q,
>>
>> tsn = ntohl(tchunk->subh.data_hdr->tsn);
>> if (sctp_acked(sack, tsn)) {
>> - /* If this queue is the retransmit queue, the
>> - * retransmit timer has already reclaimed
>> - * the outstanding bytes for this chunk, so only
>> - * count bytes associated with a transport.
>> - */
>> - if (transport) {
>> - /* If this chunk is being used for RTT
>> - * measurement, calculate the RTT and update
>> - * the RTO using this value.
>> - *
>> - * 6.3.1 C5) Karn's algorithm: RTT measurements
>> - * MUST NOT be made using packets that were
>> - * retransmitted (and thus for which it is
>> - * ambiguous whether the reply was for the
>> - * first instance of the packet or a later
>> - * instance).
>> - */
>> - if (!tchunk->tsn_gap_acked &&
>> - tchunk->rtt_in_progress) {
>> - tchunk->rtt_in_progress = 0;
>> - rtt = jiffies - tchunk->sent_at;
>> - sctp_transport_update_rto(transport,
>> - rtt);
>> - }
>> - }
>> -
>> - /* 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) {
>> - 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;
>> + /* If this queue is the retransmit queue, the
>> + * retransmit timer has already reclaimed
>> + * the outstanding bytes for this chunk, so only
>> + * count bytes associated with a transport.
>> + *
>> + * If this chunk is being used for RTT
>> + * measurement, calculate the RTT and update
>> + * the RTO using this value.
>> + *
>> + * 6.3.1 C5) Karn's algorithm: RTT measurements
>> + * MUST NOT be made using packets that were
>> + * retransmitted (and thus for which it is
>> + * ambiguous whether the reply was for the
>> + * first instance of the packet or a later
>> + * instance).
>> + */
>> + if (transport && tchunk->rtt_in_progress) {
>> + tchunk->rtt_in_progress = 0;
>> + rtt = jiffies - tchunk->sent_at;
>> + sctp_transport_update_rto(transport,
>> + rtt);
>> + }
>> +
>> + /* 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;
>> }
>
> Indents should be tab based.
> This is a bit more of a re-write that is needed for the this
> particualar patch. What's wrong with just doing this?
>
I'm pretty new of kernel dev. So I've make a new patch. What's the
correct way of doing this? just attach the new patch to this email?
-Chang
> @@ -1396,6 +1396,25 @@ static void sctp_check_transmitted(struct
> sctp_outq *q,
> 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)) {
>
> -vlad
>
>>
>> if (TSN_lte(tsn, sack_ctsn)) {
>> - /* RFC 2960 6.3.2 Retransmission Timer Rules
>> - *
>> - * R3) Whenever a SACK is received
>> - * that acknowledges the DATA chunk
>> - * with the earliest outstanding TSN
>> - * for that address, restart T3-rtx
>> - * timer for that address with its
>> - * current RTO.
>> - */
>> - 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);
>> + /* RFC 2960 6.3.2 Retransmission Timer Rules
>> + *
>> + * R3) Whenever a SACK is received
>> + * that acknowledges the DATA chunk
>> + * with the earliest outstanding TSN
>> + * for that address, restart T3-rtx
>> + * timer for that address with its
>> + * current RTO.
>> + */
>> + restart_timer = 1;
>> + forward_progress = true;
>> +
>> + list_add_tail(&tchunk->transmitted_list,
>> + &q->sacked);
>> } else {
>> /* RFC2960 7.2.4, sctpimpguide-05 2.8.2
>> * M2) Each time a SACK arrives reporting
>>
>
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