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sctp: Restore 'resent' bit to avoid retransmitted chunks for RTT measurements

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Currently retransmitted DATA chunks could also be used for
RTT measurements since there are no flag to identify whether
the transmitted DATA chunk is a new one or a retransmitted one.
This problem is introduced by commit ae19c5486 ("sctp: remove
'resent' bit from the chunk") which inappropriately removed the
'resent' bit completely, instead of doing this, we should set
the resent bit only for the retransmitted DATA chunks.

Signed-off-by: Xufeng Zhang <xufeng.zhang@windriver.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xufeng Zhang 2013-11-25 11:26:57 +08:00 committed by David S. Miller
parent 5e53e689b7
commit 6eabca54d6
3 changed files with 6 additions and 1 deletions
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1
include/net/sctp/structs.h
View File

@ -629,6 +629,7 @@ struct sctp_chunk {
#define SCTP_NEED_FRTX 0x1
#define SCTP_DONT_FRTX 0x2
__u16 rtt_in_progress:1, /* This chunk used for RTT calc? */
resent:1, /* Has this chunk ever been resent. */
has_tsn:1, /* Does this chunk have a TSN yet? */
has_ssn:1, /* Does this chunk have a SSN yet? */
singleton:1, /* Only chunk in the packet? */

3
net/sctp/output.c
View File

@ -474,10 +474,11 @@ int sctp_packet_transmit(struct sctp_packet *packet)
* for a given destination transport address.
*/
if (!tp->rto_pending) {
if (!chunk->resent && !tp->rto_pending) {
chunk->rtt_in_progress = 1;
tp->rto_pending = 1;
}
has_data = 1;
}

3
net/sctp/outqueue.c
View File

@ -446,6 +446,8 @@ void sctp_retransmit_mark(struct sctp_outq *q,
transport->rto_pending = 0;
}
chunk->resent = 1;
/* Move the chunk to the retransmit queue. The chunks
* on the retransmit queue are always kept in order.
*/
@ -1375,6 +1377,7 @@ static void sctp_check_transmitted(struct sctp_outq *q,
* instance).
*/
if (!tchunk->tsn_gap_acked &&
!tchunk->resent &&
tchunk->rtt_in_progress) {
tchunk->rtt_in_progress = 0;
rtt = jiffies - tchunk->sent_at;