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sctp: Only mark chunks as missing when there are gaps 

Frist small step in optimizing SACK processing.   Do not call
sctp_mark_missing() when there are no gaps reported and thus
not missing chunks.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
This commit is contained in:
Vlad Yasevich 2008-06-19 17:59:13 -04:00
parent bcd41303f4
commit 2cd9b822bf
1 changed files with 12 additions and 9 deletions
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21
net/sctp/outqueue.c
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@ -1129,12 +1129,13 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
unsigned outstanding; unsigned outstanding;
struct sctp_transport *primary = asoc->peer.primary_path; struct sctp_transport *primary = asoc->peer.primary_path;
int count_of_newacks = 0; int count_of_newacks = 0;
int gap_ack_blocks;
/* Grab the association's destination address list. */ /* Grab the association's destination address list. */
transport_list = &asoc->peer.transport_addr_list; transport_list = &asoc->peer.transport_addr_list;
sack_ctsn = ntohl(sack->cum_tsn_ack); sack_ctsn = ntohl(sack->cum_tsn_ack);
gap_ack_blocks = ntohs(sack->num_gap_ack_blocks);
/* /*
* SFR-CACC algorithm: * SFR-CACC algorithm:
* On receipt of a SACK the sender SHOULD execute the * On receipt of a SACK the sender SHOULD execute the
@ -1161,7 +1162,7 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
* A) Initialize the cacc_saw_newack to 0 for all destination * A) Initialize the cacc_saw_newack to 0 for all destination
* addresses. * addresses.
*/ */
if (sack->num_gap_ack_blocks && if (gap_ack_blocks &&
primary->cacc.changeover_active) { primary->cacc.changeover_active) {
list_for_each_entry(transport, transport_list, transports) { list_for_each_entry(transport, transport_list, transports) {
transport->cacc.cacc_saw_newack = 0; transport->cacc.cacc_saw_newack = 0;
@ -1170,9 +1171,8 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
/* Get the highest TSN in the sack. */ /* Get the highest TSN in the sack. */
highest_tsn = sack_ctsn; highest_tsn = sack_ctsn;
if (sack->num_gap_ack_blocks) if (gap_ack_blocks)
highest_tsn += highest_tsn += ntohs(frags[gap_ack_blocks - 1].gab.end);
ntohs(frags[ntohs(sack->num_gap_ack_blocks) - 1].gab.end);
if (TSN_lt(asoc->highest_sacked, highest_tsn)) { if (TSN_lt(asoc->highest_sacked, highest_tsn)) {
highest_new_tsn = highest_tsn; highest_new_tsn = highest_tsn;
@ -1181,11 +1181,11 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
highest_new_tsn = sctp_highest_new_tsn(sack, asoc); highest_new_tsn = sctp_highest_new_tsn(sack, asoc);
} }
/* Run through the retransmit queue. Credit bytes received /* Run through the retransmit queue. Credit bytes received
* and free those chunks that we can. * and free those chunks that we can.
*/ */
sctp_check_transmitted(q, &q->retransmit, NULL, sack, highest_new_tsn); sctp_check_transmitted(q, &q->retransmit, NULL, sack, highest_new_tsn);
sctp_mark_missing(q, &q->retransmit, NULL, highest_new_tsn, 0);
/* Run through the transmitted queue. /* Run through the transmitted queue.
* Credit bytes received and free those chunks which we can. * Credit bytes received and free those chunks which we can.
@ -1204,9 +1204,12 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack)
count_of_newacks ++; count_of_newacks ++;
} }
list_for_each_entry(transport, transport_list, transports) { if (gap_ack_blocks) {
sctp_mark_missing(q, &transport->transmitted, transport, sctp_mark_missing(q, &q->retransmit, NULL, highest_new_tsn, 0);
highest_new_tsn, count_of_newacks);
list_for_each_entry(transport, transport_list, transports)
sctp_mark_missing(q, &transport->transmitted, transport,
highest_new_tsn, count_of_newacks);
} }
/* Move the Cumulative TSN Ack Point if appropriate. */ /* Move the Cumulative TSN Ack Point if appropriate. */