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| author | Vlad Yasevich <vladislav.yasevich@hp.com> | 2008-06-19 17:59:13 -0400 |
|---|---|---|
| committer | Vlad Yasevich <vladislav.yasevich@hp.com> | 2008-10-01 11:33:06 -0400 |
| commit | 2cd9b822bfa79fc1335d3e71a0449f3cd0b5078e (patch) | |
| tree | 830f284cbc2f3be60e80705764f6dd6e84511188 /net/sctp/outqueue.c | |
| parent | bcd41303f422015ab662c9276d108414aa75b796 (diff) | |
| download | lwn-2cd9b822bfa79fc1335d3e71a0449f3cd0b5078e.tar.gz lwn-2cd9b822bfa79fc1335d3e71a0449f3cd0b5078e.zip | |
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>
Diffstat (limited to 'net/sctp/outqueue.c')
| -rw-r--r-- | net/sctp/outqueue.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c index 4328ad5439c9..ef5ea7423cc8 100644 --- a/net/sctp/outqueue.c +++ b/net/sctp/outqueue.c @@ -1129,12 +1129,13 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_sackhdr *sack) unsigned outstanding; struct sctp_transport *primary = asoc->peer.primary_path; int count_of_newacks = 0; + int gap_ack_blocks; /* Grab the association's destination address list. */ transport_list = &asoc->peer.transport_addr_list; sack_ctsn = ntohl(sack->cum_tsn_ack); - + gap_ack_blocks = ntohs(sack->num_gap_ack_blocks); /* * SFR-CACC algorithm: * 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 * addresses. */ - if (sack->num_gap_ack_blocks && + if (gap_ack_blocks && primary->cacc.changeover_active) { list_for_each_entry(transport, transport_list, transports) { 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. */ highest_tsn = sack_ctsn; - if (sack->num_gap_ack_blocks) - highest_tsn += - ntohs(frags[ntohs(sack->num_gap_ack_blocks) - 1].gab.end); + if (gap_ack_blocks) + highest_tsn += ntohs(frags[gap_ack_blocks - 1].gab.end); if (TSN_lt(asoc->highest_sacked, 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); } + /* Run through the retransmit queue. Credit bytes received * and free those chunks that we can. */ 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. * 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 ++; } - list_for_each_entry(transport, transport_list, transports) { - sctp_mark_missing(q, &transport->transmitted, transport, - highest_new_tsn, count_of_newacks); + if (gap_ack_blocks) { + sctp_mark_missing(q, &q->retransmit, NULL, highest_new_tsn, 0); + + 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. */ |