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authorVlad Yasevich <vladislav.yasevich@hp.com>2009-08-07 13:23:28 -0400
committerVlad Yasevich <vladislav.yasevich@hp.com>2009-09-04 18:20:56 -0400
commit5d7ff261ef497c62f54c39effc259910a28b313d (patch)
tree78eca9144bafc85c65cfdf19e5c8c5dffbd271f4
parente83963b769a2c38b436f5dcf82309f5cbc2f6012 (diff)
sctp: Try to encourage SACK bundling with DATA.
If the association has a SACK timer pending and now DATA queued to be send, we'll try to bundle the SACK with the next application send. As such, try encourage bundling by accounting for SACK in the size of the first chunk fragment. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
-rw-r--r--net/sctp/chunk.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index 9292294dbc12..7acaf15679b6 100644
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -207,14 +207,25 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
whole = 0;
first_len = max;
+ /* Check to see if we have a pending SACK and try to let it be bundled
+ * with this message. Do this if we don't have any data queued already.
+ * To check that, look at out_qlen and retransmit list.
+ * NOTE: we will not reduce to account for SACK, if the message would
+ * not have been fragmented.
+ */
+ if (timer_pending(&asoc->timers[SCTP_EVENT_TIMEOUT_SACK]) &&
+ asoc->outqueue.out_qlen == 0 &&
+ list_empty(&asoc->outqueue.retransmit) &&
+ msg_len > max)
+ max_data -= WORD_ROUND(sizeof(sctp_sack_chunk_t));
+
/* Encourage Cookie-ECHO bundling. */
- if (asoc->state < SCTP_STATE_COOKIE_ECHOED) {
+ if (asoc->state < SCTP_STATE_COOKIE_ECHOED)
max_data -= SCTP_ARBITRARY_COOKIE_ECHO_LEN;
- /* This is the biggesr first_len we can have */
- if (first_len > max_data)
- first_len = max_data;
- }
+ /* Now that we adjusted completely, reset first_len */
+ if (first_len > max_data)
+ first_len = max_data;
/* Account for a different sized first fragment */
if (msg_len >= first_len) {