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[SCTP]: Send only 1 window update SACK per message.

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Right now, every time we increase our rwnd by more then MTU bytes, we
trigger a SACK.  When processing large messages, this will generate a
SACK for almost every other SCTP fragment. However since we are freeing
the entire message at the same time, we might as well collapse the SACK
generation to 1.

Signed-off-by: Tsutomu Fujii <t-fujii@nb.jp.nec.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tsutomu Fujii 2006-06-17 22:58:28 -07:00 committed by David S. Miller
parent 503b55fd77
commit d7c2c9e397
1 changed files with 28 additions and 2 deletions
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30
net/sctp/ulpevent.c
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@ -51,6 +51,8 @@
static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
struct sctp_association *asoc);
static void sctp_ulpevent_release_data(struct sctp_ulpevent *event);
static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event);
/* Initialize an ULP event from an given skb. */
SCTP_STATIC void sctp_ulpevent_init(struct sctp_ulpevent *event, int msg_flags)
@ -883,6 +885,7 @@ static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
{
struct sk_buff *skb, *frag;
unsigned int len;
/* Current stack structures assume that the rcv buffer is
* per socket. For UDP style sockets this is not true as
@ -892,7 +895,7 @@ static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
*/
skb = sctp_event2skb(event);
sctp_assoc_rwnd_increase(event->asoc, skb_headlen(skb));
len = skb->len;
if (!skb->data_len)
goto done;
@ -903,7 +906,30 @@ static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
* skb's with only 1 level of fragments, SCTP reassembly can
* increase the levels.
*/
sctp_ulpevent_release_data(sctp_skb2event(frag));
sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
}
done:
sctp_assoc_rwnd_increase(event->asoc, len);
sctp_ulpevent_release_owner(event);
}
static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
{
struct sk_buff *skb, *frag;
skb = sctp_event2skb(event);
if (!skb->data_len)
goto done;
/* Don't forget the fragments. */
for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
/* NOTE: skb_shinfos are recursive. Although IP returns
* skb's with only 1 level of fragments, SCTP reassembly can
* increase the levels.
*/
sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
}
done: