From d7c2c9e3977e4312d093ac092761798d4d47c9e0 Mon Sep 17 00:00:00 2001 From: Tsutomu Fujii Date: Sat, 17 Jun 2006 22:58:28 -0700 Subject: [PATCH] [SCTP]: Send only 1 window update SACK per message. 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 Signed-off-by: Vlad Yasevich Signed-off-by: Sridhar Samudrala Signed-off-by: David S. Miller --- net/sctp/ulpevent.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c index ba97f974f5..ee236784a6 100644 --- a/net/sctp/ulpevent.c +++ b/net/sctp/ulpevent.c @@ -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 +895,30 @@ 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; + + /* 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: + 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; @@ -903,7 +929,7 @@ 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: -- 2.39.5