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authorVlad Yasevich <vladislav.yasevich@hp.com>2007-11-09 11:41:36 -0500
committerVlad Yasevich <vladislav.yasevich@hp.com>2007-11-09 11:41:36 -0500
commit123ed979eaa8de0dd2422862d247469eda0bd645 (patch)
tree745e6ff660cc401dd32e684f3651920e42150211
parent027f6e1ad32de32f9fe1c61d0f744e329e8acfd9 (diff)
SCTP: Use hashed lookup when looking for an association.
A SCTP endpoint may have a lot of associations on them and walking the list is fairly inefficient. Instead, use a hashed lookup, and filter out the hash list based on the endopoing we already have. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
-rw-r--r--net/sctp/endpointola.c34
1 files changed, 22 insertions, 12 deletions
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index 2d2d81ef4a6..68f0556efcc 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -328,24 +328,34 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
const union sctp_addr *paddr,
struct sctp_transport **transport)
{
+ struct sctp_association *asoc = NULL;
+ struct sctp_transport *t = NULL;
+ struct sctp_hashbucket *head;
+ struct sctp_ep_common *epb;
+ int hash;
int rport;
- struct sctp_association *asoc;
- struct list_head *pos;
+ *transport = NULL;
rport = ntohs(paddr->v4.sin_port);
- list_for_each(pos, &ep->asocs) {
- asoc = list_entry(pos, struct sctp_association, asocs);
- if (rport == asoc->peer.port) {
- *transport = sctp_assoc_lookup_paddr(asoc, paddr);
-
- if (*transport)
- return asoc;
+ hash = sctp_assoc_hashfn(ep->base.bind_addr.port, rport);
+ head = &sctp_assoc_hashtable[hash];
+ read_lock(&head->lock);
+ for (epb = head->chain; epb; epb = epb->next) {
+ asoc = sctp_assoc(epb);
+ if (asoc->ep != ep || rport != asoc->peer.port)
+ goto next;
+
+ t = sctp_assoc_lookup_paddr(asoc, paddr);
+ if (t) {
+ *transport = t;
+ break;
}
+next:
+ asoc = NULL;
}
-
- *transport = NULL;
- return NULL;
+ read_unlock(&head->lock);
+ return asoc;
}
/* Lookup association on an endpoint based on a peer address. BH-safe. */