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SCTP: Use hashed lookup when looking for an association.

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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>
This commit is contained in:
Vlad Yasevich 2007-11-09 11:41:36 -05:00
parent 027f6e1ad3
commit 123ed979ea
1 changed files with 25 additions and 15 deletions
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40
net/sctp/endpointola.c
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@ -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;
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;
}
}
*transport = NULL;
return NULL;
rport = ntohs(paddr->v4.sin_port);
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;
}
read_unlock(&head->lock);
return asoc;
}
/* Lookup association on an endpoint based on a peer address. BH-safe. */