diff mbox

[net-next] ipv6: optimize link local address search

Message ID 20140119205819.GD16462@order.stressinduktion.org
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Hannes Frederic Sowa Jan. 19, 2014, 8:58 p.m. UTC 
ipv6_link_dev_addr sorts newly added addresses by scope in
ifp->addr_list. Smaller scope addresses are added to the tail of the
list. Use this fact to iterate in reverse over addr_list and break out
as soon as a higher scoped one showes up, so we can spare some cycles
on machines with lot's of addresses.

The ordering of the addresses is not relevant and we are more likely to
get the eui64 generated address with this change anyway.

Suggested-by: Brian Haley <brian.haley@hp.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
---
 net/ipv6/addrconf.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

Comments

David Miller Jan. 20, 2014, 3:56 a.m. UTC | #1 
From: Hannes Frederic Sowa <hannes@stressinduktion.org>
Date: Sun, 19 Jan 2014 21:58:19 +0100

> ipv6_link_dev_addr sorts newly added addresses by scope in
> ifp->addr_list. Smaller scope addresses are added to the tail of the
> list. Use this fact to iterate in reverse over addr_list and break out
> as soon as a higher scoped one showes up, so we can spare some cycles
> on machines with lot's of addresses.
> 
> The ordering of the addresses is not relevant and we are more likely to
> get the eui64 generated address with this change anyway.
> 
> Suggested-by: Brian Haley <brian.haley@hp.com>
> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>

Applied.
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diff mbox

Patch

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index f91e107..31bdedc 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1437,7 +1437,9 @@  int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
 	struct inet6_ifaddr *ifp;
 	int err = -EADDRNOTAVAIL;
 
-	list_for_each_entry(ifp, &idev->addr_list, if_list) {
+	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
+		if (ifp->scope > IFA_LINK)
+			break;
 		if (ifp->scope == IFA_LINK &&
 		    !(ifp->flags & banned_flags)) {
 			*addr = ifp->addr;
@@ -1858,7 +1860,9 @@  static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
 	struct inet6_ifaddr *ifp;
 
 	read_lock_bh(&idev->lock);
-	list_for_each_entry(ifp, &idev->addr_list, if_list) {
+	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
+		if (ifp->scope > IFA_LINK)
+			break;
 		if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
 			memcpy(eui, ifp->addr.s6_addr+8, 8);
 			err = 0;
@@ -3239,7 +3243,9 @@  static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
 	struct inet6_ifaddr *ifpiter;
 	struct inet6_dev *idev = ifp->idev;
 
-	list_for_each_entry(ifpiter, &idev->addr_list, if_list) {
+	list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
+		if (ifpiter->scope > IFA_LINK)
+			break;
 		if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
 		    (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
 				       IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==