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Message-Id: <20241107161323.2921985-1-gnaaman@drivenets.com>
Date: Thu, 7 Nov 2024 16:13:23 +0000
From: Gilad Naaman <gnaaman@...venets.com>
To: "David S. Miller" <davem@...emloft.net>,
David Ahern <dsahern@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Simon Horman <horms@...nel.org>,
netdev@...r.kernel.org
Cc: Gilad Naaman <gnaaman@...venets.com>
Subject: [PATCH net-next] Avoid traversing addrconf hash on ifdown
struct inet6_dev already has a list of addresses owned by the device,
enabling us to traverse this much shorter list, instead of scanning
the entire hash-table.
Signed-off-by: Gilad Naaman <gnaaman@...venets.com>
---
net/ipv6/addrconf.c | 36 ++++++++++++++++--------------------
1 file changed, 16 insertions(+), 20 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index d0a99710d65d..9c57c993e1ec 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3846,12 +3846,12 @@ static int addrconf_ifdown(struct net_device *dev, bool unregister)
{
unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
struct net *net = dev_net(dev);
- struct inet6_dev *idev;
struct inet6_ifaddr *ifa;
LIST_HEAD(tmp_addr_list);
+ struct inet6_dev *idev;
bool keep_addr = false;
bool was_ready;
- int state, i;
+ int state;
ASSERT_RTNL();
@@ -3890,28 +3890,24 @@ static int addrconf_ifdown(struct net_device *dev, bool unregister)
}
/* Step 2: clear hash table */
- for (i = 0; i < IN6_ADDR_HSIZE; i++) {
- struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
+ read_lock_bh(&idev->lock);
+ spin_lock_bh(&net->ipv6.addrconf_hash_lock);
- spin_lock_bh(&net->ipv6.addrconf_hash_lock);
-restart:
- hlist_for_each_entry_rcu(ifa, h, addr_lst) {
- if (ifa->idev == idev) {
- addrconf_del_dad_work(ifa);
- /* combined flag + permanent flag decide if
- * address is retained on a down event
- */
- if (!keep_addr ||
- !(ifa->flags & IFA_F_PERMANENT) ||
- addr_is_local(&ifa->addr)) {
- hlist_del_init_rcu(&ifa->addr_lst);
- goto restart;
- }
- }
+ list_for_each_entry(ifa, &idev->addr_list, if_list) {
+ addrconf_del_dad_work(ifa);
+ /* combined flag + permanent flag decide if
+ * address is retained on a down event
+ */
+ if (!keep_addr ||
+ !(ifa->flags & IFA_F_PERMANENT) ||
+ addr_is_local(&ifa->addr)) {
+ hlist_del_init_rcu(&ifa->addr_lst);
}
- spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
}
+ spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
+ read_unlock_bh(&idev->lock);
+
write_lock_bh(&idev->lock);
addrconf_del_rs_timer(idev);
--
2.34.1
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