netdev - Re: [PATCH net-next v1 5/9] bonding: convert bond_has_this

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Date:	Mon, 26 Aug 2013 22:53:38 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Veaceslav Falico <vfalico@...hat.com>
Cc:	netdev@...r.kernel.org, Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH net-next v1 5/9] bonding: convert bond_has_this_ip() to
 use upper devices

Mon, Aug 26, 2013 at 10:32:38PM CEST, vfalico@...hat.com wrote:
>Currently, bond_has_this_ip() is aware only of vlan upper devices, and thus
>will return false if the address is associated with the upper bridge or any
>other device, and thus will break the arp logic.
>
>Fix this by using the upper device list. For every upper device we verify
>if the address associated with it is our address, and if yes - return true.
>
>v1: use netdev_for_each_upper_dev()
>
>CC: Jay Vosburgh <fubar@...ibm.com>
>CC: Andy Gospodarek <andy@...yhouse.net>
>Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
>---
> drivers/net/bonding/bond_main.c |   25 +++++++++++++------------
> 1 files changed, 13 insertions(+), 12 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 40eb250..dbac1ce 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -2392,24 +2392,25 @@ re_arm:
> 	}
> }
> 
>-static int bond_has_this_ip(struct bonding *bond, __be32 ip)
>+static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
> {
>-	struct vlan_entry *vlan;
>-	struct net_device *vlan_dev;
>+	struct net_device *upper;
>+	struct list_head *iter;
>+	bool ret = false;
> 
> 	if (ip == bond_confirm_addr(bond->dev, 0, ip))
>-		return 1;
>+		return true;
> 
>-	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
>-		rcu_read_lock();
>-		vlan_dev = __vlan_find_dev_deep(bond->dev, htons(ETH_P_8021Q),
>-						vlan->vlan_id);
>-		rcu_read_unlock();
>-		if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
>-			return 1;
>+	rcu_read_lock();
>+	netdev_for_each_upper_dev(bond->dev, upper, iter) {
>+		if (ip == bond_confirm_addr(upper, 0, ip)) {
>+			ret = true;
>+			break;
>+		}

You need the same recursion __vlan_find_dev_deep() is doing. If you do
not do that, you will miss anything over the first upper level.


> 	}
>+	rcu_read_unlock();
> 
>-	return 0;
>+	return ret;
> }
> 
> /*
>-- 
>1.7.1
>
>--
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