netdev - Re: [net-next, v2, 1/2] bonding: change the bond's vlan syncing functions with the standard ones

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Date:	Tue, 6 Aug 2013 14:11:15 +0200
From:	Veaceslav Falico <vfalico@...hat.com>
To:	nikolay@...hat.com
Cc:	netdev@...r.kernel.org, andy@...yhouse.net, fubar@...ibm.com,
	davem@...emloft.net
Subject: Re: [net-next, v2, 1/2] bonding: change the bond's vlan syncing
 functions with the standard ones

On Tue, Aug 06, 2013 at 12:40:15PM +0200, nikolay@...hat.com wrote:
>From: Nikolay Aleksandrov <Nikolay Aleksandrov nikolay@...hat.com>
>
>Now we have vlan_vids_add/del_by_dev() which serve the same purpose as
>bond's bond_add/del_vlans_on_slave() with the good side effect of
>reverting the changes if one of the additions fails.
>There's only 1 change in the behaviour of enslave: if adding of the
>vlans to the slave fails, we'll fail the enslaving because otherwise we
>might delete some vlan that wasn't added by the bonding.
>The only way this may happen is with ENOMEM currently, so we're in trouble
>anyway.
>
>Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>

Acked-by: Veaceslav Falico <vfalico@...hat.com>

>
>---
>v2: Fail enslavement with an error message if syncing of vlans fails
>because otherwise we might delete vlans that weren't added by us.
>
> drivers/net/bonding/bond_main.c | 37 +++++++------------------------------
> 1 file changed, 7 insertions(+), 30 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 5697043..78b0aeb 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -493,33 +493,6 @@ static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
> 	return 0;
> }
>
>-static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
>-{
>-	struct vlan_entry *vlan;
>-	int res;
>-
>-	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
>-		res = vlan_vid_add(slave_dev, htons(ETH_P_8021Q),
>-				   vlan->vlan_id);
>-		if (res)
>-			pr_warning("%s: Failed to add vlan id %d to device %s\n",
>-				   bond->dev->name, vlan->vlan_id,
>-				   slave_dev->name);
>-	}
>-}
>-
>-static void bond_del_vlans_from_slave(struct bonding *bond,
>-				      struct net_device *slave_dev)
>-{
>-	struct vlan_entry *vlan;
>-
>-	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
>-		if (!vlan->vlan_id)
>-			continue;
>-		vlan_vid_del(slave_dev, htons(ETH_P_8021Q), vlan->vlan_id);
>-	}
>-}
>-
> /*------------------------------- Link status -------------------------------*/
>
> /*
>@@ -1630,7 +1603,11 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> 		dev_mc_add(slave_dev, lacpdu_multicast);
> 	}
>
>-	bond_add_vlans_on_slave(bond, slave_dev);
>+	if (vlan_vids_add_by_dev(slave_dev, bond_dev)) {
>+		pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
>+		       bond_dev->name, slave_dev->name);
>+		goto err_close;
>+	}
>
> 	write_lock_bh(&bond->lock);
>
>@@ -1806,7 +1783,7 @@ err_detach:
> 	if (!USES_PRIMARY(bond->params.mode))
> 		bond_hw_addr_flush(bond_dev, slave_dev);
>
>-	bond_del_vlans_from_slave(bond, slave_dev);
>+	vlan_vids_del_by_dev(slave_dev, bond_dev);
> 	write_lock_bh(&bond->lock);
> 	bond_detach_slave(bond, new_slave);
> 	if (bond->primary_slave == new_slave)
>@@ -2002,7 +1979,7 @@ static int __bond_release_one(struct net_device *bond_dev,
> 	/* must do this from outside any spinlocks */
> 	bond_destroy_slave_symlinks(bond_dev, slave_dev);
>
>-	bond_del_vlans_from_slave(bond, slave_dev);
>+	vlan_vids_del_by_dev(slave_dev, bond_dev);
>
> 	/* If the mode USES_PRIMARY, then this cases was handled above by
> 	 * bond_change_active_slave(..., NULL)
--
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