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Message-ID: <20130805215126.GB3859@redhat.com>
Date: Mon, 5 Aug 2013 23:51:26 +0200
From: Veaceslav Falico <vfalico@...hat.com>
To: nikolay@...hat.com
Cc: netdev@...r.kernel.org, fubar@...ibm.com, andy@...yhouse.net,
davem@...emloft.net, kaber@...sh.net
Subject: Re: [net-next,1/3] bonding: fix vlan 0 addition and removal
On Mon, Aug 05, 2013 at 03:28:22PM +0200, nikolay@...hat.com wrote:
...snip...
>This is fixed by forbidding the addition/removal of vlan 0 through the
>bond's ndo_vlan_rx_add/kill_vid functions, and adding/removing it only when
>vlan 0 is in fact being created (or destroyed) on top of a bond interface
>in the bond's netdev handling function.
Isn't that a bit too intrusive/hacky? I don't think we should treat vlan id
0 somehow differently in terms of adding/removing, though I might be
wrong...
Maybe we should just fix the bond_vlan_used() function? Something like
this (I've done only basic testing, can do more thorough if needed), though
it's also not a really clean fix:
>From 1c89abefebe90568ed52d2df59fcfdd650bc4696 Mon Sep 17 00:00:00 2001
From: Veaceslav Falico <vfalico@...hat.com>
Date: Mon, 5 Aug 2013 23:29:12 +0200
Subject: [PATCH] bonding: add vlan_uses_dev_rcu() and make bond_vlan_used() use it
Currently, bond_vlan_used() looks for any vlan, including the pseudo-vlan
id 0, and always returns true if 8021q is loaded. This creates several bad
situations - some warnings in __bond_release_one() because it thinks that
we still have vlans while removing, sending LB packets with vlan id 0 and,
possibly, other caused by vlan id 0.
Fix it by adding a new call, vlan_uses_dev_rcu(), which is the same as
vlan_uses_dev(), but uses rcu_dereference() instead of rtnl, and thus we
can use it in bond_vlan_used() wrapped in rcu_read_lock().
Also, use the pure vlan_uses_dev() in __bond_release_one() cause the rtnl
lock is held there.
CC: Jay Vosburgh <fubar@...ibm.com>
CC: Andy Gospodarek <andy@...yhouse.net>
CC: Patrick McHardy <kaber@...sh.net>
CC: "David S. Miller" <davem@...emloft.net>
Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
---
drivers/net/bonding/bond_alb.c | 1 -
drivers/net/bonding/bond_main.c | 3 +--
drivers/net/bonding/bonding.h | 10 +++++++++-
include/linux/if_vlan.h | 6 ++++++
net/8021q/vlan_core.c | 11 +++++++++++
5 files changed, 27 insertions(+), 4 deletions(-)
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 3a5db7b..2684329 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -34,7 +34,6 @@
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/if_bonding.h>
-#include <linux/if_vlan.h>
#include <linux/in.h>
#include <net/ipx.h>
#include <net/arp.h>
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 5697043..b8c36ac 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -69,7 +69,6 @@
#include <net/arp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
-#include <linux/if_vlan.h>
#include <linux/if_bonding.h>
#include <linux/jiffies.h>
#include <linux/preempt.h>
@@ -1976,7 +1975,7 @@ static int __bond_release_one(struct net_device *bond_dev,
bond_set_carrier(bond);
eth_hw_addr_random(bond_dev);
- if (bond_vlan_used(bond)) {
+ if (vlan_uses_dev(bond_dev)) {
pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
bond_dev->name, bond_dev->name);
pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 4bf52d5..cb49313 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -23,6 +23,7 @@
#include <linux/netpoll.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
+#include <linux/if_vlan.h>
#include "bond_3ad.h"
#include "bond_alb.h"
@@ -267,9 +268,16 @@ struct bonding {
#endif /* CONFIG_DEBUG_FS */
};
+/* use vlan_uses_dev() if under rtnl */
static inline bool bond_vlan_used(struct bonding *bond)
{
- return !list_empty(&bond->vlan_list);
+ bool ret;
+
+ rcu_read_lock();
+ ret = vlan_uses_dev_rcu(bond->dev);
+ rcu_read_unlock();
+
+ return ret;
}
#define bond_slave_get_rcu(dev) \
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 715c343..1fcea36 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -101,6 +101,7 @@ extern void vlan_vids_del_by_dev(struct net_device *dev,
const struct net_device *by_dev);
extern bool vlan_uses_dev(const struct net_device *dev);
+extern bool vlan_uses_dev_rcu(const struct net_device *dev);
#else
static inline struct net_device *
__vlan_find_dev_deep(struct net_device *real_dev,
@@ -155,6 +156,11 @@ static inline bool vlan_uses_dev(const struct net_device *dev)
{
return false;
}
+
+static inline bool vlan_uses_dev_rcu(const struct net_device *dev)
+{
+ return false;
+}
#endif
static inline bool vlan_hw_offload_capable(netdev_features_t features,
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 4a78c4d..52e3fb3 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -399,3 +399,14 @@ bool vlan_uses_dev(const struct net_device *dev)
return vlan_info->grp.nr_vlan_devs ? true : false;
}
EXPORT_SYMBOL(vlan_uses_dev);
+
+bool vlan_uses_dev_rcu(const struct net_device *dev)
+{
+ struct vlan_info *vlan_info;
+
+ vlan_info = rcu_dereference(dev->vlan_info);
+ if (!vlan_info)
+ return false;
+ return vlan_info->grp.nr_vlan_devs ? true : false;
+}
+EXPORT_SYMBOL(vlan_uses_dev_rcu);
--
1.8.1.4
--
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