* Re: [Bonding-devel] Bonding on bond
[not found] ` <4D354A38.5000802@gmail.com>
@ 2011-01-19 15:49 ` Jiri Bohac
0 siblings, 0 replies; only message in thread
From: Jiri Bohac @ 2011-01-19 15:49 UTC (permalink / raw)
To: Nicolas de Pesloüan, Jay Vosburgh; +Cc: bonding-devel, netdev
On Tue, Jan 18, 2011 at 09:07:20AM +0100, Nicolas de Pesloüan wrote:
> Staking bond is not supported. Currently, no setup is know to
> require stacking bond.
I agree. This question and weird bugreports from people trying
this come up over and over. How about this patch?
bonding: prohibit enslaving of bonding masters
Nested bonding is not supported and will result in strange problems, e.g.:
- netif_receive_skb() will not properly change skb->dev to point to the
uppoer-most bonding master
- arp monitor will not work (dev->last_rx is only updated by hardware drivers)
- accidentally enslaving a bonding master to itself will cause an infinite
recursion in the TX path
This patch prevents this by prohibiting a bonding master from being further enslaved.
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index b1025b8..d4d5f42 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1448,8 +1448,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
}
/* already enslaved */
- if (slave_dev->flags & IFF_SLAVE) {
- pr_debug("Error, Device was already enslaved\n");
+ if (slave_dev->priv_flags & IFF_BONDING) {
+ pr_debug("Error, Device already enslaved or a bonding master\n");
return -EBUSY;
}
--
Jiri Bohac <jbohac@suse.cz>
SUSE Labs, SUSE CZ
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