netdev - Re: [PATCH net-2.6 3/3] bonding/vlan: Fix mangled NAs on slaves without VLAN tag insertion

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Date:	Mon, 13 Dec 2010 12:43:06 -0800
From:	Jay Vosburgh <fubar@...ibm.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-net-drivers@...arflare.com, Jesse Gross <jesse@...ira.com>
Subject: Re: [PATCH net-2.6 3/3] bonding/vlan: Fix mangled NAs on slaves without VLAN tag insertion

Ben Hutchings <bhutchings@...arflare.com> wrote:

>bond_na_send() attempts to insert a VLAN tag in between building and
>sending packets of the respective formats.  If the slave does not
>implement hardware VLAN tag insertion then vlan_put_tag() will mangle
>the network-layer header because the Ethernet header is not present at
>this point (unlike in bond_arp_send()).
>
>Fix this by adding the tag out-of-line and relying on
>dev_hard_start_xmit() to insert it inline if necessary.
>
>Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>

Signed-off-by: Jay Vosburgh <fubar@...ibm.com>

>---
> drivers/net/bonding/bond_ipv6.c |    7 ++++++-
> 1 files changed, 6 insertions(+), 1 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_ipv6.c b/drivers/net/bonding/bond_ipv6.c
>index 121b073..84fbd4e 100644
>--- a/drivers/net/bonding/bond_ipv6.c
>+++ b/drivers/net/bonding/bond_ipv6.c
>@@ -88,7 +88,12 @@ static void bond_na_send(struct net_device *slave_dev,
> 	}
>
> 	if (vlan_id) {
>-		skb = vlan_put_tag(skb, vlan_id);
>+		/* The Ethernet header is not present yet, so it is
>+		 * too early to insert a VLAN tag.  Force use of an
>+		 * out-of-line tag here and let dev_hard_start_xmit()
>+		 * insert it if the slave hardware can't.
>+		 */
>+		skb = __vlan_hwaccel_put_tag(skb, vlan_id);
> 		if (!skb) {
> 			pr_err("failed to insert VLAN tag\n");
> 			return;
>-- 
>1.7.3.2
>
>
>-- 
>Ben Hutchings, Senior Software Engineer, Solarflare Communications
>Not speaking for my employer; that's the marketing department's job.
>They asked us to note that Solarflare product names are trademarked.
>
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