netdev - Re: [PATCH net-2.6 1/3] bonding/vlan: Remove redundant VLAN tag insertion logic

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Date:	Mon, 13 Dec 2010 11:58:17 -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 1/3] bonding/vlan: Remove redundant VLAN tag insertion logic

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

>A bond may have a mixture of slave devices with and without hardware
>VLAN tag insertion capability.  Therefore it always claims this
>capability and performs software VLAN tag insertion if the slave does
>not.
>
>Since commit 7b9c60903714bf0a19d746b228864bad3497284e, this has
>also been done by dev_hard_start_xmit().  The result is that VLAN-
>tagged skbs are now double-tagged when transmitted through slave
>devices without hardware VLAN tag insertion!
>
>Remove the now-redundant logic from bond_dev_queue_xmit().
>
>Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>

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

>---
> drivers/net/bonding/bond_main.c |   27 +--------------------------
> 1 files changed, 1 insertions(+), 26 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index d0ea760..ef370c9 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -418,36 +418,11 @@ struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
>  * @bond: bond device that got this skb for tx.
>  * @skb: hw accel VLAN tagged skb to transmit
>  * @slave_dev: slave that is supposed to xmit this skbuff
>- *
>- * When the bond gets an skb to transmit that is
>- * already hardware accelerated VLAN tagged, and it
>- * needs to relay this skb to a slave that is not
>- * hw accel capable, the skb needs to be "unaccelerated",
>- * i.e. strip the hwaccel tag and re-insert it as part
>- * of the payload.
>  */
> int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
> 			struct net_device *slave_dev)
> {
>-	unsigned short uninitialized_var(vlan_id);
>-
>-	/* Test vlan_list not vlgrp to catch and handle 802.1p tags */
>-	if (!list_empty(&bond->vlan_list) &&
>-	    !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
>-	    vlan_get_tag(skb, &vlan_id) == 0) {
>-		skb->dev = slave_dev;
>-		skb = vlan_put_tag(skb, vlan_id);
>-		if (!skb) {
>-			/* vlan_put_tag() frees the skb in case of error,
>-			 * so return success here so the calling functions
>-			 * won't attempt to free is again.
>-			 */
>-			return 0;
>-		}
>-	} else {
>-		skb->dev = slave_dev;
>-	}
>-
>+	skb->dev = slave_dev;
> 	skb->priority = 1;
> #ifdef CONFIG_NET_POLL_CONTROLLER
> 	if (unlikely(bond->dev->priv_flags & IFF_IN_NETPOLL)) {
>-- 
>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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