netdev - Re: [PATCH net-next 1/4] macvlan: don't update the uc and vlan list for L2 forwarding offload

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Message-ID: <5390761A.5030808@gmail.com>
Date:	Thu, 05 Jun 2014 09:52:26 -0400
From:	Vlad Yasevich <vyasevich@...il.com>
To:	Ding Tianhong <dingtianhong@...wei.com>, kaber@...sh.net,
	davem@...emloft.net, edumazet@...gle.com, vyasevic@...hat.com
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] macvlan: don't update the uc and vlan list
 for L2 forwarding offload

On 06/05/2014 02:50 AM, Ding Tianhong wrote:
> If lowerdev supports L2 forwarding offload, no need to set mac address
> to uc list and vlan list, so also don't do that when the macvlan mac address
> changes.
> 

Are you sure about this?  How would the lower dev receive traffic
destined to the new HW address if it is not in the device unicast filter
list?

-vlad

> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
> ---
>  drivers/net/macvlan.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
> index 453d55a..c3a54a6 100644
> --- a/drivers/net/macvlan.c
> +++ b/drivers/net/macvlan.c
> @@ -515,7 +515,7 @@ static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
>  	struct net_device *lowerdev = vlan->lowerdev;
>  	int err;
>  
> -	if (!(dev->flags & IFF_UP)) {
> +	if (!(dev->flags & IFF_UP) || vlan->fwd_priv) {
>  		/* Just copy in the new address */
>  		ether_addr_copy(dev->dev_addr, addr);
>  	} else {
> 

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