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

Message ID 1401951028-9800-2-git-send-email-dingtianhong@huawei.com
State New
Headers show

Commit Message

Ding Tianhong June 5, 2014, 6:50 a.m.
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.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
---
 drivers/net/macvlan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Vlad Yasevich June 5, 2014, 1:52 p.m. | #1
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@huawei.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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John Fastabend June 5, 2014, 2:12 p.m. | #2
On 6/5/2014 6:52 AM, Vlad Yasevich wrote:
> 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?

I don't think the offload path works as it is either though (need to
test). The issue is sync'ing with the lowerdev doesn't give the lowerdev
any information on which fwd_priv to set so the lowerdev sets the normal
path with the address. It won't "break" traffic just receive flows wont
use the direct hardware queues. This will be a bigger issue once we get
support for metering and hardware ACLs.

Agreed though, Ding how does this work? Looks like a step back to me. At
very least can we get the commit message to explain this a bit better.

.John

>> Signed-off-by: Ding Tianhong <dingtianhong@huawei.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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Patch

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 {