Am 01.03.2011 21:04, schrieb Daniel Lezcano:
> On 03/01/2011 05:51 PM, Patrick McHardy wrote:
>>> Patrick, do you have any suggestions to fix this ?
>> Since the frames are only looped back locally, I suppose the easiest
>> fix would be to mark them with CHECKSUM_UNNECESSARY. Alternatively
>> we need to complete the checksum manually, similar to what
>> dev_hard_start_xmit() does.
>
> That sounds very simple to fix, maybe too much simple :)
>
> I did the following change:
>
> --- linux-next.orig/drivers/net/macvlan.c
> +++ linux-next/drivers/net/macvlan.c
> @@ -222,6 +222,7 @@ static int macvlan_queue_xmit(struct sk_
>
> if (vlan->mode == MACVLAN_MODE_BRIDGE) {
> const struct ethhdr *eth = (void *)skb->data;
> + skb->ip_summed = CHECKSUM_UNNECESSARY;
>
> /* send to other bridge ports directly */
> if (is_multicast_ether_addr(eth->h_dest)) {
>
>
> and that fixed the problem. Do you think it is acceptable ?
The only problem I see is if the packets are bridged to a
different networking device (or redirected using the mirred
action), in this case the checksum will not be completed.
This would be a very strange setup though and probably wouldn't
be using dummy as lower device, so I'm not sure we have to
worry about this case.
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