Subject: Re: [PATCH 2/3] macvlan: implement VEPA and private mode

From: Eric Dumazet <[email-masked]>
Date: Wed, 18 Nov 2009 07:42:21 +0100

Arnd Bergmann a écrit :
> This allows each macvlan slave device to be in one
> of three modes, depending on the use case:
> 
> MACVLAN_MODE_PRIVATE:
>   The device never communicates with any other device
>   on the same upper_dev. This even includes frames
>   coming back from a reflective relay, where supported
>   by the adjacent bridge.
> 
> MACVLAN_MODE_VEPA:
>   The new Virtual Ethernet Port Aggregator (VEPA) mode,
>   we assume that the adjacent bridge returns all frames
>   where both source and destination are local to the
>   macvlan port, i.e. the bridge is set up as a reflective
>   relay.
>   Broadcast frames coming in from the upper_dev get
>   flooded to all macvlan interfaces in VEPA mode.
>   We never deliver any frames locally.
> 
> MACVLAN_MODE_BRIDGE:
>   We provide the behavior of a simple bridge between
>   different macvlan interfaces on the same port. Frames
>   from one interface to another one get delivered directly
>   and are not sent out externally. Broadcast frames get
>   flooded to all other bridge ports and to the external
>   interface, but when they come back from a reflective
>   relay, we don't deliver them again.
>   Since we know all the MAC addresses, the macvlan bridge
>   mode does not require learning or STP like the bridge
>   module does.
> 
> Signed-off-by: Arnd Bergmann <[email-masked]>
> ---

>  	if (is_multicast_ether_addr(eth->h_dest)) {
> -		macvlan_broadcast(skb, port, NULL);
> +		src = macvlan_hash_lookup(port, eth->h_source);
> +		if (!src)
> +			/* frame comes from an external address */

> +			macvlan_broadcast(skb, port, NULL, MACVLAN_MODE_VEPA
> +				| MACVLAN_MODE_VEPA | MACVLAN_MODE_BRIDGE);

typo here, you probably meant MACVLAN_PRIVATE | MACVLAN_VEPA | MACVLAN_BRIDGE 

> +		else if (src->mode == MACVLAN_MODE_VEPA)
> +			/* flood to everyone except source */
> +			macvlan_broadcast(skb, port, src->dev,
> +				MACVLAN_MODE_VEPA | MACVLAN_MODE_BRIDGE);
> +		else if (src->mode == MACVLAN_MODE_BRIDGE)
> +			/* flood only to VEPA ports, bridge ports
> +			   already saw the frame */
> +			macvlan_broadcast(skb, port, src->dev,
> +				MACVLAN_MODE_VEPA);
>  		return skb;
>  	}
>