netdev - Re: DSA and underlying 802.1Q encapsulation

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Date:	Wed, 27 May 2015 16:48:37 -0400 (EDT)
From:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Andrew Lunn <andrew@...n.ch>, Chris Healy <cphealy@...il.com>,
	Jérome Oufella 
	<jerome.oufella@...oirfairelinux.com>
Subject: Re: DSA and underlying 802.1Q encapsulation

Hi Guenter,

> Interesting question. Does the underlying network device support VLAN HW
> acceleration (NETIF_F_HW_VLAN_CTAG_RX, NETIF_F_HW_VLAN_CTAG_TX) ?

Yes, in our case, it's an IGB device.

I also set the DSA slave_dev->features and slave_dev->vlan_features to
master->vlan_features | NETIF_F_VLAN_FEATURES | NETIF_F_HW_SWITCH_OFFLOAD, 
not sure if it is good or not.

> If yes, the dsa code may need to move the tag into the header.
> If we are lucky, a call to vlan_hwaccel_push_inside() might do it.

Thanks, I'm currently looking into it and doing some tests, I'm coming back to 
you asap.

> Do you have some vlan dsa code to share, by any chance ? That might
> save me some time, as I am looking into it as well.

Yes, I am about the send an RFC for fully integrated 802.1q VLAN support on 
Marvell 88E6352 devices.

Thanks,
-v
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