netdev - Re: [PATCH net-next v1 1/1] net: fec: Add VLAN receive HW support.

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Message-ID: <1372326283.4134.15.camel@weser.hi.pengutronix.de>
Date:	Thu, 27 Jun 2013 11:44:43 +0200
From:	Lucas Stach <l.stach@...gutronix.de>
To:	Jim Baxter <jim_baxter@...tor.com>
Cc:	Duan Fugang-B38611 <B38611@...escale.com>,
	"David S. Miller" <davem@...emloft.net>,
	Li Frank-B20596 <B20596@...escale.com>,
	Estevam Fabio-R49496 <r49496@...escale.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: Re: [PATCH net-next v1 1/1] net: fec: Add VLAN receive HW support.

Am Mittwoch, den 26.06.2013, 12:45 +0100 schrieb Jim Baxter:
> On 26/06/13 12:18, Duan Fugang-B38611 wrote:
> > On 06/26/13 18:09, Jim Baxter wrote:
> > 
> >>> In addition,
> >>> 	1.	enet IP support hw VLAN detect such as imx28-fec, imx6q-fec and mvf600-fec, so you can add the "BD_ENET_RX_VLAN " to those platform driver_data.
> >> I have only tested it on the i.MX6, if someone wants to check it on the
> >> imx28 later they can add it to that option.
> > 
> >>> 	2.	Enable the VLAN tag extraction with "NETIF_F_HW_VLAN_CTAG_RX" feature in .ndo_fix_features, which is configured by user.
> >> What do you mean by this, I am only enabling the VLAN code if (ndev->features & NETIF_F_HW_VLAN_CTAG_RX) is set. I am pretty sure this is set by
> > 
> > You can enable the feature like below, which is reasonable.
> > .ndo_fix_features   = fec_enet_fix_features
> > 
> > static netdev_features_t fec_enet_fix_features (struct net_device *dev, 
> >         netdev_features_t features)
> > {
> >         struct fec_enet_private *fep = netdev_priv(dev);
> > 	  const struct platform_device_id *id_entry =
> > 					platform_get_device_id(fep->pdev);
> > 
> > 	  if (id_entry->driver_data & FEC_QUIRK_HAS_VLAN)
> >         	features |= NETIF_F_HW_VLAN_CTAG_RX;
> > 
> > 	  return features;
> > }
> > 
> > 
> > Thank you,
> > Andy
> > 
> > 
> 
> I currently set the features in fec_enet_init() along with setting
> hw_features, is fec_enet_fix_features() a more correct design for driver
> implementation point?
> 
I agree that VLAN tag extraction should not be enabled by default, but
at the users request. But according to the documentation there is no
need to implement the fix_features callback for this to work.

Just only set the hw_features on init, the networking core should take
care of never trying to enable a feature not found in there.

Regards,
Lucas
-- 
Pengutronix e.K.                           | Lucas Stach                 |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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