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

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Message-ID: <51CC4622.9080702@mentor.com>
Date:	Thu, 27 Jun 2013 15:03:14 +0100
From:	Jim Baxter <jim_baxter@...tor.com>
To:	Lucas Stach <l.stach@...gutronix.de>
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.

On 27/06/13 10:44, Lucas Stach wrote:
> 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
> 
Hi Lucas,

Yes that is how the patch currently operates, the user can still choose
whether the feature is enabled.

Thank you,
Jim
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