netdev - Re: [PATCH net-next v3 01/26] switchdev: introduce get/set attrs ops

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Message-ID: <CAGVrzcZvzWDeV7XvZx13fK_u0oYD=mAJKQ5JUNm9UhirBqAHow@mail.gmail.com>
Date:	Thu, 2 Apr 2015 02:09:05 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Scott Feldman <sfeldma@...il.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Jiří Pírko <jiri@...nulli.us>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	Guenter Roeck <linux@...ck-us.net>,
	sridhar.samudrala@...el.com, "Arad, Ronen" <ronen.arad@...el.com>
Subject: Re: [PATCH net-next v3 01/26] switchdev: introduce get/set attrs ops

[snip]

> +       int err = -EOPNOTSUPP;
> +
> +       if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
> +               return err;

That check is currently going to prevent DSA from working, since we do
not yet advertise NETIF_HW_SWITCH_OFFLOAD (which should be fixed). In
general, though I am not sure this is entirely desirable to check that
here for multiple reasons:

- stacked devices typically propagate lower devices dev->features, but
if they are purposely not doing it, this might start breaking
- is not that check, used as it is now, that unconditionally, end-up
being redundant with e.g: getting the switch device id to identify
this net_device as a switch port net_device?

I kind of preferred when we had this moved into the
__swdev_attr_{get,set} caller, such we had finer control over whether
or not checking for these kinds of features makes sense for a
particular operation.
--
Florian
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