netdev - Re: [RFC PATCH v3 3/5] Add ndo_hwtstamp_get/set support to vlan code path

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Date:   Wed, 5 Apr 2023 20:03:22 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Maxim Georgiev <glipus@...il.com>, kory.maincent@...tlin.com,
        netdev@...r.kernel.org, maxime.chevallier@...tlin.com,
        vadim.fedorenko@...ux.dev, richardcochran@...il.com,
        gerhard@...leder-embedded.com
Subject: Re: [RFC PATCH v3 3/5] Add ndo_hwtstamp_get/set support to vlan code
 path

On Wed, Apr 05, 2023 at 09:42:10AM -0700, Jakub Kicinski wrote:
> This needs to live in the core. I think the real_dev is a lower of the
> vlan device? All the vlan driver should do is attach the generic helper:
> 
> 	.ndo_hwtstamp_get = generic_hwtstamp_get_lower,
> 
> and the same for set. No?

The goal would be for macvlan and bonding to use the same generic_hwtstamp_get_lower()?
How would the generic helper get to bond_option_active_slave_get_rcu(),
vlan_dev_priv(dev)->real_dev, macvlan_dev_real_dev(dev)?

Perhaps a generic_hwtstamp_get_lower() that takes the lower as argument,
and 3 small wrappers in vlan, macvlan, bonding which identify that lower?