netdev - Re: [PATCH net-next v1 4/5] net/mlx5: Register separate reload devlink ops for multiport device

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Message-ID: <20210929072631.437ffad9@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 29 Sep 2021 07:26:31 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>, Ariel Elior <aelior@...vell.com>,
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        Yisen Zhuang <yisen.zhuang@...wei.com>
Subject: Re: [PATCH net-next v1 4/5] net/mlx5: Register separate reload
 devlink ops for multiport device

On Wed, 29 Sep 2021 17:16:28 +0300 Leon Romanovsky wrote:
> > > @@ -808,6 +812,9 @@ int mlx5_devlink_register(struct devlink *devlink)
> > >  	if (err)
> > >  		goto traps_reg_err;
> > >  
> > > +	if (!mlx5_core_is_mp_slave(dev))
> > > +		devlink_set_ops(devlink, &mlx5_devlink_reload);  
> > 
> > Does this work? Where do you make a copy of the ops? 🤔 You can't modify
> > the driver-global ops, to state the obvious.  
> 
> devlink_ops pointer is not constant at this stage, so why can't I copy
> reload_* pointers to the "main" devlink ops?
> 
> I wanted to avoid to copy all pointers.

Hm. I must be missing a key piece here. IIUC you want to have different
ops based on some device property. But there is only one

static struct devlink_ops mlx5_devlink_ops;

so how can two devlink instances in the system use that and have
different ops without a copy?