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Message-ID: <YVR4qDxiQw95jaWK@unreal>
Date:   Wed, 29 Sep 2021 17:31:04 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jakub Kicinski <kuba@...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>,
        Bin Luo <luobin9@...wei.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Coiby Xu <coiby.xu@...il.com>,
        Derek Chickles <dchickles@...vell.com>, drivers@...sando.io,
        Eric Dumazet <eric.dumazet@...il.com>,
        Felix Manlunas <fmanlunas@...vell.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        GR-everest-linux-l2@...vell.com, GR-Linux-NIC-Dev@...vell.com,
        hariprasad <hkelam@...vell.com>,
        Ido Schimmel <idosch@...dia.com>,
        intel-wired-lan@...ts.osuosl.org,
        Ioana Ciornei <ioana.ciornei@....com>,
        Jerin Jacob <jerinj@...vell.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Jiri Pirko <jiri@...dia.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Linu Cherian <lcherian@...vell.com>,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-staging@...ts.linux.dev,
        Manish Chopra <manishc@...vell.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Moshe Shemesh <moshe@...dia.com>, netdev@...r.kernel.org,
        oss-drivers@...igine.com,
        Richard Cochran <richardcochran@...il.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Satanand Burla <sburla@...vell.com>,
        Shannon Nelson <snelson@...sando.io>,
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        Subbaraya Sundeep <sbhatta@...vell.com>,
        Sunil Goutham <sgoutham@...vell.com>,
        Taras Chornyi <tchornyi@...vell.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        UNGLinuxDriver@...rochip.com, Vadym Kochan <vkochan@...vell.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        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, Sep 29, 2021 at 07:26:31AM -0700, Jakub Kicinski wrote:
> 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?

No, I have two:
* Base ops - mlx5_devlink_ops
* Extra reload commands - mlx5_devlink_reload

Thanks

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