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

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Date:   Wed, 29 Sep 2021 07:35:51 -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>,
        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>,
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        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, 29 Sep 2021 17:31:04 +0300 Leon Romanovsky wrote:
> 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:  
> > > 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

Still those are global for the driver, no?

What if you have multiple NICs or whatever.