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 17:16:28 +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>,
        Shay Drory <shayd@...dia.com>,
        Simon Horman <simon.horman@...igine.com>,
        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 06:55:49AM -0700, Jakub Kicinski wrote:
> On Wed, 29 Sep 2021 15:00:45 +0300 Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@...dia.com>
> > 
> > Mulitport slave device doesn't support devlink reload, so instead of
> > complicating initialization flow with devlink_reload_enable() which
> > will be removed in next patch, set specialized devlink ops callbacks
> > for reload operations.
> > 
> > This fixes an error when reload counters exposed (and equal zero) for
> > the mode that is not supported at all.
> > 
> > Fixes: d89ddaae1766 ("net/mlx5: Disable devlink reload for multi port slave device")
> > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> > ---
> >  drivers/net/ethernet/mellanox/mlx5/core/devlink.c | 13 ++++++++++---
> >  1 file changed, 10 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
> > index 47c9f7f5bb79..e85eca6976a9 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
> > @@ -309,14 +309,17 @@ static struct devlink_ops mlx5_devlink_ops = {
> >  #endif
> >  	.flash_update = mlx5_devlink_flash_update,
> >  	.info_get = mlx5_devlink_info_get,
> > +	.trap_init = mlx5_devlink_trap_init,
> > +	.trap_fini = mlx5_devlink_trap_fini,
> > +	.trap_action_set = mlx5_devlink_trap_action_set,
> > +};
> > +
> > +static struct devlink_ops mlx5_devlink_reload = {
> >  	.reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
> >  			  BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE),
> >  	.reload_limits = BIT(DEVLINK_RELOAD_LIMIT_NO_RESET),
> >  	.reload_down = mlx5_devlink_reload_down,
> >  	.reload_up = mlx5_devlink_reload_up,
> > -	.trap_init = mlx5_devlink_trap_init,
> > -	.trap_fini = mlx5_devlink_trap_fini,
> > -	.trap_action_set = mlx5_devlink_trap_action_set,
> >  };
> >  
> >  void mlx5_devlink_trap_report(struct mlx5_core_dev *dev, int trap_id, struct sk_buff *skb,
> > @@ -791,6 +794,7 @@ static void mlx5_devlink_traps_unregister(struct devlink *devlink)
> >  
> >  int mlx5_devlink_register(struct devlink *devlink)
> >  {
> > +	struct mlx5_core_dev *dev = devlink_priv(devlink);
> >  	int err;
> >  
> >  	err = devlink_params_register(devlink, mlx5_devlink_params,
> > @@ -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.

Thanks