linux-kernel - Re: [PATCH net] net: lan966x: Remove ptp traps in case the ptp is not enabled.

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Message-ID: <20240517101811.vsqcg7moapixlfpj@DEN-DL-M31836.microchip.com>
Date: Fri, 17 May 2024 12:18:11 +0200
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: Vladimir Oltean <vladimir.oltean@....com>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <richardcochran@...il.com>, <jacob.e.keller@...el.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net] net: lan966x: Remove ptp traps in case the ptp is
 not enabled.

The 05/17/2024 13:04, Vladimir Oltean wrote:
> 
> On Thu, May 16, 2024 at 08:48:55AM +0200, Horatiu Vultur wrote:
> > > Alternatively, the -EOPNOTSUPP check could be moved before programming
> > > the traps in the first place.
> >
> > Thanks for the review.
> > Actually I don't think this alternative will work. In case of PHY
> > timestamping, we would still like to add those rules regardless if
> > ptp is enabled on lan966x.
> >
> > >
> > > Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
> >
> > --
> > /Horatiu
> 
> I don't understand why this would not have worked?
> 
> diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
> index b12d3b8a64fd..1439a36e8394 100644
> --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
> +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
> @@ -474,14 +474,14 @@ static int lan966x_port_hwtstamp_set(struct net_device *dev,
>             cfg->source != HWTSTAMP_SOURCE_PHYLIB)
>                 return -EOPNOTSUPP;
> 
> +       if (cfg->source == HWTSTAMP_SOURCE_NETDEV && !port->lan966x->ptp)
> +               return -EOPNOTSUPP;
> +

This should also work.
Initially I thought you wanted to have only the check for
port->lan966x->ptp here. And that is why I said it would not work.

>         err = lan966x_ptp_setup_traps(port, cfg);
>         if (err)
>                 return err;
> 
>         if (cfg->source == HWTSTAMP_SOURCE_NETDEV) {
> -               if (!port->lan966x->ptp)
> -                       return -EOPNOTSUPP;
> -
>                 err = lan966x_ptp_hwtstamp_set(port, cfg, extack);
>                 if (err) {
>                         lan966x_ptp_del_traps(port);

-- 
/Horatiu