netdev - Re: [RFC PATCH net-next 1/7] net: sunhme: Just restart autonegotiation if we can't bring the link up

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Message-ID: <Y/o9tr8bV/eW4xOI@corigine.com>
Date:   Sat, 25 Feb 2023 17:56:22 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Sean Anderson <seanga2@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 1/7] net: sunhme: Just restart
 autonegotiation if we can't bring the link up

On Wed, Feb 22, 2023 at 04:03:49PM -0500, Sean Anderson wrote:
> If we've tried regular autonegotiation and forcing the link mode, just
> restart autonegotiation instead of reinitializing the whole NIC.
> 
> Signed-off-by: Sean Anderson <seanga2@...il.com>
> ---
> 
>  drivers/net/ethernet/sun/sunhme.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/sun/sunhme.c b/drivers/net/ethernet/sun/sunhme.c
> index dd14114cbcfb..3eeda8f3fa80 100644
> --- a/drivers/net/ethernet/sun/sunhme.c
> +++ b/drivers/net/ethernet/sun/sunhme.c
> @@ -589,7 +589,10 @@ static int set_happy_link_modes(struct happy_meal *hp, void __iomem *tregs)
>  	return 1;
>  }
>  
> -static int happy_meal_init(struct happy_meal *hp);
> +static void
> +happy_meal_begin_auto_negotiation(struct happy_meal *hp,
> +				  void __iomem *tregs,
> +				  const struct ethtool_link_ksettings *ep);

I think it is preferable, though far more verbose, to move
happy_meal_begin_auto_negotiation() before happy_meal_timer and avoid the
need for a forward declaration. I did try this locally, and it did
compile.

>  static int is_lucent_phy(struct happy_meal *hp)
>  {
> @@ -743,12 +746,7 @@ static void happy_meal_timer(struct timer_list *t)
>  					netdev_notice(hp->dev,
>  						      "Link down, cable problem?\n");
>  
> -					ret = happy_meal_init(hp);
> -					if (ret) {
> -						/* ho hum... */
> -						netdev_err(hp->dev,
> -							   "Error, cannot re-init the Happy Meal.\n");
> -					}
> +					happy_meal_begin_auto_negotiation(hp, tregs, NULL);
>  					goto out;
>  				}
>  				if (!is_lucent_phy(hp)) {
> -- 
> 2.37.1
>