linux-kernel - Re: [PATCH] net: fec: properly guard irq coalesce setup

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Date:   Tue, 06 Dec 2022 07:16:10 +0100
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Joakim Zhang <qiangqing.zhang@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Greg Ungerer <gregungerer@...tnet.com.au>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: fec: properly guard irq coalesce setup

Am Montag, 5. Dezember 2022, 21:46:04 CET schrieb Rasmus Villemoes:
> Prior to the Fixes: commit, the initialization code went through the
> same fec_enet_set_coalesce() function as used by ethtool, and that
> function correctly checks whether the current variant has support for
> irq coalescing.
> 
> Now that the initialization code instead calls fec_enet_itr_coal_set()
> directly, that call needs to be guarded by a check for the
> FEC_QUIRK_HAS_COALESCE bit.
> 
> Fixes: df727d4547de (net: fec: don't reset irq coalesce settings to defaults
> on "ip link up") Reported-by: Greg Ungerer <gregungerer@...tnet.com.au>
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> ---
>  drivers/net/ethernet/freescale/fec_main.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> b/drivers/net/ethernet/freescale/fec_main.c index
> 2ca2b61b451f..23e1a94b9ce4 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -1220,7 +1220,8 @@ fec_restart(struct net_device *ndev)
>  		writel(0, fep->hwp + FEC_IMASK);
> 
>  	/* Init the interrupt coalescing */
> -	fec_enet_itr_coal_set(ndev);
> +	if (fep->quirks & FEC_QUIRK_HAS_COALESCE)
> +		fec_enet_itr_coal_set(ndev);
>  }
> 
>  static int fec_enet_ipc_handle_init(struct fec_enet_private *fep)

I'm wondering if this check should be added to fec_enet_itr_coal_set() 
instead. Right now any additional caller has to do it's own check for 
FEC_QUIRK_HAS_COALESCE, so why not do check in fec_enet_itr_coal_set?
But I'm okay with this change as well.

Best regards,
Alexander