linux-kernel - Re: [PATCH v13 net-next 08/15] net: mvpp2: add FCA RXQ non occupied descriptor threshold

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Date:   Thu, 11 Feb 2021 12:50:09 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     stefanc@...vell.com
Cc:     netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
        davem@...emloft.net, nadavh@...vell.com, ymarkman@...vell.com,
        linux-kernel@...r.kernel.org, kuba@...nel.org, mw@...ihalf.com,
        andrew@...n.ch, atenart@...nel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, sebastian.hesselbarth@...il.com,
        gregory.clement@...tlin.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v13 net-next 08/15] net: mvpp2: add FCA RXQ non occupied
 descriptor threshold

On Thu, Feb 11, 2021 at 12:48:55PM +0200, stefanc@...vell.com wrote:
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> index 761f745..8b4073c 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> @@ -1133,14 +1133,19 @@ static inline void mvpp2_qvec_interrupt_disable(struct mvpp2_queue_vector *qvec)
>  static void mvpp2_interrupts_mask(void *arg)
>  {
>  	struct mvpp2_port *port = arg;
> +	int cpu = smp_processor_id();
> +	u32 thread;
>  
>  	/* If the thread isn't used, don't do anything */
> -	if (smp_processor_id() > port->priv->nthreads)
> +	if (cpu > port->priv->nthreads)
>  		return;

What happened to a patch fixing this? Did I miss it? Was it submitted
independently to the net tree?

> @@ -1150,20 +1155,25 @@ static void mvpp2_interrupts_mask(void *arg)
>  static void mvpp2_interrupts_unmask(void *arg)
>  {
>  	struct mvpp2_port *port = arg;
> -	u32 val;
> +	int cpu = smp_processor_id();
> +	u32 val, thread;
>  
>  	/* If the thread isn't used, don't do anything */
> -	if (smp_processor_id() > port->priv->nthreads)
> +	if (cpu > port->priv->nthreads)
>  		return;

Ditto.

I don't think these need to be fixed in the net tree, but it would still
be nice to fix the problem. Please do so, as an initial patch in your
series - so we can then backport if it turns out to eventually be
necessary.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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