linux-kernel - Re: [PATCH] net: fec: only clear interrupt of handling queue in fec_enet_rx

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Message-ID: <Ya4KcYlZypEDjQbC@lunn.ch>
Date:   Mon, 6 Dec 2021 14:04:49 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Joakim Zhang <qiangqing.zhang@....com>
Cc:     davem@...emloft.net, kuba@...nel.org, nicolas.diaz@....com,
        rmk+kernel@....linux.org.uk, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-imx@....com
Subject: Re: [PATCH] net: fec: only clear interrupt of handling queue in
 fec_enet_rx_queue()

On Mon, Dec 06, 2021 at 05:05:53PM +0800, Joakim Zhang wrote:
> Only clear interrupt of handling queue in fec_enet_rx_queue(), to avoid
> missing packets caused by clear interrupt of other queues.
> 
> Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> ---
>  drivers/net/ethernet/freescale/fec_main.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index 09df434b2f87..eeefed3043ad 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -1506,7 +1506,12 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
>  			break;
>  		pkt_received++;
>  
> -		writel(FEC_ENET_RXF, fep->hwp + FEC_IEVENT);
> +		if (queue_id == 0)
> +			writel(FEC_ENET_RXF_0, fep->hwp + FEC_IEVENT);
> +		else if (queue_id == 1)
> +			writel(FEC_ENET_RXF_1, fep->hwp + FEC_IEVENT);
> +		else
> +			writel(FEC_ENET_RXF_2, fep->hwp + FEC_IEVENT);

The change itself seems find.

Reviewed-by: Andrew Lunn <andrew@...n.ch>

But could it be moved out of the loop? If you have a budget of 64,
don't you clear this bit 64 times? Can you just clearing it once on
exit?

    Andrew