linux-kernel - Re: [PATCH 3/4 net] qca_spi: Fix ethtool -G iface tx behavior

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Date:   Thu, 23 Nov 2023 12:51:21 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Stefan Wahren <wahrenst@....net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Lino Sanfilippo <LinoSanfilippo@....de>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4 net] qca_spi: Fix ethtool -G iface tx behavior

On Tue, 2023-11-21 at 17:30 +0100, Stefan Wahren wrote:
> After calling ethtool -g it was not possible to adjust the TX ring size
> again. 

Could you please report the exact command sequence that will fail?


> The reason for this is that the readonly setting rx_pending get
> initialized and after that the range check in qcaspi_set_ringparam()
> fails regardless of the provided parameter. Since there is no adjustable
> RX ring at all, drop it from qcaspi_get_ringparam().

> 
> Fixes: 291ab06ecf67 ("net: qualcomm: new Ethernet over SPI driver for QCA7000")
> Signed-off-by: Stefan Wahren <wahrenst@....net>
> ---
>  drivers/net/ethernet/qualcomm/qca_debug.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qualcomm/qca_debug.c b/drivers/net/ethernet/qualcomm/qca_debug.c
> index 6f2fa2a42770..613eb688cba2 100644
> --- a/drivers/net/ethernet/qualcomm/qca_debug.c
> +++ b/drivers/net/ethernet/qualcomm/qca_debug.c
> @@ -252,9 +252,7 @@ qcaspi_get_ringparam(struct net_device *dev, struct ethtool_ringparam *ring,
>  {
>  	struct qcaspi *qca = netdev_priv(dev);
> 
> -	ring->rx_max_pending = 4;
>  	ring->tx_max_pending = TX_RING_MAX_LEN;
> -	ring->rx_pending = 4;
>  	ring->tx_pending = qca->txr.count;
>  }

I think it's preferable update qcaspi_set_ringparam() to complete
successfully when the provided arguments don't change the rx_pending
default (4)

Cheers,

Paolo