netdev - Re: [PATCH net] r8169: fix rtl8125b dmar pte write access not set error

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Date:   Sun, 9 Oct 2022 09:45:47 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Chunhao Lin <hau@...ltek.com>
Cc:     netdev@...r.kernel.org, nic_swsd@...ltek.com, kuba@...nel.org,
        grundler@...omium.org
Subject: Re: [PATCH net] r8169: fix rtl8125b dmar pte write access not set
 error

On 04.10.2022 10:10, Chunhao Lin wrote:
> When close device, rx will be enabled if wol is enabeld. When open device
> it will cause rx to dma to wrong address after pci_set_master().
> 
> In this patch, driver will disable tx/rx when close device. If wol is
> eanbled only enable rx filter and disable rxdv_gate to let hardware
> can receive packet to fifo but not to dma it.
> 
> Fixes: 120068481405 ("r8169: fix failing WoL")
> Signed-off-by: Chunhao Lin <hau@...ltek.com>
> ---
>  drivers/net/ethernet/realtek/r8169_main.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 1b7fdb4f056b..c09cfbe1d3f0 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -2239,6 +2239,9 @@ static void rtl_wol_enable_rx(struct rtl8169_private *tp)
>  	if (tp->mac_version >= RTL_GIGA_MAC_VER_25)
>  		RTL_W32(tp, RxConfig, RTL_R32(tp, RxConfig) |
>  			AcceptBroadcast | AcceptMulticast | AcceptMyPhys);
> +
> +	if (tp->mac_version >= RTL_GIGA_MAC_VER_40)
> +		RTL_W32(tp, MISC, RTL_R32(tp, MISC) & ~RXDV_GATED_EN);

Is this correct anyway? Supposedly you want to set this bit to disable DMA.