netdev - Re: [PATCH v2 2/2] r8169: Enable ASPM for selected NICs

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Date:   Thu, 12 Aug 2021 21:38:51 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>, nic_swsd@...ltek.com
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "open list:8169 10/100/1000 GIGABIT ETHERNET DRIVER" 
        <netdev@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] r8169: Enable ASPM for selected NICs

On 12.08.2021 17:53, Kai-Heng Feng wrote:
> The latest vendor driver enables ASPM for more recent r8168 NICs, do the
> same here to match the behavior.
> 
> In addition, pci_disable_link_state() is only used for RTL8168D/8111D in
> vendor driver, also match that.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
> v2:
>  - No change
> 
>  drivers/net/ethernet/realtek/r8169_main.c | 34 +++++++++++++++++------
>  1 file changed, 26 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 7ab2e841dc69..caa29e72a21a 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -623,7 +623,7 @@ struct rtl8169_private {
>  	} wk;
>  
>  	unsigned supports_gmii:1;
> -	unsigned aspm_manageable:1;
> +	unsigned aspm_supported:1;
>  	unsigned aspm_enabled:1;
>  	struct delayed_work aspm_toggle;
>  	struct mutex aspm_mutex;
> @@ -2667,8 +2667,11 @@ static void rtl_pcie_state_l2l3_disable(struct rtl8169_private *tp)
>  
>  static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable)
>  {
> +	if (!tp->aspm_supported)
> +		return;
> +
>  	/* Don't enable ASPM in the chip if OS can't control ASPM */
> -	if (enable && tp->aspm_manageable) {
> +	if (enable) {
>  		RTL_W8(tp, Config5, RTL_R8(tp, Config5) | ASPM_en);
>  		RTL_W8(tp, Config2, RTL_R8(tp, Config2) | ClkReqEn);
>  	} else {
> @@ -5284,6 +5287,21 @@ static void rtl_init_mac_address(struct rtl8169_private *tp)
>  	rtl_rar_set(tp, mac_addr);
>  }
>  
> +static int rtl_hw_aspm_supported(struct rtl8169_private *tp)
> +{
> +	switch (tp->mac_version) {
> +	case RTL_GIGA_MAC_VER_32 ... RTL_GIGA_MAC_VER_36:
> +	case RTL_GIGA_MAC_VER_38:
> +	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_42:
> +	case RTL_GIGA_MAC_VER_44 ... RTL_GIGA_MAC_VER_46:
> +	case RTL_GIGA_MAC_VER_49 ... RTL_GIGA_MAC_VER_63:

This shouldn't be needed because ASPM support is announced the
standard PCI way. Max a blacklist should be needed if there are
chip versions that announce ASPM support whilst in reality they
do not support it (or support is completely broken).

> +		return 1;
> +
> +	default:
> +		return 0;
> +	}
> +}
> +
>  static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  {
>  	struct rtl8169_private *tp;
> @@ -5315,12 +5333,12 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	if (rc)
>  		return rc;
>  
> -	/* Disable ASPM completely as that cause random device stop working
> -	 * problems as well as full system hangs for some PCIe devices users.
> -	 */
> -	rc = pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
> -					  PCIE_LINK_STATE_L1);
> -	tp->aspm_manageable = !rc;
> +	if (tp->mac_version == RTL_GIGA_MAC_VER_25)
> +		pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
> +				       PCIE_LINK_STATE_L1 |
> +				       PCIE_LINK_STATE_CLKPM);
> +
> +	tp->aspm_supported = rtl_hw_aspm_supported(tp);
>  
>  	/* enable device (incl. PCI PM wakeup and hotplug setup) */
>  	rc = pcim_enable_device(pdev);
>