netdev - Re: [PATCH net-next v3 3/3] r8169: Enable ASPM for selected NICs

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Date:   Thu, 19 Aug 2021 08:02:26 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>, nic_swsd@...ltek.com,
        bhelgaas@...gle.com
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 3/3] r8169: Enable ASPM for selected NICs

On 19.08.2021 07:45, Kai-Heng Feng wrote:
> The latest vendor driver enables ASPM for more recent r8168 NICs, so
> disable ASPM on older chips and enable ASPM for the rest.
> 
> Rename aspm_manageable to pcie_aspm_manageable to indicate it's ASPM
> from PCIe, and use rtl_aspm_supported for Realtek NIC's internal ASPM
> function.
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
> v3:
>  - Use pcie_aspm_supported() to retrieve ASPM support status
>  - Use whitelist for r8169 internal ASPM status
> 
> v2:
>  - No change
> 
>  drivers/net/ethernet/realtek/r8169_main.c | 27 ++++++++++++++++-------
>  1 file changed, 19 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 3359509c1c351..88e015d93e490 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -623,7 +623,8 @@ struct rtl8169_private {
>  	} wk;
>  
>  	unsigned supports_gmii:1;
> -	unsigned aspm_manageable:1;
> +	unsigned pcie_aspm_manageable:1;
> +	unsigned rtl_aspm_supported:1;
>  	unsigned rtl_aspm_enabled:1;
>  	struct delayed_work aspm_toggle;
>  	atomic_t aspm_packet_count;
> @@ -702,6 +703,20 @@ static bool rtl_is_8168evl_up(struct rtl8169_private *tp)
>  	       tp->mac_version <= RTL_GIGA_MAC_VER_53;
>  }
>  
> +static int rtl_supports_aspm(struct rtl8169_private *tp)
> +{
> +	switch (tp->mac_version) {
> +	case RTL_GIGA_MAC_VER_02 ... RTL_GIGA_MAC_VER_31:
> +	case RTL_GIGA_MAC_VER_37:
> +	case RTL_GIGA_MAC_VER_39:
> +	case RTL_GIGA_MAC_VER_43:
> +	case RTL_GIGA_MAC_VER_47:
> +		return 0;
> +	default:
> +		return 1;
> +	}
> +}
> +
>  static bool rtl_supports_eee(struct rtl8169_private *tp)
>  {
>  	return tp->mac_version >= RTL_GIGA_MAC_VER_34 &&
> @@ -2669,7 +2684,7 @@ 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_manageable && enable)
> +	if (!(tp->pcie_aspm_manageable && tp->rtl_aspm_supported) && enable)
>  		return;
>  
>  	tp->rtl_aspm_enabled = enable;
> @@ -5319,12 +5334,8 @@ 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;
> +	tp->pcie_aspm_manageable = pcie_aspm_supported(pdev);

That's not what I meant, and it's also not correct.

> +	tp->rtl_aspm_supported = rtl_supports_aspm(tp);
>  
>  	/* enable device (incl. PCI PM wakeup and hotplug setup) */
>  	rc = pcim_enable_device(pdev);
>