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

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Date:   Thu, 19 Aug 2021 14:50:44 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     nic_swsd <nic_swsd@...ltek.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v3 3/3] r8169: Enable ASPM for selected NICs

On Thu, Aug 19, 2021 at 2:08 PM Heiner Kallweit <hkallweit1@...il.com> wrote:
>
> 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.

In case I make another mistake in next series, let me ask it more clearly...
What you meant was to check both link->aspm_enabled and link->aspm_support?

>
> > +     tp->rtl_aspm_supported = rtl_supports_aspm(tp);

Is rtl_supports_aspm() what you expect for the whitelist?
And what else am I missing?

Kai-Heng

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