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

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Date:   Fri, 13 Aug 2021 18:11:06 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     nic_swsd <nic_swsd@...ltek.com>,
        "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 Fri, Aug 13, 2021 at 3:39 AM Heiner Kallweit <hkallweit1@...il.com> wrote:
>
> 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).

So can we also remove aspm_manageable since blacklist will be used?

Kai-Heng

>
> > +             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);
> >
>