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Message-ID: <84eb168e-58ff-0350-74e2-c55249eb258c@gmail.com>
Date: Tue, 8 Jun 2021 10:00:38 +0200
From: Heiner Kallweit <hkallweit1@...il.com>
To: Koba Ko <koba.ko@...onical.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] r8169: Use PHY_POLL when RTL8106E enable ASPM
On 08.06.2021 05:22, Koba Ko wrote:
> For RTL8106E, it's a Fast-ethernet chip.
> If ASPM is enabled, the link chang interrupt wouldn't be triggered
> immediately and must wait a very long time to get link change interrupt.
> Even the link change interrupt isn't triggered, the phy link is already
> established.
>
> Use PHY_POLL to watch the status of phy link and disable
> the link change interrupt when ASPM is enabled on RTL8106E.
>
> v2: Instead use PHY_POLL and identify 8106E by RTL_GIGA_MAC_VER_39.
>
Still the issue description doesn't convince me that it's a hw bug
with the respective chip version. What has been stated so far:
1. (and most important) Issue doesn't occur in mainline because ASPM
is disabled in mainline for r8169. Issue occurs only with a
downstream kernel with ASPM enabled for r8169.
2. Issue occurs only with ASPM L1.1 not disabled, even though this chip
version doesn't support L1 sub-states. Just L0s/L1 don't trigger
the issue.
The NIC doesn't announce L1.1 support, therefore PCI core won't
enable L1 sub-states on the PCIe link between NIC and upstream
PCI bridge.
3. Issue occurs only with a GBit-capable link partner. 100MBit link
partners are fine. Not clear whether issue occurs with a specific
Gbit link partner only or with GBit-capable link partners in general.
4. Only link-up interrupt is affected. Not link-down and not interrupts
triggered by other interrupt sources.
5. Realtek couldn't confirm that there's such a hw bug on RTL8106e.
One thing that hasn't been asked yet:
Does issue occur always if you re-plug the cable? Or only on boot?
I'm asking because in the dmesg log you attached to the bugzilla issue
the following looks totally ok.
[ 61.651643] r8169 0000:01:00.0 enp1s0: Link is Down
[ 63.720015] r8169 0000:01:00.0 enp1s0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 66.685499] r8169 0000:01:00.0 enp1s0: Link is Down
> Signed-off-by: Koba Ko <koba.ko@...onical.com>
> ---
> drivers/net/ethernet/realtek/r8169_main.c | 21 +++++++++++++++++++--
> 1 file changed, 19 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 2c89cde7da1e..a59cbaef2839 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -4914,6 +4914,19 @@ static const struct dev_pm_ops rtl8169_pm_ops = {
>
> #endif /* CONFIG_PM */
>
> +static int rtl_phy_poll_quirk(struct rtl8169_private *tp)
> +{
> + struct pci_dev *pdev = tp->pci_dev;
> +
> + if (!pcie_aspm_enabled(pdev))
That's the wrong call. According to what you said earlier you want to
check for L1 sub-states, not for ASPM in general.
> + return 0;
> +
> + if (tp->mac_version == RTL_GIGA_MAC_VER_39)
> + return 1;
> +
> + return 0;
> +}
> +
> static void rtl_wol_shutdown_quirk(struct rtl8169_private *tp)
> {
> /* WoL fails with 8168b when the receiver is disabled. */
> @@ -4991,7 +5004,10 @@ static const struct net_device_ops rtl_netdev_ops = {
>
> static void rtl_set_irq_mask(struct rtl8169_private *tp)
> {
> - tp->irq_mask = RxOK | RxErr | TxOK | TxErr | LinkChg;
> + tp->irq_mask = RxOK | RxErr | TxOK | TxErr;
> +
> + if (!rtl_phy_poll_quirk(tp))
> + tp->irq_mask |= LinkChg;
>
> if (tp->mac_version <= RTL_GIGA_MAC_VER_06)
> tp->irq_mask |= SYSErr | RxOverflow | RxFIFOOver;
> @@ -5085,7 +5101,8 @@ static int r8169_mdio_register(struct rtl8169_private *tp)
> new_bus->name = "r8169";
> new_bus->priv = tp;
> new_bus->parent = &pdev->dev;
> - new_bus->irq[0] = PHY_MAC_INTERRUPT;
> + new_bus->irq[0] =
> + (rtl_phy_poll_quirk(tp) ? PHY_POLL : PHY_MAC_INTERRUPT);
> snprintf(new_bus->id, MII_BUS_ID_SIZE, "r8169-%x", pci_dev_id(pdev));
>
> new_bus->read = r8169_mdio_read_reg;
>
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