netdev - Re: [PATCH net-next 07/14] PCI: Add no PM reset quirk for NVIDIA Spectrum devices

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Date: Fri, 17 Nov 2023 15:21:56 +0000
From: Simon Horman <horms@...nel.org>
To: Petr Machata <petrm@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, Ido Schimmel <idosch@...dia.com>,
	Amit Cohen <amcohen@...dia.com>, mlxsw@...dia.com,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH net-next 07/14] PCI: Add no PM reset quirk for NVIDIA
 Spectrum devices

+ linux-pci@...r.kernel.org

On Wed, Nov 15, 2023 at 01:17:16PM +0100, Petr Machata wrote:
> From: Ido Schimmel <idosch@...dia.com>
> 
> Spectrum-{1,2,3,4} devices report that a D3hot->D0 transition causes a
> reset (i.e., they advertise NoSoftRst-). However, this transition does
> not have any effect on the device: It continues to be operational and
> network ports remain up. Advertising this support makes it seem as if a
> PM reset is viable for these devices. Mark it as unavailable to skip it
> when testing reset methods.
> 
> Before:
> 
>  # cat /sys/bus/pci/devices/0000\:03\:00.0/reset_method
>  pm bus
> 
> After:
> 
>  # cat /sys/bus/pci/devices/0000\:03\:00.0/reset_method
>  bus
> 
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Signed-off-by: Petr Machata <petrm@...dia.com>

Thanks,

my understanding is that this matches the use-case for which
quirk_no_pm_reset was introduced.

> ---
>  drivers/pci/quirks.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index ea476252280a..d208047d1b8f 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3786,6 +3786,19 @@ static void quirk_no_pm_reset(struct pci_dev *dev)
>  DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_ATI, PCI_ANY_ID,
>  			       PCI_CLASS_DISPLAY_VGA, 8, quirk_no_pm_reset);
>  
> +/*
> + * Spectrum-{1,2,3,4} devices report that a D3hot->D0 transition causes a reset
> + * (i.e., they advertise NoSoftRst-). However, this transition does not have
> + * any effect on the device: It continues to be operational and network ports
> + * remain up. Advertising this support makes it seem as if a PM reset is viable
> + * for these devices. Mark it as unavailable to skip it when testing reset
> + * methods.
> + */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0xcb84, quirk_no_pm_reset);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0xcf6c, quirk_no_pm_reset);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0xcf70, quirk_no_pm_reset);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0xcf80, quirk_no_pm_reset);
> +
>  /*
>   * Thunderbolt controllers with broken MSI hotplug signaling:
>   * Entire 1st generation (Light Ridge, Eagle Ridge, Light Peak) and part
> -- 
> 2.41.0
>