netdev - Re: [RFC PATCH net-next 04/12] PCI: Add no PM reset quirk for NVIDIA Spectrum devices

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Message-ID: <ZTTb7KSgdQcvxdDq@shredder>
Date: Sun, 22 Oct 2023 11:23:08 +0300
From: Ido Schimmel <idosch@...dia.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: netdev@...r.kernel.org, linux-pci@...r.kernel.org, davem@...emloft.net,
	kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
	bhelgaas@...gle.com, alex.williamson@...hat.com, lukas@...ner.de,
	petrm@...dia.com, jiri@...dia.com, mlxsw@...dia.com
Subject: Re: [RFC PATCH net-next 04/12] PCI: Add no PM reset quirk for NVIDIA
 Spectrum devices

On Wed, Oct 18, 2023 at 02:40:41PM -0500, Bjorn Helgaas wrote:
> On Tue, Oct 17, 2023 at 10:42:49AM +0300, Ido Schimmel wrote:
> > Spectrum-{1,2,3,4} devices report that a D3hot->D0 transition causes a
> > reset (i.e., they advertise NoSoftRst-). However, this transition seems
> > to have no 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>
> 
> Hopefully since these are NVIDIA parts and you work at NVIDIA, this is
> stronger than "this transition *seems* to have no effect" :)

Yes. Reworded to "this transition does not have any effect on the
device" and kept your tag.

FYI, new devices will not advertise support for PM reset so I don't
expect this list to grow.