linux-kernel - Re: [PATCH net-next] eth: fbnic: Add PCIe hardware statistics

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Message-ID: <20241107082327.GI5006@unreal>
Date: Thu, 7 Nov 2024 10:23:27 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Andrew Lunn <andrew@...n.ch>, Bjorn Helgaas <helgaas@...nel.org>,
	Sanman Pradhan <sanman.p211993@...il.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, netdev@...r.kernel.org,
	alexanderduyck@...com, kernel-team@...a.com, davem@...emloft.net,
	edumazet@...gle.com, pabeni@...hat.com, horms@...nel.org,
	corbet@....net, mohsin.bashr@...il.com, sanmanpradhan@...a.com,
	andrew+netdev@...n.ch, vadim.fedorenko@...ux.dev,
	jdamato@...tly.com, sdf@...ichev.me, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH net-next] eth: fbnic: Add PCIe hardware statistics

On Wed, Nov 06, 2024 at 04:09:58PM -0800, Jakub Kicinski wrote:
> On Wed, 6 Nov 2024 18:36:16 +0100 Andrew Lunn wrote:
> > > How would this be done in the PCI core?  As far as I can tell, all
> > > these registers are device-specific and live in some device BAR.  
> > 
> > Is this a licences PCIe core?
> > 
> > Could the same statistics appear in other devices which licence the
> > same core? Maybe this needs pulling out into a helper?
> 
> The core is licensed but I believe the _USER in the defines names means
> the stats sit in the integration logic not the licensed IP. I could be
> wrong.
> 
> > If this is true, other uses of this core might not be networking
> > hardware, so ethtool -S would not be the best interfaces. Then they
> > should appear in debugfs?
> 
> I tried to push back on adding PCIe config to network tooling,
> and nobody listened. Look at all the PCI stuff in devlink params.
> Some vendors dump PCIe signal integrity into ethtool -S

Can you please give an example? I grepped various keywords and didn't
find anything suspicious.

Thanks