netdev - Re: [PATCH V2 net 00/11] Extending the ena driver to support new features and enhance performance

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Date:   Fri, 7 Jun 2019 14:54:20 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     "Bshara, Nafea" <nafea@...zon.com>
Cc:     Jiri Pirko <jiri@...nulli.us>,
        David Woodhouse <dwmw2@...radead.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Jubran, Samih" <sameehj@...zon.com>, Andrew Lunn <andrew@...n.ch>,
        "Kiyanovski, Arthur" <akiyano@...zon.com>,
        "Bshara, Saeed" <saeedb@...zon.com>,
        "Tzalik, Guy" <gtzalik@...zon.com>,
        "Matushevsky, Alexander" <matua@...zon.com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        "Saidi, Ali" <alisaidi@...zon.com>,
        "Machulsky, Zorik" <zorik@...zon.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Wilson, Matt" <msw@...zon.com>,
        "Belgazal, Netanel" <netanel@...zon.com>,
        "Herrenschmidt, Benjamin" <benh@...zon.com>
Subject: Re: [PATCH V2 net 00/11] Extending the ena driver to support new
 features and enhance performance

On Fri, 7 Jun 2019 21:34:00 +0000, Bshara, Nafea wrote:
> On 6/7/19, 2:27 PM, "Jakub Kicinski" <jakub.kicinski@...ronome.com> wrote:
> 
>     On Thu, 6 Jun 2019 18:14:16 -0700, Jakub Kicinski wrote:
>     > On Fri, 7 Jun 2019 01:04:14 +0000, Bshara, Nafea wrote:  
>     > > On Jun 6, 2019, at 4:43 PM, Jakub Kicinski wrote:    
>     > > >>> Okay, then you know which one is which.  Are there multiple ENAs but
>     > > >>> one EFA?    
>     > > >> 
>     > > >> Yes,  very possible. Very common
>     > > >> 
>     > > >> Typical use case that instances have one ena for control plane, one
>     > > >> for internet facing , and one 100G ena that also have efa capabilities    
>     > > > 
>     > > > I see, and those are PCI devices..  Some form of platform data would
>     > > > seem like the best fit to me.  There is something called:
>     > > > 
>     > > > /sys/bus/pci/${dbdf}/label
>     > > > 
>     > > > It seems to come from some ACPI table - DSM maybe?  I think you can put
>     > > > whatever string you want there 🤔      
>     > > 
>     > > Acpi path won’t work, much of thee interface are hot attached, using
>     > > native pcie hot plug and acpi won’t be involved.     
>     > 
>     > Perhaps hotplug break DSM, I won't pretend to be an ACPI expert.  So you
>     > can find a way to stuff the label into that file from another source.
>     > There's also VPD, or custom PCI caps, but platform data generally seems
>     > like a better idea.  
>     
>     Jiri, do you have any thoughts about using phys_port_name for exposing
>     topology in virtual environments.  Perhaps that's the best fit on the
>     netdev side.  It's not like we want any other port name in such case,
>     and having it automatically appended to the netdev name may be useful.
>     
> any preference for that vs /sysfs ?

I think so.  For the topology (control, internal, external) I feel like
its a reasonable fit, and well supported by udev/systemd.  We use it for
appending port names of the switch today (p0, p1, p2, etc).  Jiri was
working on making the core kernel generate those automatically so lets
give him a chance to speak up.

For the ENA<>EFA link I think you may still need to resort to sysfs,
unless it can be somehow implied by the topology label?