netdev - Re: [PATCH net-next 2/8] devlink: add PF and VF port flavours

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Date:   Mon, 4 Mar 2019 08:30:18 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Parav Pandit <parav@...lanox.com>
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "oss-drivers@...ronome.com" <oss-drivers@...ronome.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/8] devlink: add PF and VF port flavours

Mon, Mar 04, 2019 at 05:59:04AM CET, parav@...lanox.com wrote:
>
>
>> -----Original Message-----
>> From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org> On
>> Behalf Of Jiri Pirko
>> Sent: Wednesday, February 27, 2019 6:17 AM
>> To: Jakub Kicinski <jakub.kicinski@...ronome.com>
>> Cc: davem@...emloft.net; oss-drivers@...ronome.com;
>> netdev@...r.kernel.org
>> Subject: Re: [PATCH net-next 2/8] devlink: add PF and VF port flavours
>> 
>> Tue, Feb 26, 2019 at 07:24:30PM CET, jakub.kicinski@...ronome.com wrote:
>> >Current port flavours cover simple switches and DSA.  Add PF and VF
>> >flavours to cover "switchdev" SR-IOV NICs.
>> >
>> >Example devlink user space output:
>> >
>> >$ devlink port
>> >pci/0000:82:00.0/0: type eth netdev p4p1 flavour physical
>> >pci/0000:82:00.0/10000: type eth netdev eth0 flavour pcie_pf pf 0
>> >pci/0000:82:00.0/10001: type eth netdev eth1 flavour pcie_vf pf 0 vf 0
>> >pci/0000:82:00.0/10002: type eth netdev eth2 flavour pcie_vf pf 0 vf 1
>>
>A given port is of its parent device.
>In current scenario, its PF or VF.
>Hence it should be device attribute and not a port attribute.

I think that this works. You have VF_rep ports, PF_rep ports and
PHYSICAL ports. In mlxsw for example, there are only PHYSICAL ports.
In sr-iov world, there is also a PHYSICAL port on the eswitch. The
others are either facing PF of VF. Looks accurate. I don't see any need
for "devlink dev" flavour.


>So devlink dev show command have to show what device flavour is.
>Is it well known PCI VF or PF or something else.
>It will show subdev device attribute and its parent PCI (PF/VF) devlink device.
>So we should have device flovour as PCI_PF or PCI_VF or SUBDEV.
>
>Again VF number showcasing here is very restrictive model.
>Every PF/VF/Subdev represents its own 'port' and it is connected to eswitch 'port'.
>Instead of showing VF here, it must be this 'port' or 'link' number that gives right view.
>Which netdev represents which VF is already linked in the VF rep-netdev sysfs property.

I think you confuse the eswtich ports (in Jakub's output it's them) and
the actual VF.


>
>So flavour should be something like 'hostport' and when port is registered for the eswitch side it should be 'switchport'.
>With this there is very clear picture of which hostport is connected to which eswitch port.
>Just like how we see in the physical world.
>