netdev - Re: [patch net-next RFC 00/12] devlink: introduce port flavours and common phys_port

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Date:   Tue, 17 Apr 2018 16:23:48 +0300
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Linux Netdev List <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Ido Schimmel <idosch@...lanox.com>, mlxsw <mlxsw@...lanox.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Ganesh Goudar <ganeshgr@...lsio.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Pieter Jansen van Vuuren 
        <pieter.jansenvanvuuren@...ronome.com>,
        John Hurley <john.hurley@...ronome.com>,
        Dirk van der Merwe <dirk.vandermerwe@...ronome.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        David Ahern <dsahern@...il.com>, vijaya.guvva@...ium.com,
        "Burla, Satananda" <satananda.burla@...ium.com>,
        "Vatsavayi, Raghu" <raghu.vatsavayi@...ium.com>,
        "Manlunas, Felix" <felix.manlunas@...ium.com>,
        Andy Gospodarek <gospo@...adcom.com>,
        Sathya Perla <sathya.perla@...adcom.com>,
        vasundhara-v.volam@...adcom.com,
        Tariq Toukan <tariqt@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        ASAP_Direct_Dev@...lanox.com
Subject: Re: [patch net-next RFC 00/12] devlink: introduce port flavours and
 common phys_port_name generation

On Thu, Mar 22, 2018 at 1:55 PM, Jiri Pirko <jiri@...nulli.us> wrote:
> From: Jiri Pirko <jiri@...lanox.com>
>
> This patchset resolves 2 issues we have right now:
> 1) There are many netdevices / ports in the system, for port, pf, vf
>    represenatation but the user has no way to see which is which
> 2) The ndo_get_phys_port_name is implemented in each driver separatelly,
>    which may lead to inconsistent names between drivers.
>
> This patchset introduces port flavours which should address the first
> problem. I'm testing this with Netronome nfp hardware. When the user
> has 2 physical ports, 1 pf, and 4 vfs, he should see something like this:

J/J (Jiri/Jakub) --

re "2 physical ports, 1 pf, and 4 vfs" --- does NFP exposes one PF for
both physical ports?

FWIW note that in mlx5 and AFAIK any other device except for mlx4 (...)
folks have FPP (Function Per Port) scheme.

[..]

> The desired output should look like this:
> # devlink port
> pci/0000:05:00.0/0: type eth netdev enp5s0np0 flavour physical number 0
> pci/0000:05:00.0/1: type eth netdev enp5s0np1 flavour physical number 1
> pci/0000:05:00.0/2: type eth netdev enp5s0npf0 flavour pf_rep number 0
> pci/0000:05:00.0/3: type eth netdev enp5s0nvf0 flavour vf_rep number 0
> pci/0000:05:00.0/4: type eth netdev enp5s0nvf1 flavour vf_rep number 1
> pci/0000:05:00.0/5: type eth netdev enp5s0nvf2 flavour vf_rep number 2
> pci/0000:05:00.0/6: type eth netdev enp5s0nvf3 flavour vf_rep number 3
> As you can see, the netdev names are generated according to the flavour
> and port number. In case the port is split, the split subnumber is also included.

What is the purpose/role in getting dev link ports here? is it such
that @ the end
of the day the driver would do a devlink_port_get_phys_port_name() call in their
get phys port name ndo? or we buy more advantages out of doing so?

Or.