netdev - Re: [RFC] switchdev: clarify ndo_get_phys_port

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Date:   Tue, 25 Jul 2017 11:22:41 -0400
From:   Andy Gospodarek <andy@...yhouse.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, Jiri Pirko <jiri@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Sathya Perla <sathya.perla@...adcom.com>,
        simon.horman@...ronome.com, davem@...emloft.net
Subject: Re: [RFC] switchdev: clarify ndo_get_phys_port_name() formats

On Mon, Jul 24, 2017 at 10:13:44PM -0700, Jakub Kicinski wrote:
> We are still in position where we can suggest uniform naming
> convention for ndo_get_phys_port_name().  switchdev.txt file
> already contained a suggestion of how to name external ports.
> Since the use of switchdev for SR-IOV NIC's eswitches is growing,
> establish a format for ports of those devices as well.
> 
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

This is a nice addition and I suspect there could be even more done to
update this file to cover the VF rep usage.

> ---
>  Documentation/networking/switchdev.txt | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/networking/switchdev.txt b/Documentation/networking/switchdev.txt
> index 3e7b946dea27..7c4b6025fb4b 100644
> --- a/Documentation/networking/switchdev.txt
> +++ b/Documentation/networking/switchdev.txt
> @@ -119,9 +119,17 @@ into 4 10G ports, resulting in 4 port netdevs, the device can give a unique
>  SUBSYSTEM=="net", ACTION=="add", ATTR{phys_switch_id}=="<phys_switch_id>", \
>  	ATTR{phys_port_name}!="", NAME="swX$attr{phys_port_name}"
>  
> -Suggested naming convention is "swXpYsZ", where X is the switch name or ID, Y
> -is the port name or ID, and Z is the sub-port name or ID.  For example, sw1p1s0
> -would be sub-port 0 on port 1 on switch 1.
> +Suggested formats of the port name returned by ndo_get_phys_port_name are:
> + - pA     for external ports;
> + - pAsB   for split external ports;
> + - pfC    for PF ports (so called PF representors);
> + - pfCvfD for VF ports (so called VF representors).

I hate to clutter this up, but might be also need to add:

 - pfCsB    for split PF ports (so called PF representors);
 - pfCsBvfD for split VF ports (so called VF representors).

or are we comfortable that these additions to the name for split ports
are implied?

> +Where A is the port name or ID; B is the sub-port name or ID; C is PCIe
> +Physical Function name or ID and D is PCIe Virtual Function name or ID.
> +
> +Suggested naming convention for switches is "swX", where X is the switch name
> +or ID, plus the port name.  For example, sw1p1s0 would be sub-port 0 on port 1
> +on switch 1.
>  
>  Port Features
>  ^^^^^^^^^^^^^