netdev - Re: [PATCH 0/4] RFC CPSW switchdev mode

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Date:   Tue, 5 Jun 2018 23:28:40 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Ivan Vecera <ivecera@...hat.com>,
        Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
        ivan.khoronzhuk@...aro.org, nsekhar@...com,
        francois.ozog@...aro.org, yogeshs@...com, spatton@...com
Subject: Re: [PATCH 0/4] RFC CPSW switchdev mode

> I hope you are right - question is always in number of available options
> and which one to select - and, most important, explain it to the end user :( 

The end customer being ptp4linux? At least for Marvell switches, it is
happy about everything except that the switch is a bit slow, so we
need to modify some of the time outs in the configuration file.

> For example:
> phc_index is returned as part of .get_ts_info() = cpsw_get_ts_info(),
> so which intf should return phc_index?

It is not a 1:1 relationship. See:

https://elixir.bootlin.com/linux/latest/source/drivers/net/dsa/mv88e6xxx/hwtstamp.c#L61

All interfaces return the same index.

In fact, for a switch, having a PHC per port would be odd. That would
mean you need to sync the PHCs in order to act as a boundary clock.

    Andrew