netdev - Re: [RFC PATCH net-next 0/2] Configuring PFC stall prevention via ethtool

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Message-ID: <20171116024429.GG2130@lunn.ch>
Date:   Thu, 16 Nov 2017 03:44:29 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Eran Ben Elisha <eranbe@...lanox.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        "John W. Linville" <linville@...driver.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Gal Pressman <galp@...lanox.com>,
        Ariel Almog <ariela@...lanox.com>,
        Inbar Karmy <inbark@...lanox.com>
Subject: Re: [RFC PATCH net-next 0/2] Configuring PFC stall prevention via
 ethtool

> What do other vendors support? Time? Number of pause frames sent?

So i checked a few Marvell Switches. You can also specify a time. It
is a little bit more complex than that, since the units of time depend
on the link speed. But converting a time in ms to what the register
wants is possible.

So i'm thinking rather than a poorly defined 'Auto', passing a time
would be better.

      Andrew