netdev - Re: [PATCH] [RFC] net: phy: phy drivers should not set SUPPORTED_Pause or SUPPORTED_Asym

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Message-ID: <5818E2B0.80902@codeaurora.org>
Date:   Tue, 1 Nov 2016 13:45:04 -0500
From:   Timur Tabi <timur@...eaurora.org>
To:     Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] [RFC] net: phy: phy drivers should not set
 SUPPORTED_Pause or SUPPORTED_Asym_Pause

Florian Fainelli wrote:
> So in premise, this is good, and is exactly what I have in mind for the
> series that I am cooking, but if we apply this alone, without a change
> in drivers/net/phy/phy.c which adds SUPPORTED_Pause |
> SUPPORTED_AsymPause to phydev->features, we are basically breaking the
> Ethernet MAC drivers that don't explicitly override phydev->features and
> yet rely on that to get flow control to work.

That's what I figured, but I wasn't sure how to handle that.  However, 
isn't the ability to pass pause frames a feature that some PHYs do not 
have?  That is, does every PHY support bits 10 and 11 in register 4?

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