linux-kernel - Re: [PATCH net-next v2 5/5] net: bcmgenet: Interrogate PHY for WAKE

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Date:   Fri, 27 Oct 2023 20:31:02 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     Florian Fainelli <florian.fainelli@...adcom.com>,
        netdev@...r.kernel.org, Doug Berger <opendmb@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Tariq Toukan <tariqt@...dia.com>,
        Gal Pressman <gal@...dia.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Daniil Tatianin <d-tatianin@...dex-team.ru>,
        Simon Horman <horms@...nel.org>,
        Justin Chen <justin.chen@...adcom.com>,
        Ratheesh Kannoth <rkannoth@...vell.com>,
        Joe Damato <jdamato@...tly.com>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Jiri Pirko <jiri@...nulli.us>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2 5/5] net: bcmgenet: Interrogate PHY for
 WAKE_FILTER programming

> It does seem like an acceptable compromise here, and perhaps being
> driver specific is ok, since this does depend a lot on the individual
> device support, thus broadly applying this across all drivers could be
> problematic.

The Marvell PHYs have a similar capability. Its actually more feature
rich. It allows upto 8 matches, each being of up to 128 bytes, and you
can enable/disable each byte within the 128 bytes. This would in fact
be better for Florian's use case, since it could match deeper into the
frame and reduce the false positive. But its a Marvell device...

My real point is, other hardware does have similar capabilities. Its
unclear if anybody else will ever actually need it, but we should try
to avoid a one device solution.

   Andrew