netdev - Re: [PATCH net-next 2/3] dt-bindings: net: cdns,macb: Add wol-arp-packet property

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Message-ID: <9b4a2c23-5a96-45eb-9bdf-cefc99f25fec@lunn.ch>
Date: Wed, 31 Jan 2024 14:18:39 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Vineeth Karumanchi <vineeth.karumanchi@....com>
Cc: nicolas.ferre@...rochip.com, claudiu.beznea@...on.dev,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	linux@...linux.org.uk, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	git@....com
Subject: Re: [PATCH net-next 2/3] dt-bindings: net: cdns,macb: Add
 wol-arp-packet property

On Wed, Jan 31, 2024 at 01:09:19PM +0530, Vineeth Karumanchi wrote:
> Hi Andrew,
> 
> 
> On 31/01/24 6:56 am, Andrew Lunn wrote:
> > On Tue, Jan 30, 2024 at 04:18:44PM +0530, Vineeth Karumanchi wrote:
> > > "wol-arp-packet" property enables WOL with ARP packet.
> > > It is an extension to "magic-packet for WOL.
> > 
> > It not clear why this is needed. Is this not a standard feature of the
> > IP? Is there no hardware bit indicating the capability?
> > 
> 
> WOL via both ARP and Magic packet is supported by the IP version on ZU+ and
> Versal. However, user can choose which type of packet to recognize as a WOL
> event - magic packet or ARP.

ethtool says:

           wol p|u|m|b|a|g|s|f|d...
                  Sets Wake-on-LAN options.  Not all devices support this.  The argument to this  option  is  a
                  string of characters specifying which options to enable.
                  p   Wake on PHY activity
                  u   Wake on unicast messages
                  m   Wake on multicast messages
                  b   Wake on broadcast messages
                  a   Wake on ARP
                  g   Wake on MagicPacket™
                  s   Enable SecureOn™ password for MagicPacket™
                  f   Wake on filter(s)
                  d   Disable  (wake  on  nothing).  This option
                      clears all previous options.

So why do we need a DT property?

	Andrew