netdev - Re: [PATCH net-next v2 3/5] net: phy: Add pluming for ethtool_{get,set}

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Message-ID: <0746c819-b44d-4096-81f4-8946e2f5f7a2@intel.com>
Date: Fri, 27 Oct 2023 09:57:07 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>, <netdev@...r.kernel.org>
CC: 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>, Andrew Lunn
	<andrew@...n.ch>, 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 3/5] net: phy: Add pluming for
 ethtool_{get,set}_rxnfc



On 10/26/2023 4:32 PM, Florian Fainelli wrote:
> On 10/26/23 16:20, Jacob Keller wrote:
>>
>>
>> On 10/26/2023 3:45 PM, Florian Fainelli wrote:
>>> +EXPORT_SYMBOL(phy_ethtool_set_rxnfc);
>>> diff --git a/include/linux/phy.h b/include/linux/phy.h
>>> index 3cc52826f18e..03e7c6352aef 100644
>>> --- a/include/linux/phy.h
>>> +++ b/include/linux/phy.h
>>> @@ -1077,6 +1077,10 @@ struct phy_driver {
>>>   	int (*get_sqi)(struct phy_device *dev);
>>>   	/** @get_sqi_max: Get the maximum signal quality indication */
>>>   	int (*get_sqi_max)(struct phy_device *dev);
>>> +	/* Used for WAKE_FILTER programming only */
>>
>> Any particular reason this comment is required? I don't see it enforced
>> above so I'm curious.
> 
> The comment is not required, though I put it in there to help readers 
> understand that this is purely for use by Wake-on-LAN, since unlike a 
> MACs, PHYs are not capable of redirecting certain flows to certain 
> queues, too low in the packet processing that there is not a notion of a 
> queue at that point (FIFO yes, but not queue as in what the networking 
> stack wants to use).

Ah, right that makes sense. Thanks for the clarification.

Perhaps we could enforce that in the interface so that if something does
try to pass a different kind of filter to the phy_rxnfc it would fail or
complain somehow? Because that seems like it would be a programming mistake.

I guess with the current implementation you effectively rely on
returning -EOPNOTSUP for non-wake filters since the driver forwards the
filter to the PHY to check whether it can support it.

Thanks,
Jake