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

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Message-ID: <2eeb8e24-4122-450b-adf5-8c8a746db518@broadcom.com>
Date: Thu, 26 Oct 2023 16:52:43 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Jacob Keller <jacob.e.keller@...el.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 5/5] net: bcmgenet: Interrogate PHY for
 WAKE_FILTER programming

On 10/26/23 16:23, Jacob Keller wrote:
> 
> 
> On 10/26/2023 3:45 PM, Florian Fainelli wrote:
>> Determine whether the PHY can support waking up from the user programmed
>> network filter, and if it can utilize it.
>>
> 
> Here, you're passing through to phy_ethtool_set_rxnfc, basically
> allowing the lower device to program the wakeup filter if its supported. Ok.
> 
> This almost feels like it would belong generally in the higher level
> ethtool code rather than in the driver?

Agreed, as Doug just pointed out to me, there is still an open question 
about reconciling the PHY and the MAC RXNFC spaces into a single 
ethtool_rxnfc structure.

An ideal goal is to have zero modifications to neither the MAC or the 
PHY drivers such that they can both work in their own spaces as if they 
were alone, or combined.

I suppose that if we get the number of supported rules from the MAC 
first, and then get the supported number of rules from the PHY next, we 
could do something like this:

rule index
| 0|
| .| -> MAC rules
|15|
|16| -> PHY rule

and each of the MAC or the PHY {get,set}_rxnfc() operate within a base 
rule number which is relative to their own space. So the MAC driver 
would continue to care about its (max..first) - base (0) range, and the 
PHY would care about (max..first) - base (16).

Though then the issue is discoverability, how do you know which rule 
location is backed by which hardware block. We could create an 
intermediate and inert rule at index 16 for instance that acts as a 
delimiter?

Or we could create yet another RX_CLS_LOC_* value that is "special" and 
can denote whether of the MAC or the PHY we should be targeting 
whichever is supported, but that does not usually lend itself to being 
logically ORed with the existing RX_CLS_LOC_* values. WDYT?

pw-bot: cr
-- 
Florian

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