linux-kernel - Re: [PATCH net] net: mvpp2: cls: Add missing NETIF_F

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Message-ID: <20190509071408.23eae42a@bootlin.com>
Date:   Thu, 9 May 2019 07:14:08 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        thomas.petazzoni@...tlin.com, gregory.clement@...tlin.com,
        miquel.raynal@...tlin.com, nadavh@...vell.com, stefanc@...vell.com,
        mw@...ihalf.com, Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net] net: mvpp2: cls: Add missing NETIF_F_NTUPLE flag

Hello Jakub, David,

On Tue, 7 May 2019 10:28:03 -0700
Jakub Kicinski <jakub.kicinski@...ronome.com> wrote:

>> -	if (mvpp22_rss_is_supported())
>> +	if (mvpp22_rss_is_supported()) {
>>  		dev->hw_features |= NETIF_F_RXHASH;
>> +		dev->features |= NETIF_F_NTUPLE;  
>
>Hm, why not in hw_features?

Because as of today, there's nothing implemented to disable
classification offload in the driver, so the feature can't be toggled.

Is this an issue ? Sorry if I'm doing this wrong, but I didn't see any
indication that this feature has to be host-writeable.

I can make so that it's toggle-able, but it's not as straightforward as
we would think, since the classifier is also used for RSS (so, we can't
just disable the classifier as a whole, we would have to invalidate
each registered flow).

Thanks,

Maxime