netdev - Re: [PATCH net-next v4 1/6] net: ethtool: allow symmetric-xor RSS hash for any flow type

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Message-ID: <20231017131957.200bbb7e@kernel.org>
Date: Tue, 17 Oct 2023 13:19:57 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Alexander Duyck <alexander.duyck@...il.com>
Cc: Ahmed Zaki <ahmed.zaki@...el.com>, netdev@...r.kernel.org,
 intel-wired-lan@...ts.osuosl.org, corbet@....net,
 jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
 davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
 vladimir.oltean@....com, andrew@...n.ch, horms@...nel.org,
 mkubecek@...e.cz, willemdebruijn.kernel@...il.com,
 linux-doc@...r.kernel.org, Wojciech Drewek <wojciech.drewek@...el.com>
Subject: Re: [PATCH net-next v4 1/6] net: ethtool: allow symmetric-xor RSS
 hash for any flow type

On Tue, 17 Oct 2023 13:03:39 -0700 Alexander Duyck wrote:
> > > My thought would be to possibly just look at reducing your messaging
> > > to a warning from the driver if the inputs are not symmetric, but you
> > > have your symmetric xor hash function enabled.  
> >
> > With the restrictions (to be moved into ice_ethtool), the user is unable
> > to use non-symmetric inputs.  
> 
> I think a warning would make more sense than an outright restriction.
> You could warn on both the enabling if the mask is already unbalanced,
> or you could warn if the mask is set to be unbalanced after enabling
> your hashing.

Either it's a valid configuration or we should error out in the core.
Keep in mind that we can always _loosen_ the restriction, like you
asked for VLAN ID, but we can never _tighten_ it without breaking uAPI.
So error.