netdev - Re: [PATCH net-next] nfp: make RSS can be switched on/off by ethtool

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Message-ID: <20220226092854.GA2253@nj-rack01-04.nji.corigine.com>
Date:   Sat, 26 Feb 2022 17:29:42 +0800
From:   Yinjun Zhang <yinjun.zhang@...igine.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Simon Horman <simon.horman@...igine.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        oss-drivers@...igine.com, Louis Peens <louis.peens@...igine.com>
Subject: Re: [PATCH net-next] nfp: make RSS can be switched on/off by ethtool

On Fri, Feb 25, 2022 at 07:48:09AM -0800, Jakub Kicinski wrote:
> On Fri, 25 Feb 2022 09:59:29 +0100 Simon Horman wrote:
> > From: Yinjun Zhang <yinjun.zhang@...igine.com>
> > 
> > RSS is default on in nfp net device, and cannot be switched off
> > by `ethtool -K <int> receive-hashing off`. Implement it now.
> 
> Does rxhash mean RSS or reporting of the flow hash?
> User can "disable RSS" by changing the indirection table to all-0.
> Currently rxhash controls copying the rxhash to the skb for the nfp.

Seems you're right. `rxhash` is to enable/disable rx hash offload only.
But it seems that some few nic vendors also use it as the switch of RSS.
Anyway, thanks for correction, please ignore this patch.