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Date:   Wed, 3 Nov 2021 10:41:06 +0100
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Erik Ekman <erik@kryo.se>
Cc:     stable@vger.kernel.org
Subject: Re: sfc: Fix reading non-legacy supported link modes
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On Tue, Nov 02, 2021 at 09:58:22PM +0100, Erik Ekman wrote:
> Upstream commit 041c61488236a5a84789083e3d9f0a51139b6edf
> 
> Initially this just fixed 50G and 100G modes which felt rare enough to
> not apply this to stable (also it got merged before I really had
> thought about it).
> 
> The testing mentioned in the change was actually from my development
> of c62041c5ba ("sfc: Export fibre-specific supported link modes"). I
> failed to mention the link between the two changes however and this
> commit ended up in net-next (just merged) while the second ended up in
> 5.15 via the net branch. The result is that for 5.15 even 10G cards
> only show 1G as supported:
> 
> $ ethtool ext
>     Settings for ext:
>     Supported ports: [ FIBRE ]
>     Supported link modes:   1000baseT/Full
>     Supported pause frame use: Symmetric Receive-only
> [..]
> 
> So this commit is needed at least for 5.15 to fix that.
> 
> Fixes:  c62041c5ba ("sfc: Export fibre-specific supported link modes")
> 
> It can also be applied further back if we want to fix the 50/100G
> modes (from v4.16 I believe):
> 
> Fixes: 5abb5e7f916 ("sfc: add bits for 25/50/100G supported/advertised speeds")

I have queued this up for 5.10.y, 5.14.y, and 5.15.y now, but I need a
backported version for 5.4.y and 4.19.y please.

thanks,

greg k-h