linux-kernel - Re: [PATCHv4 4/4] net: cdc_ether: record speed in status method

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Date:   Thu, 1 Apr 2021 00:43:43 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Grant Grundler <grundler@...omium.org>
Cc:     Oliver Neukum <oneukum@...e.com>, Jakub Kicinski <kuba@...nel.org>,
        Roland Dreier <roland@...nel.org>,
        nic_swsd <nic_swsd@...ltek.com>, netdev <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Grant Grundler <GrantGrundlergrundler@...omium.org>
Subject: Re: [PATCHv4 4/4] net: cdc_ether: record speed in status method

On Mon, Mar 29, 2021 at 07:16:51PM -0700, Grant Grundler wrote:
> From: Grant Grundler <Grant Grundler grundler@...omium.org>
> 
> Until very recently, the usbnet framework only had support functions
> for devices which reported the link speed by explicitly querying the
> PHY over a MDIO interface. However, the cdc_ether devices send
> notifications when the link state or link speeds change and do not
> expose the PHY (or modem) directly.
> 
> Support funtions (e.g. usbnet_get_link_ksettings_internal()) to directly
> query state recorded by the cdc_ether driver were added in a previous patch.
> 
> Instead of cdc_ether spewing the link speed into the dmesg buffer,
> record the link speed encoded in these notifications and tell the
> usbnet framework to use the new functions to get link speed/state.
> 
> User space can now get the most recent link speed/state using ethtool.
> 
> v4: added to series since cdc_ether uses same notifications
>     as cdc_ncm driver.
> 
> Signed-off-by: Grant Grundler <grundler@...omium.org>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew