netdev - Re: [PATCH 2/3] usbnet: add method for reporting speed without MDIO

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Date:   Thu, 7 Jan 2021 20:27:34 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Oliver Neukum <oneukum@...e.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, roland@...nel.org
Subject: Re: [PATCH 2/3] usbnet: add method for reporting speed without MDIO

On Thu, Jan 07, 2021 at 12:35:17PM +0100, Oliver Neukum wrote:

Hi Oliver

> +++ b/include/linux/usb/usbnet.h
> @@ -53,6 +53,8 @@ struct usbnet {
>  	u32			hard_mtu;	/* count any extra framing */
>  	size_t			rx_urb_size;	/* size for rx urbs */
>  	struct mii_if_info	mii;
> +	long			rxspeed;	/* if MII is not used */
> +	long			txspeed;	/* if MII is not used */

How generic is this really? I don't know USB networking, so i cannot
say for myself.

I'm wondering if these should be added to cdc_ncm_ctx, and
usbnet_get_link_ksettings_ncm function should be added?

Having said that, USB_CDC_NOTIFY_SPEED_CHANGE seems like it could also
use this. Should the patch set also handle that notification and set
usbnet->rxspeed and usbnet->txspeed? These would then be used in
multiple places and that would justify it being in struct usbnet.

       Andrew