Re: [PATCH v3 net-next] net: phy: realtek: read actual speed on rtl8211f to detect downshift
From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Date: 2020-11-25 17:07:42
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On Thu, Nov 26, 2020 at 12:57:37AM +0800, Yonglong Liu wrote:
Hi, Antonio: Could you help to provide a downshift warning message when this happen? It's a little strange that the adv and the lpa support 1000M, but finally the link speed is 100M.
That is an identifying feature of downshift. Downshift can happen at either end of the link, and since we must not change the "Advertised link modes" since this is what userspace configured, if a downshift occurs at the local end, then you will get the ethtool output you provide, where the speed does not agree with the reported advertisements. You should already be getting a warning in the kernel log when this happens; phy_check_downshift() which is part of the phylib core code will check this every time the link comes up. You should already have a message "Downshift occurred ..." in your kernel log. Please check. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!