netdev - Phylink flow control support on ports with MLO_AN

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Message-ID: <CO6PR18MB38732F56EF08FA2C949326F9B0B79@CO6PR18MB3873.namprd18.prod.outlook.com>
Date:   Sun, 31 Jan 2021 10:12:25 +0000
From:   Stefan Chulski <stefanc@...vell.com>
To:     Russell King <rmk+kernel@...linux.org.uk>,
        "andrew@...n.ch" <andrew@...n.ch>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "Marcin Wojtas (mw@...ihalf.com)" <mw@...ihalf.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Yan Markman <ymarkman@...vell.com>
Subject: Phylink flow control support on ports with  MLO_AN_FIXED auto
 negotiation

Hi,

Armada has options for 1G/10G ports without PHY's(for example community board Macchiato single shot).
This port doesn't have PHY's and cannot negotiate Flow Control support, but we can for example connect two ports without PHY's and manually(by ethtool) configure FC.
Current phylink return error if I do this on ports with MLO_AN_FIXED(callback phylink_ethtool_set_pauseparam):
if (pl->cur_link_an_mode == MLO_AN_FIXED)
                return -EOPNOTSUPP;

How can we enable FC configurations for these ports? Do you have any suggestions or should I post my proposal as an RFC patch?

Thanks,
Stefan.