linux-kernel - RE: [EXT] Re: [PATCH RFC net-next 00/19] net: mvpp2: Add TX Flow Control support

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Date:   Sun, 10 Jan 2021 19:11:53 +0000
From:   Stefan Chulski <stefanc@...vell.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Nadav Haklai <nadavh@...vell.com>,
        Yan Markman <ymarkman@...vell.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mw@...ihalf.com" <mw@...ihalf.com>,
        "atenart@...nel.org" <atenart@...nel.org>
Subject: RE: [EXT] Re: [PATCH RFC net-next  00/19] net: mvpp2: Add TX Flow
 Control support

> 
> On Sun, Jan 10, 2021 at 06:55:11PM +0000, Stefan Chulski wrote:
> > > > not connected to the GOP flow control generation mechanism.
> > > > To solve this issue Armada has firmware running on CM3 CPU
> > > > dedectated for Flow Control support. Firmware monitors Packet
> > > > Processor resources and asserts XON/XOFF by writing to Ports Control 0
> Register.
> > >
> > > What is the minimum firmware version that supports this?
> > >
> >
> > Support were added to firmware about two years ago.
> > All releases from 18.09 should has it.
> 
> Can you query the firmware and ask its version? We should keep all this code
> disabled if the firmware it too old.
> 
>      Andrew

This is exactly what " net: mvpp2: add TX FC firmware check " patch do. If handshake of flow control support fail, FC won't be supported.

Stefan.