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

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Message-ID: <X/tQo0uNFY63ra5R@lunn.ch>
Date:   Sun, 10 Jan 2021 20:08:19 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Stefan Chulski <stefanc@...vell.com>
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