linux-kernel - Re: [PATCH v4 net-next 00/19] net: mvpp2: Add TX Flow Control support

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Date:   Thu, 28 Jan 2021 17:47:17 +0100
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Stefan Chulski <stefanc@...vell.com>,
        netdev <netdev@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>, nadavh@...vell.com,
        Yan Markman <ymarkman@...vell.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        atenart@...nel.org
Subject: Re: [PATCH v4 net-next 00/19] net: mvpp2: Add TX Flow Control support

czw., 28 sty 2021 o 17:43 Russell King - ARM Linux admin
<linux@...linux.org.uk> napisał(a):
>
> On Wed, Jan 27, 2021 at 01:43:16PM +0200, stefanc@...vell.com wrote:
> > Armada hardware has a pause generation mechanism in GOP (MAC).
> > The GOP generate flow control frames based on an indication programmed in Ports Control 0 Register. There is a bit per port.
> > However assertion of the PortX Pause bits in the ports control 0 register only sends a one time pause.
> > To complement the function the GOP has a mechanism to periodically send pause control messages based on periodic counters.
> > This mechanism ensures that the pause is effective as long as the Appropriate PortX Pause is asserted.
>
> I've tested this on my Macchiatobin SingleShot, which seems to be Ax
> silicon (and I've checked a couple of my other Armada 8040 platforms
> which are also Ax silicon too) and networking remains functional
> without flow control with the gigabit port achieving wire speed. I
> have not yet tested the 10G ports.
>
> --

Thanks Russell.

I'll stress and verify CN913x platform with the appropriate firmware.
This should happen after the weekend, as I don't have an immediate
access to our lab in order to replug the cables. I'll update here
about the results.

Best regards,
Marcin