linux-kernel - Re: [EXT] Re: [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts to handle RSS tables

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Date:   Sat, 9 May 2020 14:25:24 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Stefan Chulski <stefanc@...vell.com>
Cc:     Matteo Croce <mcroce@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [EXT] Re: [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts
 to handle RSS tables

On Sat, May 09, 2020 at 12:31:21PM +0000, Stefan Chulski wrote:
> > -----Original Message-----
> > From: Matteo Croce <mcroce@...hat.com>
> > Sent: Saturday, May 9, 2020 3:16 PM
> > To: Stefan Chulski <stefanc@...vell.com>
> > Cc: David S . Miller <davem@...emloft.net>; Maxime Chevallier
> > <maxime.chevallier@...tlin.com>; netdev <netdev@...r.kernel.org>; LKML
> > <linux-kernel@...r.kernel.org>; Antoine Tenart
> > <antoine.tenart@...tlin.com>; Thomas Petazzoni
> > <thomas.petazzoni@...tlin.com>; gregory.clement@...tlin.com;
> > miquel.raynal@...tlin.com; Nadav Haklai <nadavh@...vell.com>; Marcin
> > Wojtas <mw@...ihalf.com>; Linux ARM <linux-arm-
> > kernel@...ts.infradead.org>; Russell King - ARM Linux admin
> > <linux@...linux.org.uk>
> > Subject: Re: [EXT] Re: [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts to
> > handle RSS tables
> > 
> > Hi,
> > 
> > The point is that RXHASH works fine on all interfaces, but on the gigabit one
> > (eth2 usually).
> > And on the 10 gbit interface is very very effective, the throughput goes 4x when
> > enabled, so it would be a big drawback to disable it on all interfaces.
> > 
> > Honestly I don't have any 2.5 gbit hardware to test it on eth3, so I don't know if
> > rxhash actually only works on the first interface of a unit (so eth0 and eth1), or
> > if it just doesn't work on the gigabit one.
> > 
> > If someone could test it on the 2.5 gbit port, this will be helpful.
> 
> RSS tables is part of Packet Processor IP, not MAC(so it's not related to specific speed). Probably issue exist on specific packet processor ports.
> Since RSS work fine on first port of the CP, we can do the following:
> if (port-> id == 0)
> 	dev->hw_features |= NETIF_F_RXHASH;

I can confirm that Macchiatobin Single Shot eth0 port works with a
1G Fibre SFP or 10G DA SFP with or without rxhash on.

So it seems Stefan's hunch that it is port related is correct.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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