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From: Matteo Croce <mcroce@redhat.com>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Stefan Chulski <stefanc@marvell.com>,
	"David S . Miller" <davem@davemloft.net>,
	Maxime Chevallier <maxime.chevallier@bootlin.com>,
	netdev <netdev@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Antoine Tenart <antoine.tenart@bootlin.com>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	"gregory.clement@bootlin.com" <gregory.clement@bootlin.com>,
	"miquel.raynal@bootlin.com" <miquel.raynal@bootlin.com>,
	Nadav Haklai <nadavh@marvell.com>,
	Marcin Wojtas <mw@semihalf.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [EXT] Re: [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts to handle RSS tables
Date: Sat, 9 May 2020 15:14:05 +0200	[thread overview]
Message-ID: <CAGnkfhx8fEZCoLPzGxSzQnj1ZWcQtBMn+g_jO1Jxc4zF7pQwjQ@mail.gmail.com> (raw)
In-Reply-To: <20200509114518.GB1551@shell.armlinux.org.uk>

On Sat, May 9, 2020 at 1:45 PM Russell King - ARM Linux admin
<linux@armlinux.org.uk> wrote:
>
> On Sat, May 09, 2020 at 11:15:58AM +0000, Stefan Chulski wrote:
> >
> >
> > > -----Original Message-----
> > > From: Matteo Croce <mcroce@redhat.com>
> > > Sent: Saturday, May 9, 2020 3:13 AM
> > > To: David S . Miller <davem@davemloft.net>
> > > Cc: Maxime Chevallier <maxime.chevallier@bootlin.com>; netdev
> > > <netdev@vger.kernel.org>; LKML <linux-kernel@vger.kernel.org>; Antoine
> > > Tenart <antoine.tenart@bootlin.com>; Thomas Petazzoni
> > > <thomas.petazzoni@bootlin.com>; gregory.clement@bootlin.com;
> > > miquel.raynal@bootlin.com; Nadav Haklai <nadavh@marvell.com>; Stefan
> > > Chulski <stefanc@marvell.com>; Marcin Wojtas <mw@semihalf.com>; Linux
> > > ARM <linux-arm-kernel@lists.infradead.org>; Russell King - ARM Linux admin
> > > <linux@armlinux.org.uk>
> > > Subject: [EXT] Re: [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts to
> > > handle RSS tables
> > >
> > > Hi,
> > >
> > > What do you think about temporarily disabling it like this?
> > >
> > > --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > > +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > > @@ -5775,7 +5775,8 @@ static int mvpp2_port_probe(struct platform_device
> > > *pdev,
> > >                             NETIF_F_HW_VLAN_CTAG_FILTER;
> > >
> > >         if (mvpp22_rss_is_supported()) {
> > > -               dev->hw_features |= NETIF_F_RXHASH;
> > > +               if (port->phy_interface != PHY_INTERFACE_MODE_SGMII)
> > > +                       dev->hw_features |= NETIF_F_RXHASH;
> > >                 dev->features |= NETIF_F_NTUPLE;
> > >         }
> > >
> > >
> > > David, is this "workaround" too bad to get accepted?
> >
> > Not sure that RSS related to physical interface(SGMII), better just remove NETIF_F_RXHASH as "workaround".
>
> Hmm, I'm not sure this is the right way forward.  This patch has the
> effect of disabling:
>
> d33ec4525007 ("net: mvpp2: add an RSS classification step for each flow")
>
> but the commit you're pointing at which caused the regression is:
>
> 895586d5dc32 ("net: mvpp2: cls: Use RSS contexts to handle RSS tables")
>
>

Hi,

When git bisect pointed to 895586d5dc32 ("net: mvpp2: cls: Use RSS
contexts to handle RSS tables"), which was merged
almost an year after d33ec4525007 ("net: mvpp2: add an RSS
classification step for each flow"), so I assume that between these
two commits either the feature was working or it was disable and we
didn't notice

Without knowing what was happening, which commit should my Fixes tag point to?

Regards,
-- 
Matteo Croce
per aspera ad upstream


  parent reply	other threads:[~2020-05-09 13:14 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-24 10:05 [PATCH net-next 0/5] net: mvpp2: Classifier updates, RSS Maxime Chevallier
2019-05-24 10:05 ` [PATCH net-next 1/5] net: mvpp2: cls: Use the correct number of rules in various places Maxime Chevallier
2019-05-24 10:05 ` [PATCH net-next 2/5] net: mvpp2: cls: Bypass C2 internals FIFOs at init Maxime Chevallier
2019-05-24 10:05 ` [PATCH net-next 3/5] net: mvpp2: cls: Use RSS contexts to handle RSS tables Maxime Chevallier
2020-04-13 23:43   ` Matteo Croce
2020-04-23 17:00     ` Russell King - ARM Linux admin
2020-05-09  0:12       ` Matteo Croce
2020-05-09 11:15         ` [EXT] " Stefan Chulski
2020-05-09 11:45           ` Russell King - ARM Linux admin
2020-05-09 12:16             ` Thomas Petazzoni
2020-05-09 12:48               ` Russell King - ARM Linux admin
2020-05-09 13:10                 ` Thomas Petazzoni
2020-05-09 13:14             ` Matteo Croce [this message]
2020-05-09 13:51               ` Russell King - ARM Linux admin
2020-05-09 14:48                 ` Russell King - ARM Linux admin
2020-05-09 15:31                   ` Matteo Croce
2020-05-09 19:52               ` Russell King - ARM Linux admin
2020-05-09 20:20                 ` Russell King - ARM Linux admin
2020-05-19  9:53                   ` Russell King - ARM Linux admin
2020-05-19 10:05                     ` Matteo Croce
2020-05-19 17:05                       ` Matteo Croce
2020-05-20 11:10                         ` Russell King - ARM Linux admin
2020-05-20 11:16                           ` Matteo Croce
2020-05-20 11:18                             ` Russell King - ARM Linux admin
2020-05-09 12:16           ` Matteo Croce
2020-05-09 12:31             ` Stefan Chulski
2020-05-09 13:25               ` Russell King - ARM Linux admin
2019-05-24 10:05 ` [PATCH net-next 4/5] net: mvpp2: cls: Extract the RSS context when parsing the ethtool rule Maxime Chevallier
2019-05-24 10:05 ` [PATCH net-next 5/5] net: mvpp2: cls: Support steering to RSS contexts Maxime Chevallier
2019-05-25 23:38 ` [PATCH net-next 0/5] net: mvpp2: Classifier updates, RSS David Miller

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