linux-kernel - Re: [PATCH net-next v8 6/9] net: phy: c22: migrate to genphy_c45_write_eee

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Date:   Fri, 24 Feb 2023 19:36:46 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>, Arun.Ramadoss@...rochip.com,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, UNGLinuxDriver@...rochip.com,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, Wei Fang <wei.fang@....com>,
        kernel@...gutronix.de, intel-wired-lan@...ts.osuosl.org,
        Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <olteanv@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH net-next v8 6/9] net: phy: c22: migrate to
 genphy_c45_write_eee_adv()

On Fri, Feb 24, 2023 at 09:41:32AM -0800, Guenter Roeck wrote:
> On Fri, Feb 24, 2023 at 05:52:13PM +0100, Oleksij Rempel wrote:
> > On Fri, Feb 24, 2023 at 08:00:57AM -0800, Guenter Roeck wrote:
> > > On 2/23/23 20:53, Oleksij Rempel wrote:
> > > > Hallo Guenter,
> > > > 
> > > > On Thu, Feb 23, 2023 at 08:16:04PM -0800, Guenter Roeck wrote:
> > > > > On Thu, Feb 23, 2023 at 07:55:55PM -0800, Guenter Roeck wrote:
> > > > > > On Sat, Feb 11, 2023 at 08:41:10AM +0100, Oleksij Rempel wrote:
> > > > > > > Migrate from genphy_config_eee_advert() to genphy_c45_write_eee_adv().
> > > > > > > 
> > > > > > > It should work as before except write operation to the EEE adv registers
> > > > > > > will be done only if some EEE abilities was detected.
> > > > > > > 
> > > > > > > If some driver will have a regression, related driver should provide own
> > > > > > > .get_features callback. See micrel.c:ksz9477_get_features() as example.
> > > > > > > 
> > > > > > > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> > > > > > > Reviewed-by: Andrew Lunn <andrew@...n.ch>
> > > > > > 
> > > > > > This patch causes network interface failures with all my xtensa qemu
> > > > > > emulations. Reverting it fixes the problem. Bisect log is attached
> > > > > > for reference.
> > > > > > 
> > > > > 
> > > > > Also affected are arm:cubieboard emulations, with same symptom.
> > > > > arm:bletchley-bmc emulations crash. In both cases, reverting this patch
> > > > > fixes the problem.
> > > > 
> > > > Please test this fixes:
> > > > https://lore.kernel.org/all/167715661799.11159.2057121677394149658.git-patchwork-notify@kernel.org/
> > > > 
> > > 
> > > Applied and tested
> > > 
> > > 77c39beb5efa (HEAD -> master) net: phy: c45: genphy_c45_ethtool_set_eee: validate EEE link modes
> > > 068a35a8d62c net: phy: do not force EEE support
> > > 66d358a5fac6 net: phy: c45: add genphy_c45_an_config_eee_aneg() function
> > > ecea1bf8b04c net: phy: c45: use "supported_eee" instead of supported for access validation
> > > 
> > > on top of
> > > 
> > > d2980d8d8265 (upstream/master, origin/master, origin/HEAD, local/master) Merge tag 'mm-nonmm-stable-2023-02-20-15-29' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
> > > 
> > > No change for xtensa and arm:cubieboard; network interfaces still fail.
> > 
> > Huh, interesting.
> > 
> > can you please send me the kernel logs.
> > 
> There is nothing useful there, or at least I don't see anything useful.
> The Ethernet interfaces (sun4i-emac for cubieboard and ethoc for xtensa)
> just don't come up.
> 
> Sample logs:
> 
> cubieboard:
> 
> https://kerneltests.org/builders/qemu-arm-v7-master/builds/531/steps/qemubuildcommand/logs/stdio
> 
> xtensa:
> 
> https://kerneltests.org/builders/qemu-xtensa-master/builds/2177/steps/qemubuildcommand/logs/stdio
> 
> and, for completeness, bletchley-bmc:
> 
> https://kerneltests.org/builders/qemu-arm-aspeed-master/builds/531/steps/qemubuildcommand/logs/stdio
> 
> Those logs are without the above set of patches, but I don't see a
> difference with the patches applied for cubieboard and xtensa. I
> started a complete test run (for all emulations) with the patches
> applied; that should take about an hour to complete. 
> I could also add some debug logging, but you'd have to give me
> some hints about what to add and where.

OK, interesting. These are emulated PHYs. QEMU seems to return 0 or
0xFFFF on unsupported registers. May be I'm wrong.
All EEE read/write accesses depend on initial capability read
genphy_c45_read_eee_cap1()

Can you please add this trace:

diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index f595acd0a895..67dac9f0e71d 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -799,6 +799,7 @@ static int genphy_c45_read_eee_cap1(struct phy_device *phydev)
         * (Register 3.20)
         */
        val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
+       printk("MDIO_PCS_EEE_ABLE = 0x%04x", val);
        if (val < 0)
                return val;

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