RE: [PATCH net-next v3 0/6] provide generic net selftest support

From: Joakim Zhang
Date: Tue Apr 27 2021 - 00:48:51 EST


> -----Original Message-----
> From: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
> Sent: 2021年4月23日 12:37
> To: Joakim Zhang <qiangqing.zhang@xxxxxxx>
> Cc: Shawn Guo <shawnguo@xxxxxxxxxx>; Sascha Hauer
> <s.hauer@xxxxxxxxxxxxxx>; Andrew Lunn <andrew@xxxxxxx>; Florian Fainelli
> <f.fainelli@xxxxxxxxx>; Heiner Kallweit <hkallweit1@xxxxxxxxx>; Fugang
> Duan <fugang.duan@xxxxxxx>; kernel@xxxxxxxxxxxxxx;
> netdev@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>; Fabio
> Estevam <festevam@xxxxxxxxx>; David Jander <david@xxxxxxxxxxx>; Russell
> King <linux@xxxxxxxxxxxxxxx>; Philippe Schenker
> <philippe.schenker@xxxxxxxxxxx>
> Subject: Re: [PATCH net-next v3 0/6] provide generic net selftest support
>
> Hi Joakim,
>
> On Fri, Apr 23, 2021 at 03:18:32AM +0000, Joakim Zhang wrote:
> >
> > Hi Oleksij,
> >
> > I look both stmmac selftest code and this patch set. For stmmac, if PHY
> doesn't support loopback, it will fallthrough to MAC loopback.
> > You provide this generic net selftest support based on PHY loopback, I have a
> question, is it possible to extend it also support MAC loopback later?
>
> Yes. If you have interest and time to implement it, please do.
> It should be some kind of generic callback as phy_loopback() and if PHY and
> MAC loopbacks are supported we need to tests both variants.
Hi Oleksij,

Yes, I can try to implement it when I am free, but I still have some questions:
1. Where we place the generic function? Such as mac_loopback().
2. MAC is different from PHY, need program different registers to enable loopback on different SoCs, that means we need get MAC private data from "struct net_device".
So we need a callback for MAC drivers, where we extend this callback? Could be "struct net_device_ops"? Such as ndo_set_loopback?

Best Regards,
Joakim Zhang
> Best regards,
> Oleksij
>
> > > -----Original Message-----
> > > From: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
> > > Sent: 2021年4月19日 21:01
> > > To: Shawn Guo <shawnguo@xxxxxxxxxx>; Sascha Hauer
> > > <s.hauer@xxxxxxxxxxxxxx>; Andrew Lunn <andrew@xxxxxxx>; Florian
> > > Fainelli <f.fainelli@xxxxxxxxx>; Heiner Kallweit
> > > <hkallweit1@xxxxxxxxx>; Fugang Duan <fugang.duan@xxxxxxx>
> > > Cc: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>; kernel@xxxxxxxxxxxxxx;
> > > netdev@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> > > linux-kernel@xxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>;
> > > Fabio Estevam <festevam@xxxxxxxxx>; David Jander
> > > <david@xxxxxxxxxxx>; Russell King <linux@xxxxxxxxxxxxxxx>; Philippe
> > > Schenker <philippe.schenker@xxxxxxxxxxx>
> > > Subject: [PATCH net-next v3 0/6] provide generic net selftest
> > > support
> > >
> > > changes v3:
> > > - make more granular tests
> > > - enable loopback for all PHYs by default
> > > - fix allmodconfig build errors
> > > - poll for link status update after switching to the loopback mode
> > >
> > > changes v2:
> > > - make generic selftests available for all networking devices.
> > > - make use of net_selftest* on FEC, ag71xx and all DSA switches.
> > > - add loopback support on more PHYs.
> > >
> > > This patch set provides diagnostic capabilities for some iMX, ag71xx
> > > or any DSA based devices. For proper functionality, PHY loopback support is
> needed.
> > > So far there is only initial infrastructure with basic tests.
> > >
> > > Oleksij Rempel (6):
> > > net: phy: execute genphy_loopback() per default on all PHYs
> > > net: phy: genphy_loopback: add link speed configuration
> > > net: add generic selftest support
> > > net: fec: make use of generic NET_SELFTESTS library
> > > net: ag71xx: make use of generic NET_SELFTESTS library
> > > net: dsa: enable selftest support for all switches by default
> > >
> > > drivers/net/ethernet/atheros/Kconfig | 1 +
> > > drivers/net/ethernet/atheros/ag71xx.c | 20 +-
> > > drivers/net/ethernet/freescale/Kconfig | 1 +
> > > drivers/net/ethernet/freescale/fec_main.c | 7 +
> > > drivers/net/phy/phy.c | 3 +-
> > > drivers/net/phy/phy_device.c | 35 +-
> > > include/linux/phy.h | 1 +
> > > include/net/dsa.h | 2 +
> > > include/net/selftests.h | 12 +
> > > net/Kconfig | 4 +
> > > net/core/Makefile | 1 +
> > > net/core/selftests.c | 400
> > > ++++++++++++++++++++++
> > > net/dsa/Kconfig | 1 +
> > > net/dsa/slave.c | 21 ++
> > > 14 files changed, 500 insertions(+), 9 deletions(-) create mode
> > > 100644 include/net/selftests.h create mode 100644
> > > net/core/selftests.c
> > >
> > > --
> > > 2.29.2
> >
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