Andrew Lunn writes:
> It is called downshift. And we have support for it in the phylib core,
> if the PHY has the needed vendor register.
>
> https://elixir.bootlin.com/linux/v5.7-rc7/source/drivers/net/phy/phy-core.c#L341
> https://elixir.bootlin.com/linux/v5.7-rc7/source/drivers/net/phy/phy.c
On Thu, May 28, 2020 at 06:54:24PM +0200, Petr Machata wrote:
>
> Andrew Lunn writes:
>
> >> Andrew, pardon my ignorance in these matters, can a PHY driver in
> >> general determine that the issue is with the cable, even without running
> >> the fairly expensive cable test?
> >
> > No. To diagno
On Thu, May 28, 2020 at 06:54:24PM +0200, Petr Machata wrote:
> In another e-mail you suggested this:
>
> Link detected: no (cable issue)
>
> But if the link just silently falls back to 100Mbps, there would never
> be an opportunity for phy to actually report a down reason. So there
> probabl
Andrew Lunn writes:
>> Andrew, pardon my ignorance in these matters, can a PHY driver in
>> general determine that the issue is with the cable, even without running
>> the fairly expensive cable test?
>
> No. To diagnose a problem, you need the link to be idle. If the link
> peer is sending fra
> Andrew, pardon my ignorance in these matters, can a PHY driver in
> general determine that the issue is with the cable, even without running
> the fairly expensive cable test?
No. To diagnose a problem, you need the link to be idle. If the link
peer is sending frames, they interfere with TDR. So
On Thu, May 28, 2020 at 11:22:47AM +0200, Petr Machata wrote:
>
> Oleksij Rempel writes:
>
> > I would add some more reasons:
> > - master slave resolution issues: both link partners are master or
> > slave.
>
> I guess we should send the RFC, so that we can talk particulars. We
> currently d
Oleksij Rempel writes:
> I would add some more reasons:
> - master slave resolution issues: both link partners are master or
> slave.
I guess we should send the RFC, so that we can talk particulars. We
currently don't have anything like master/slave mismatch in the API, but
that's just becau
Amit Cohen writes:
> Andrew Lunn writes:
>
>>On Wed, May 27, 2020 at 03:41:22PM +, Amit Cohen wrote:
>>> Hi Andrew,
>>>
>>> We are planning to send a set that exposes link-down reason in ethtool.
>>>
>>> It seems that the ability of your set “Ethernet cable test support”
>>> can be integra
On Wed, May 27, 2020 at 03:41:22PM +, Amit Cohen wrote:
> Hi Andrew,
> We are planning to send a set that exposes link-down reason in ethtool.
> It seems that the ability of your set "Ethernet cable test support" can be
> integrated with link-down reason.
>
> The idea is to expose reason and
Andrew Lunn writes:
>On Wed, May 27, 2020 at 03:41:22PM +, Amit Cohen wrote:
>> Hi Andrew,
>>
>> We are planning to send a set that exposes link-down reason in ethtool.
>>
>> It seems that the ability of your set “Ethernet cable test support”
>> can be integrated with link-down reason.
>>
On Wed, May 27, 2020 at 03:41:22PM +, Amit Cohen wrote:
> Hi Andrew,
>
> We are planning to send a set that exposes link-down reason in ethtool.
>
> It seems that the ability of your set “Ethernet cable test support” can be
> integrated with link-down reason.
>
>
>
> The idea is to expose
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