netdev - Re: Q: force netif ON even when there is no real link ?

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Message-ID: <CAJ2oMhKCq73QSPH7zWCBMbxOMxcij9vE+ovdhN=ueEBKXsZabA@mail.gmail.com>
Date:   Fri, 20 Apr 2018 15:14:46 +0300
From:   Ran Shalit <ranshalit@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org
Subject: Re: Q: force netif ON even when there is no real link ?

On Fri, Apr 20, 2018 at 3:05 PM, Andrew Lunn <andrew@...n.ch> wrote:
> On Fri, Apr 20, 2018 at 03:01:09PM +0300, Ran Shalit wrote:
>> On Fri, Apr 20, 2018 at 2:55 PM, Andrew Lunn <andrew@...n.ch> wrote:
>> > On Fri, Apr 20, 2018 at 11:44:14AM +0300, Ran Shalit wrote:
>> >> Hello,
>> >>
>> >> We configure external switch in u-boot.
>> >> The configuration is through mdio (cpu is mac and switch is phy).
>> >>
>> >> But in Linux we rather not implement any communication in mdio to
>> >> switch, but it means that we then don't have the information of link
>> >> state.
>> >>
>> >> Is it possible to force in Linux (by default in startup) Ethernet
>> >> connectivity (netif_carrier_on, netif_wake_queue) even if there is no
>> >> information of real link state ?
>> >
>> > Hi Ran
>> >
>> > Use a fixed-phy.
>> >
>>
>> Hi Andrew,
>>
>> I'll check about fixed phy,
>> but in general, is it a problem to have always netif_carrier_on, even
>> when there is no link ?
>
> The link between the CPU and the switch should be up all the
> time. That is the point of fixed-link.
>

I understand.
But what about the mac driver,  does it just do netif_start_queue ?

Thanks


>     Andrew