Re: [E1000-devel] Clean TX ring when link down.

[Mattias B. <mba...@ac...>]

Thanks a lot for your guidance, Alex.

On Thu, Jul 21, 2016 at 6:22 PM, Alexander Duyck <ale...@gm...>
wrote:

> On Wed, Jul 20, 2016 at 11:16 PM, Mattias Barthel <mba...@ac...>
> wrote:
> > Hello,
> >
> > I am using the HW timestamp all RX packets option in the I350 for my
> > special application.
> > There is a requirement to keep the HW timestamping clock intact if the
> link
> > goes down.
> > Now, if the link goes down, the IGB watchdog checks the TX ring and of
> > there are some used descriptors in it, the entire adapter is reset.
>
> The problem is that there is no other way to flush out the Tx FIFOs on
> the device other than resetting it.  That is the reason for resetting
> the interface if there are Tx frames still on the ring.
>
> > I am suggesting to just clean the TX ring in question of this occurs. Do
> > you have any strong recommendations against this?
>
> If you don't reset the ring what you run the risk of is a data
> corruption and/or Tx hang when the link comes back up.
>
> - Alex
>

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