nve locking fixes round 2

[Bjoern A. Zeeb]

On Thu, 24 Nov 2005, Matthew Dillon wrote:

Hi,

> :Ok, now that the first set of locking overhaul is in the tree, can folks with
> :working nve(4) adapters test the patch referenced below and make sure there
> :are no regressions.  Having the IFF_UP fiddling turned off may or may not
> :help folks getting the TX timeouts as well, btw, so if people are feeling
> :brave they can try this patch as well.  Note it is only applicable to recent
> :current.
> :
> :http://www.FreeBSD.org/~jhb/patches/nve_locking.patch
> :
> :--
> :John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
> :"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
>
>    The reason I set sc->pending_txs to 0 in DFly after the reinit is
>    because when a watchdog timeout occurs and you reset the device,
>    *ALL* mbufs still sitting in the transmit ring are lost.  They will
>    never be acknowledged, ever.  So pending_txs will never drop back to 0 on
>    its own.  This is what led to continuous watchdog timeout reports
>    when, in fact, only one timeout actually occured.

the problem is that with some versions of the hardware you are not
even able to get the first packet out.

-- 
Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT