RE: [git patches] net driver updates

From: Krishna Kumar2
Date: Thu Feb 21 2008 - 01:03:44 EST


Hi Divy,

But the race doesn't exist even for LLTX drivers these days. There is no
way two cpu's can execute the xmit handler at the same time.

Thanks,

- KK

> > > > The first part of the patch removes the !netif_queue_stopped(dev).
> > > > It opens the race discussed a while ago between Stephen hemminger
> > and
> > > > David Miller:
> > > > http://marc.info/?l=linux-netdev&m=113383224512427&w=2
> > >
> > > I feel this race cannot happen anymore. I think the fix for that
> race
> > was
> > > to introduce the
> > > __LINK_STATE_QDISC_RUNNING bit thus eliminating any races between
> > CPU's. If
> > > one
> > > CPU has called xmit, the other CPU will enqueue skbs (by holding the
> > > queue_lock) and
> > > exit from qdisc_run since it finds the bit set already.
> >
> > And the race is talking about LLTX, which S2IO doesn't use as
> > far as I can tell.
>
> Dave,
>
> The driver is cxgb3 here, it uses LLTX.
>
> Cheers,
> Divy

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