netdev - Re: dst_ifdown breaks infiniband?

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Message-ID: <20070319151336.GA24225@mellanox.co.il>
Date:	Mon, 19 Mar 2007 17:13:36 +0200
From:	"Michael S. Tsirkin" <mst@....mellanox.co.il>
To:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc:	"Michael S. Tsirkin" <mst@....mellanox.co.il>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, general@...ts.openfabrics.org,
	Roland Dreier <rolandd@...co.com>,
	David Miller <davem@...emloft.net>
Subject: Re: dst_ifdown breaks infiniband?

> Quoting Alexey Kuznetsov <kuznet@....inr.ac.ru>:
> Subject: Re: dst_ifdown breaks infiniband?
> 
> Hello!
> 
> > infiniband sets parm->neigh_destructor, and I search for a way to prevent
> > this destructor from being called after the module has been unloaded.
> > Ideas?
> 
> It must be called in any case to update/release internal ipoib structures.

I don't think there's a problem.
All we do in destructor is release the ipoib_neigh resource.
And on device unregister we release all resources anyway.

> The idea is to move call of parm->neigh_destructor from neighbour destructor
> to the moment when it is unhashed, right after n->dead is set.
>
> infiniband is the only user (atm clip uses it too, but that use is obviously
> dummy), so that nobody will be harmed.

This might work. Could you post a patch to better show what you mean to do?

> But ipoib will have to check for validity of skb->dst->neighbour before
> attempt to reinitialize private data on dead (n->dead != 0) neighbour.

We set a flag before unregister_netdev and test it in start_xmit so
that's covered I think.

-- 
MST
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