netdev - Re: [NET] net: reorder struct net_device

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Message-ID: <87iqm4jr8z.fsf@nemi.mork.no>
Date:	Fri, 20 Mar 2009 13:47:08 +0100
From:	Bjørn Mork <bjorn@...k.no>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [NET] net: reorder struct net_device_ops

Eric Dumazet <dada1@...mosbay.com> writes:

> [NET] net: reorder struct net_device_ops
>
> Moving ndo_start_xmit() field at first position in
> struct net_device_ops reduce the assembly needed to compute
> the prefetch() address.

You can't do this while the compatibility code is still there.

from net/core/dev.c:register_netdevice() :

		/* This works only because net_device_ops and the
		   compatiablity structure are the same. */
		dev->netdev_ops = (void *) &(dev->init);


Bjørn
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