netdev - Re: [RFC usbnet.c] - Add packet aggregation capability

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Date:	Thu, 11 Jun 2009 05:38:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dhollis@...ehollis.com
Cc:	david-b@...bell.net, netdev@...r.kernel.org, mark@...x.com.tw,
	donald@...x.com.tw, louis@...x.com.tw
Subject: Re: [RFC usbnet.c] - Add packet aggregation capability

From: David Hollis <dhollis@...ehollis.com>
Date: Wed, 10 Jun 2009 13:57:39 -0400

> One item that I have is how to handle the portion in usbnet_probe() that
> sets the hard_start_xmit handler with the change to netdevice_ops:
> 
> -	net->hard_start_xmit = usbnet_start_xmit;
> +	if (info->tx_gather)
> +		net->hard_start_xmit = usbnet_bundle_xmit;
> +	else
> +		net->hard_start_xmit = usbnet_start_xmit;
> 
> 
> Would it be the most appropriate to merge the
> usbnet_aggregate_skb_xmit() pieces into the existing usbnet_start_xmit
> with appropriate conditionals?

In the current tree you cannot even make this assignment.

Everything must go through a net_device_ops set of methods,
the pointer of which is const.
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