netdev - RE: [PATCH net-next 08/12] r8152: support TSO

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Message-ID: <CF9EF717568D49DB858D5363B1099FC0@realtek.com.tw>
Date:	Tue, 4 Mar 2014 21:11:48 +0800
From:	hayeswang <hayeswang@...ltek.com>
To:	'David Laight' <David.Laight@...LAB.COM>, <netdev@...r.kernel.org>
CC:	<nic_swsd@...ltek.com>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: RE: [PATCH net-next 08/12] r8152: support TSO

 David Laight [mailto:David.Laight@...LAB.COM] 
> Sent: Tuesday, March 04, 2014 8:12 PM
> To: 'Hayes Wang'; netdev@...r.kernel.org
> Cc: nic_swsd@...ltek.com; linux-kernel@...r.kernel.org; 
> linux-usb@...r.kernel.org
> Subject: RE: [PATCH net-next 08/12] r8152: support TSO
> 
> From: Hayes Wang
> > Support scatter gather and TSO.
> > 
> > Adjust the tx checksum function and set the max gso size to fix the
> > size of the tx aggregation buffer.
> 
> There is little point supporting TSO unless the usb host controller
> supports arbitrary aligned scatter-gather.
> All you do is require that a large skb be allocated (that may well
> fail), and add it another data copy.

I think I have done it. For also working for EHCI usb host controller,
I allocate 16 KB continuous buffer and copy the fragmented packets to
it and bulk out the buffer.
 
Best Regards,
Hayes

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