netdev - Re: [PATCH net-next v2 1/2] r8152: adjust generic_ocp

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Date: Wed, 26 Jul 2023 10:36:46 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Hayes Wang <hayeswang@...ltek.com>
Cc: kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
	nic_swsd@...ltek.com, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/2] r8152: adjust generic_ocp_write function

On Wed, Jul 26, 2023 at 11:08:07AM +0800, Hayes Wang wrote:
> Reduce the control transfer if all bytes of first or the last DWORD are
> written.
> 
> The original method is to split the control transfer into three parts
> (the first DWORD, middle continuous data, and the last DWORD). However,
> they could be combined if whole bytes of the first DWORD or last DWORD
> are written. That is, the first DWORD or the last DWORD could be combined
> with the middle continuous data, if the byte_en is 0xff.

How often is byte_en 0xff? Do you have some benchmark numbers to show
it is worth the complexity?

   Andrew