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

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Message-ID: <c63b0f24-4e6b-4df3-8783-9899d178b16e@lunn.ch>
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