linux-kernel - Re: [PATCH net 1/2] r8152: fix the sw rx checksum is unavailable

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Message-Id: <20161125.115827.2014848246966159357.davem@davemloft.net>
Date:   Fri, 25 Nov 2016 11:58:27 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     mlord@...ox.com
Cc:     greg@...ah.com, romieu@...zoreil.com, hayeswang@...ltek.com,
        netdev@...r.kernel.org, nic_swsd@...ltek.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH net 1/2] r8152: fix the sw rx checksum is unavailable

From: Mark Lord <mlord@...ox.com>
Date: Fri, 25 Nov 2016 07:49:35 -0500

> On 16-11-25 04:53 AM, Greg KH wrote:
>> On Thu, Nov 24, 2016 at 10:49:33PM -0500, Mark Lord wrote:
>>> There is no possibility for them to be used for anything other than
>>> USB receive buffers, for this driver only.  Nothing in the driver
>>> or kernel ever writes to those buffers after initial allocation,
>>> and only the driver and USB host controller ever have pointers to the buffers.
>> 
>> You really are going to have to break out that USB monitor to verify
>> that this is the data coming across the wire.
> 
> Not sure why, because there really is no other way for the data to
> appear where it does at the beginning of that URB buffer.
> 
> This does seem a rather unexpected burden to place upon someone
> reporting a regression in a USB network driver that corrupts user data.

If you are the only person who can actively reproduce this, which
seems to be the case right now, this is unfortunately the only way to
reach a proper analysis and fix.