netdev - Re: [PATCH] net: remove LLTX in atl2 driver

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Message-ID: <48DC11F5.20900@redhat.com>
Date:	Thu, 25 Sep 2008 18:34:29 -0400
From:	Chris Snook <csnook@...hat.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	Kevin Hao <kexin.hao@...driver.com>,
	Jeff Garzik <jgarzik@...hat.com>,
	Jay Cliburn <jacliburn@...lsouth.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: remove LLTX in atl2 driver

Jeff Garzik wrote:
> Chris Snook wrote:
>> Kevin Hao wrote:
>>> When NETIF_F_LLTX is set, the atlx driver will use a private lock.
>>> But in recent kernels this implementation seems redundant and
>>> can cause problems where AF_PACKET sees things twice. Since
>>> NETIF_F_LLTX is marked as deprecated and shouldn't be used in
>>> new driver, this patch removes NETIF_F_LLTX and adds a mmiowb
>>> before sending packet.
>>>
>>> Signed-off-by: Kevin Hao <kexin.hao@...driver.com>
>>
>> Can you explain a bit more concretely the problem this solves, and 
>> your testing?  Ultimately we'll want to merge this code with the atl1 
>> code, so we need to be confident that we can and should make the same 
>> change there.
>>
>> -- Chris
>>
>>> ---
>>>  drivers/net/atlx/atl2.c |   24 +-----------------------
>>>  drivers/net/atlx/atl2.h |    1 -
>>>  2 files changed, 1 insertions(+), 24 deletions(-)
> 
> Not directly addressing your question, but LLTX is indeed deprecated and 
> in general we want to move away from it.
> 
>     Jeff

I'm all in favor of removing legacy cruft.  I want to know a little more about 
it so we can remove it from the atl1 code as well.  Ultimately most of this will 
be shared code.

-- Chris
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