netdev - Re: [PATCHv3] Add missing memory barriers to clean_rx

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Message-ID: <AANLkTim5WdY6GVNXV1ZRVhF0AvSmZwoySg+CPx7sL4s7@mail.gmail.com>
Date:	Tue, 27 Jul 2010 16:08:19 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Sonny Rao <sonnyrao@...ibm.com>
Cc:	netdev@...r.kernel.org, e1000-devel@...ts.sf.net
Subject: Re: [PATCHv3] Add missing memory barriers to clean_rx_irq functions 
	in Intel Drivers

On Tue, Jul 27, 2010 at 16:05, Sonny Rao <sonnyrao@...ibm.com> wrote:
> On Tue, Jul 27, 2010 at 03:45:42PM -0700, Jeff Kirsher wrote:
>>
>> You also seem to be missing igb.
>
> This patch is similar to what was fixed in ixgbe in this patch:
>
> http://marc.info/?l=e1000-devel&m=126593062701537&w=3
>
> We should add read memory barriers to all the similar cases across the
> Intel ethernet driver family.  In the case of ixgbevf, igb, and igbvf
> I've also added a missing barrier to the clean_tx_irq path because I
> missed it in my last patch.
>
> Without the barrier a processor can speculate a load ahead of the load
> which looks at the status bit and get stale information causing a
> number of different issues including invalid packet length, NULL
> pointers, or bad data since checksumming was assumed to be done
> in hardware.
>
> v2: I missed the e100 the first time
> v3: I missed igb and igbvf, third time's the charm?
>
> Signed-off-by: Milton Miller <miltonm@....com>
> Signed-off-by: Sonny Rao <sonnyrao@...ibm.com>
> cc: stable <stable@...nel.org>
>

Thanks, I have added the patch to my queue.

-- 
Cheers,
Jeff
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