netdev - Re: BUG: sky2: hw csum failure with dual-port copper NIC on SMP

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Message-ID: <473A2BC8.7000909@cybernetics.com>
Date:	Tue, 13 Nov 2007 17:57:12 -0500
From:	Tony Battersby <tonyb@...ernetics.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	netdev@...r.kernel.org
Subject: Re: BUG: sky2: hw csum failure with dual-port copper NIC on SMP

Stephen Hemminger wrote:
> I can reproduce the problem under load with only a single port on 2.6.23.
> I haven't been able to reproduce it on 2.6.24-rc2 (latest) but that maybe
> because of either insufficient stress or another bug fix correcting the
> problem.  There is an issue with Yukon XL updating the receive status index
> before updating the receive status structure, that is now fixed in 2.6.24.
> The fix is:
>
> commit ab5adecb2d02f3688719dfb5936a82833fcc3955
> Author: Stephen Hemminger <shemminger@...ux-foundation.org>
> Date:   Mon Nov 5 15:52:09 2007 -0800
>
>     sky2: status ring race fix
>     
>     The D-Link PCI-X board (and maybe others) can lie about status
>     ring entries. It seems it will update the register for last status
>     index before completing the DMA for the ring entry. To avoid reading
>     stale data, zap the old entry and check.
>     
>     Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
>     Signed-off-by: Jeff Garzik <jeff@...zik.org>
The kernel I tested (2.6.24-rc2-git3) has this patch in it already.
Perhaps that is why the problem happens less frequently with that
kernel, but it didn't fix it entirely.

Do you want the test program I am using? It is a pretty basic
send()/recv() program, ~650 lines of C.

Tony

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