Bug 209235 – e1000e doesn't strip crc properly on some chips

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description Johan Ymerson 2008-02-07 13:19:26 UTC]

The e1000e driver in kernel 2.6.24 doesn't strip crc properly from ethernet frames on some chips. This makes it impossible to use these nics in bridges, as the bridge depends on the crc to be stripped.

Upstream is working on this problem, but it will probably take a while since it isn't clear why some chips (in my case 82566DM-2) behave like this.

I suggest applying the attached patch to revert to an old working behavior of this driver. (i.e. reverting commit 140a74802894e9db57e5cd77ccff77e590ece5f3.)



Reproducible: Always

Steps to Reproduce:
1. Use tcpdump to see the ethernet frame size or include the e1000e nic in a bridge.
2.
3.

Actual Results:  
Driver doesn't strip crc from ethernet frame.

Expected Results:  
Driver should strip crc from ethernet frame.

[Comment 1 Johan Ymerson 2008-02-07 13:20:32 UTC]

Created attachment 142884 [details, diff]
Temporary fix for e1000e crc problem.

[Comment 2 Daniel Drake (RETIRED) 2008-02-07 15:48:49 UTC]

Gentoo ship e1000e in 2.6.23 too. Are we affected there as well?

[Comment 3 Johan Ymerson 2008-02-07 17:06:14 UTC]

(In reply to comment #2)
> Gentoo ship e1000e in 2.6.23 too. Are we affected there as well?
> 

Yes, at least sys-kernel/gentoo-sources-2.6.23-r6.

[Comment 4 Daniel Drake (RETIRED) 2008-02-12 13:44:18 UTC]

sent a mail upstream

[Comment 5 Daniel Drake (RETIRED) 2008-02-12 14:01:48 UTC]

will track the upstream bug, thanks

[Comment 6 Daniel Drake (RETIRED) 2008-02-15 19:24:10 UTC]

upstream patch queued for next releases

[Comment 7 Daniel Drake (RETIRED) 2008-02-26 17:12:12 UTC]

Fixed in genpatches-2.6.23-10 (gentoo-sources-2.6.23-r9) and genpatches-2.6.24-4 (gentoo-sources-2.6.24-r3), thanks for your help with this bug