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From: "Hosom, Stephen M" <hosom@battelle.org>
To: "alpine-devel@lists.alpinelinux.org" <alpine-devel@lists.alpinelinux.org>
Subject: [alpine-devel] ixgbe odd behavior
Thread-Topic: ixgbe odd behavior
Thread-Index: AQHUZuGVoARm0CF9Nkm3jiCxz+rjPA==
Date: Thu, 18 Oct 2018 13:06:31 +0000
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I'm seeing an extraordinarily odd behavior with ixgbe on Alpine:

Using the command "ethtool -K <dev> tx off" to disable tcp checksum offload=
ing on an ixgbe device results in no longer seeing any tcp traffic on that =
interface until the next reboot.

I can't find anywhere that would indicate that this is defined behavior. On=
 other distributions, disabling checksum offloading only does just that.

It's entirely possible that doing a rmmod and modprobe to reload ixgbe migh=
t fix the issue, but this system uses ixgbe for its management port, so its=
 simpler to just reboot.

I thought that this might be an issue with Alpine's build of the ixgbe modu=
le, so I rebuilt the module with the source provided by intel and replicate=
d the issue on version too. The ixgbe device that I'm using is an Intel X71=
0-DA2 and the use-case is for packet capture / IDS.


uname -a

Linux somehost 4.14.69-0-vanilla #1-Alpine SMP Mon Sep 10 19:33:23 UTC 2018=
 x86_64 Linux


cat /etc/alpine-release

3.8.1

Anyone have any thoughts? This certainly seems like a bug to me, but if it =
is defined behavior and there's a work-around, I'd be perfectly happy with =
that too.


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