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Date:	Mon, 25 Aug 2014 17:28:04 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH v2 0/8] Fix TSO and checksum issues with
 non-accelerated vlan traffic.

From: Vladislav Yasevich <>
Date: Mon, 25 Aug 2014 10:34:47 -0400

> I've recently ran across something rather interesting when testing vlans
> from inside VMs.  In some scenarios I was getting awfull thruput.
> Some debugging uncovered a very scary packet corruption.  I was
> seeing packets that had original TSO length as IP total length
> and their ip checksum was 0.  This was with e1000e driver.
> A bit more debugging uncovered an assumption made by that driver
> that skb->protocol will contain l3 protocol information.  This
> was not the case in my setup since I manually turned off vlan
> tx acceleration for the device.  This caused the driver to not
> initialize the tso information correctly and resulted in
> corrupt TSO frames on the wire.
> I decided to do some auditing of the usage of skb->protocols
> in the drivers.  Out of all the drivers, the included 8 appear
> to be effected.  They all allow user to control vlan acceleration
> settings, all support TSO on vlan devices, and all use
> skb->protocol to decide how to encode TSO information.  Some
> also have similar problems when initializing hw checksum information.
> On such device, it is simple enough to reproduce the issue.
> Simply turn off TX VLAN acceleration on the device, create a vlan,
> and run you favorite network performance tool.
> There is 1 driver I ran across that I belive will trigger a BUG
> in the system when used with vlans.  That driver is tile/tilepro.c
> I have not changed it in this patch set and would hope that
> the maintainer has time to look at it.
> V2: Fix i40ev using the wrong function name.  Full build.

Applied, thanks.
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