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Date:	Thu, 20 Nov 2014 17:07:44 -0800
From:	Tom Herbert <>
To:	Ben Hutchings <>
Cc:, Linux Netdev List <>
Subject: Re: Translation table available between 'ethtool -k' and 'ethtool -K'
 ? For Linux?

On Thu, Nov 20, 2014 at 3:32 PM, Ben Hutchings <> wrote:
> On Thu, 2014-11-20 at 15:10 -0600, wrote:
>> Ethtool developers,
>> Is there a translation table available between the offload names that
>> ethtool –k reports and the offload names that ethool –K accepts?
>> Our network engineering team has to standard to disable all NIC
>> offloads.  I don’t disagree;  several have often bitten us in the
>> past.  LRO on vmxnet3 vNICs, TSO on old NICs and (just now) LRO on
>> ixgbe/Intel NIC.
> So instead of properly validating drivers, you just assume they all have
> the same bug as something you saw in the past?
> You may think you're being conservative, but by using non-default
> settings you're actually taking more of a risk.
Ben I'm not sure I see this. If we turn off HW offloads and rely on
the software offloads where is the increased risk? This may result in
performance degradation for sure, but I really hope at this point that
the software offload mechanisms in the stack are as least as robust as
any HW mechanism.

>> And we have CPU for days, never CPU-limited on our servers.
> Lucky you.  It's a shame about the power going to waste.
>> If ethtool –K accepted the offload format that –k reports, then
>> disabling all offloads would be trivial:
> [...]
>> Is there a translation table somewhere that translates from the ‘-k’
>> output offload names to the ‘-K’ style offload names?
> [...]
> Yes, it's the off_flag_def array.
> For any newly defined features, ethtool will simply use the name
> supplied by the kernel for both -k output and -K argument parsing.
> Ben.
> --
> Ben Hutchings
> Man invented language to satisfy his deep need to complain. - Lily Tomlin
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