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Date: Wed, 5 Feb 2020 14:19:26 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Navdeep Parhar <np@FreeBSD.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: Re: svn commit: r357553 - head/sys/dev/cxgbe
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On Wed, Feb 05, 2020 at 12:13:15AM +0000, Navdeep Parhar wrote:

> Author: np
> Date: Wed Feb  5 00:13:15 2020
> New Revision: 357553
> URL: https://svnweb.freebsd.org/changeset/base/357553
> 
> Log:
>   cxgbe(4): Add a knob to allow netmap tx traffic to be checksummed by
>   the hardware.
>   
>   hw.cxgbe.nm_txcsum=1

Very interesting.
Please, describe some more detail about using this feture (for
example, set this before driver loading? first netmap open? any netmap
open? on the fly?)