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Date:      Sun, 12 Jan 2020 20:40:13 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 242890] vmxnet3 problem when RSS option is configured
Message-ID:  <bug-242890-7501-FWCVPErSzs@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-242890-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-242890-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D242890

--- Comment #3 from Patrick Kelsey <pkelsey@freebsd.org> ---
(In reply to Andriy Gapon from comment #2)

When I converted the vmxnet3 driver to iflib, I enabled the RSS code based =
on
iflib internals and looking sideways at the bnxt driver, and not so much by
thinking through the RSS code's fundamental requirements.

What I saw in the bnxt driver was that it was setting the RSS key using
arc4rand() in bnxt_attach_pre(), and that it is always using the hash value=
 for
the flowid in bnxt_pkt_get_l2().  That lead me to believe that the rss key
value did not have to be anything specific, and is why the way the vmxnet3 =
code
behaves with respect to this issue is functionally the same as what bnxt do=
es.

If I am not missing something further, perhaps this same issue exists for t=
he
bnxt driver as well.

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