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Date:      Sat, 12 Aug 2023 12:11:29 +0000
From:      bugzilla-noreply@freebsd.org
To:        xen@FreeBSD.org
Subject:   [Bug 273046] xn: xen netfront does LRO even if packet forwarding is enabled
Message-ID:  <bug-273046-23905-6ucyXKCuKs@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-273046-23905@https.bugs.freebsd.org/bugzilla/>
References:  <bug-273046-23905@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D273046

--- Comment #3 from dfr@rabson.org ---
Manually disabling LRO using something like 'ifconfig xn0 -lro' does solve =
the
issue.

I can see logic in sys/netinet/tcp_lro.c which checks for forwarding in
tcp_lro_rx_common but I think that code is only active for software LRO. If=
lib
also checks before calling tcp_lro_rx but that seems also to be only effect=
ive
for software LRO.

So far I haven't been able to figure out how any other driver manages this.=
 I'm
not even 100% sure which drivers support hardware LRO where coalescing happ=
ens
inside the NIC.

--=20
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