[Bug 273046] xn: xen netfront does LRO even if packet forwarding is enabled

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 12 Aug 2023 12:11:29 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273046

--- 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. Iflib
also checks before calling tcp_lro_rx but that seems also to be only effective
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 happens
inside the NIC.

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