* Transmitting packets with AF_XDP on lo iface
@ 2020-01-15 21:03 Gilberto Bertin
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From: Gilberto Bertin @ 2020-01-15 21:03 UTC (permalink / raw)
To: xdp-newbies
Hi all,
I'm playing with AF_XDP with a program based on the sample one in the
xdp-tutorial repo.
The program is a simple UDP echo server, and works fine on any interface
_but_ the loopback one!
When I run it on lo, I can:
* receive packets
* send the responses
* see the UDP packets I'm sending from AF_xDP in tcpdump
but the actual application does not receive any traffic.
I also tried the original example in xdp-tutorial (which replies to ICMP
echo requests rather than UDP packets) and I can observe the same
behaviour.
I'm using:
* xdp-tutorial from master
* Ubuntu 19.10
* kernel 5.3.0
Is this a known issue? Does lo require any special configuration to work
with AF_XDP?
Cheers,
Gilberto
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2020-01-15 21:03 Transmitting packets with AF_XDP on lo iface Gilberto Bertin
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