netdev - selftest io_uring_zerocopy

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Date: Mon, 17 Jul 2023 12:11:53 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: netdev@...r.kernel.org
Subject: selftest io_uring_zerocopy_tx.sh failed on VM

Hi Pavel,

I tried to run test selftest io_uring_zerocopy_tx.sh on VM, but it failed
with error like

+ ip netns exec ns-45iLeE2 ./msg_zerocopy -4 -t 2 -C 2 -S 192.168.1.1 -D 192.168.1.2 -r udp
cpu: unable to pin, may increase variance.
+ ip netns exec ns-45iLeE1 ./io_uring_zerocopy_tx -4 -t 1 -D 192.168.1.2 -m 1 -t 1 -n 32 udp
./io_uring_zerocopy_tx: io_uring: queue init: Unknown error -13

Do you know what's the reason? Should we update the test script to return
SKIP if io_uring init failed?

Thanks
Hangbin