selftests/xsk: add test when some packets are XDP_DROPed

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Add a new test where some of the packets are not passed to the AF_XDP
socket and instead get a XDP_DROP verdict. This is important as it
tests the recycling mechanism of the buffer pool. If a packet is not
sent to the AF_XDP socket, the buffer the packet resides in is instead
recycled so it can be used again without the round-trip to user
space. The test introduces a new XDP program that drops every other
packet.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20230111093526.11682-13-magnus.karlsson@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Magnus Karlsson 2023-01-11 10:35:23 +01:00 • committed by Alexei Starovoitov

parent f0a249df1b

commit 80bea9acab

3 changed files with 43 additions and 0 deletions

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11

tools/testing/selftests/bpf/progs/xsk_xdp_progs.c

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31

tools/testing/selftests/bpf/xskxceiver.c

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1

tools/testing/selftests/bpf/xskxceiver.h

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