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test: add msg_zerocopy test
Introduce regression test for msg_zerocopy feature. Send traffic from one process to another with and without zerocopy. Evaluate tcp, udp, raw and packet sockets, including variants - udp: corking and corking with mixed copy/zerocopy calls - raw: with and without hdrincl - packet: at both raw and dgram level Test on both ipv4 and ipv6, optionally with ethtool changes to disable scatter-gather, tx checksum or tso offload. All of these can affect zerocopy behavior. The regression test can be run on a single machine if over a veth pair. Then skb_orphan_frags_rx must be modified to be identical to skb_orphan_frags to allow forwarding zerocopy locally. The msg_zerocopy.sh script will setup the veth pair in network namespaces and run all tests. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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‎tools/testing/selftests/net/.gitignore

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msg_zerocopy
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socket
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psock_fanout
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psock_tpacket

‎tools/testing/selftests/net/Makefile

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TEST_GEN_FILES = socket
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TEST_GEN_FILES += psock_fanout psock_tpacket
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TEST_GEN_FILES += reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
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TEST_GEN_FILES += reuseport_dualstack
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TEST_GEN_FILES += reuseport_dualstack msg_zerocopy
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include ../lib.mk
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