this selftest is designed for evaluating the SRv6 End.DX6 behavior
used with netfilter(rpfilter), in this example, for implementing
IPv6 L3 VPN use cases.

Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

this selftest is designed for evaluating the SRv6 End.DX4 behavior
used with netfilter(rpfilter), in this example, for implementing
IPv4 L3 VPN use cases.

Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Add a simple test for the epoll busy poll ioctls, using the kernel
selftest harness.

This test ensures that the ioctls have the expected return codes and
that the kernel properly gets and sets epoll busy poll parameters.

The test can be expanded in the future to do real busy polling (provided
another machine to act as the client is available).

Signed-off-by: Joe Damato <jdamato@fastly.com>
Link: https://lore.kernel.org/r/20240508184008.48264-1-jdamato@fastly.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Run tools/testing/selftest/net/csum.c as part of drv-net.
This binary covers multiple scenarios, based on arguments given,
for both IPv4 and IPv6:

- Accept UDP correct checksum
- Detect UDP invalid checksum
- Accept TCP correct checksum
- Detect TCP invalid checksum

- Transmit UDP: basic checksum offload
- Transmit UDP: zero checksum conversion

The test direction is reversed between receive and transmit tests, so
that the NIC under test is always the local machine.

In total this adds up to 12 testcases, with more to follow. For
conciseness, I replaced individual functions with a function factory.

Also detect hardware offload feature availability using Ethtool
netlink and skip tests when either feature is off. This need may be
common for offload feature tests and eventually deserving of a thin
wrapper in lib.py.

Missing are the PF_PACKET based send tests ('-P'). These use
virtio_net_hdr to program hardware checksum offload. Which requires
looking up the local MAC address and (harder) the MAC of the next hop.
I'll have to give it some though how to do that robustly and where
that code would belong.

Tested:

        make -C tools/testing/selftests/ \
                TARGETS="drivers/net drivers/net/hw" \
                install INSTALL_PATH=/tmp/ksft
        cd /tmp/ksft

	sudo NETIF=ens4 REMOTE_TYPE=ssh \
		REMOTE_ARGS="root@10.40.0.2" \
		LOCAL_V4="10.40.0.1" \
		REMOTE_V4="10.40.0.2" \
		./run_kselftest.sh -t drivers/net/hw:csum.py

Signed-off-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20240507154216.501111-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

The BPF sample building code looks a little bit spaghetti-ish
so move it out to its own Makefile snippet. Similar in the spirit
to how we include lib.mk. libynl will soon get a similar snippet.

There is a small change hiding in the move, the relative
paths (../../.., ../.. etc) are replaced with variables
from lib.mk such as top_srcdir and selfdir.

Link: https://lore.kernel.org/r/20240423183542.3807234-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

The BPF sources moved with bpf_offload.py have a suffix of .bpf.c
which seems to be useful convention. Rename the 2 other BPF sources
we had. Use wildcard in the Makefile, since we can match all those
files easily now.

Link: https://lore.kernel.org/r/20240423183542.3807234-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

selftest build is fairly noisy, it's easy to miss warnings.
It's standard practice to add alternative messages in
the Makefile. I was grepping for existing solutions,
and found that bpf already has the right knobs.

Move them to lib.mk and adopt in net.
Convert the basic rules in lib.mk.

Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20240411190534.444918-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Non-ancient ip (iproute2-5.15.0, libbpf 0.7.0) refuses to load
the sample with maps because we don't generate BTF:

   libbpf: BTF is required, but is missing or corrupted.
   ERROR: opening BPF object file failed

Enable BTF by adding -g to clang flags. With that done
neither of the programs load:

  libbpf: prog 'func': error relocating .BTF.ext function info: -22
  libbpf: prog 'func': failed to relocate calls: -22
  libbpf: failed to load object 'ksft-net-drv/net/sample_ret0.bpf.o'

Andrii explains that this is because we don't specify
section names for the code. Add the section names, too.

Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240409031549.3531084-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

We're building more python tests on the netdev side, and some
of the classes from the venerable BPF offload tests can be reused.

Acked-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240409031549.3531084-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Add a trivial test using YNL.

  $ ./tools/testing/selftests/net/nl_netdev.py
  KTAP version 1
  1..2
  ok 1 nl_netdev.empty_check
  ok 2 nl_netdev.lo_check

Instantiate the family once, it takes longer than the test itself.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>