Extend the ntuple flow steering test to cover dst-ip, src-port, and
dst-port fields. The test supports arbitrary combinations of the fields,
for now we test src_ip/dst_ip, and src_ip/dst_ip/src_port/dst_port.

The tests currently match full fields, but we can consider adding
support for masked fields in the future.

 TAP version 13
 1..24
 ok 1 ntuple.queue.tcp4.src_ip
 ok 2 ntuple.queue.tcp4.dst_ip
 ok 3 ntuple.queue.tcp4.src_port
 ok 4 ntuple.queue.tcp4.dst_port
 ok 5 ntuple.queue.tcp4.src_ip.dst_ip
 ok 6 ntuple.queue.tcp4.src_ip.dst_ip.src_port.dst_port
 ok 7 ntuple.queue.udp4.src_ip
 ok 8 ntuple.queue.udp4.dst_ip
 ok 9 ntuple.queue.udp4.src_port
 ok 10 ntuple.queue.udp4.dst_port
 ok 11 ntuple.queue.udp4.src_ip.dst_ip
 ok 12 ntuple.queue.udp4.src_ip.dst_ip.src_port.dst_port
 ok 13 ntuple.queue.tcp6.src_ip
 ok 14 ntuple.queue.tcp6.dst_ip
 ok 15 ntuple.queue.tcp6.src_port
 ok 16 ntuple.queue.tcp6.dst_port
 ok 17 ntuple.queue.tcp6.src_ip.dst_ip
 ok 18 ntuple.queue.tcp6.src_ip.dst_ip.src_port.dst_port
 ok 19 ntuple.queue.udp6.src_ip
 ok 20 ntuple.queue.udp6.dst_ip
 ok 21 ntuple.queue.udp6.src_port
 ok 22 ntuple.queue.udp6.dst_port
 ok 23 ntuple.queue.udp6.src_ip.dst_ip
 ok 24 ntuple.queue.udp6.src_ip.dst_ip.src_port.dst_port
 # Totals: pass:24 fail:0 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Dimitri Daskalakis <daskald@meta.com>
Link: https://patch.msgid.link/20260407164954.2977820-3-dimitri.daskalakis1@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Add a test for ethtool NFC (ntuple) flow steering rules. The test
creates an ntuple rule matching on various flow fields and verifies
that traffic is steered to the correct queue.

The test forces all traffic to queue 0 via the indirection table,
then installs an ntuple rule to steer select traffic to a specific
queue. The test then verifies the expected number of packets is received
on the queue.

This test has variants for TCP/UDP over IPv4/IPv6, with rules matching
the source IP. Additional match fields will be added in the next commit.

 TAP version 13
 1..4
 ok 1 ntuple.queue.tcp4.src_ip
 ok 2 ntuple.queue.udp4.src_ip
 ok 3 ntuple.queue.tcp6.src_ip
 ok 4 ntuple.queue.udp6.src_ip
 # Totals: pass:4 fail:0 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Dimitri Daskalakis <daskald@meta.com>
Link: https://patch.msgid.link/20260407164954.2977820-2-dimitri.daskalakis1@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>