[PATCH net-next 0/2] selftests: openvswitch: add pop_vlan test

[Minxi Hou <houminxi@gmail.com>]

This series extends the ovs-dpctl.py flow parser to support vlan() and
encap() match strings, then adds a test for the OVS datapath POP_VLAN
action.

The ovs-dpctl.py flow parser currently cannot express VLAN-tagged flow
matches.  The kernel unconditionally forces an exact match on VLAN TCI
when parsing flow keys, and requires both OVS_KEY_ATTR_VLAN and
OVS_KEY_ATTR_ENCAP for VLAN frame validation.  Without vlan()/encap()
parsing, no VLAN flow match is possible from ovs-dpctl.py.

Patch 1 fixes two pre-existing nla_map type bugs: OVS_KEY_ATTR_VLAN
was mapped to "uint16" instead of the correct big-endian "be16", and
OVS_KEY_ATTR_ENCAP was mapped to "none" instead of "nested".  It then
adds the vlan() and encap() flow string parsers, dpstr() display
support, and proper ovskey instance returns for encap.

Patch 2 adds a test that uses kernel VLAN sub-interfaces to generate
802.1Q tagged frames and verifies pop_vlan via pcap at the egress
veth.  A negative check confirms tagged frames arrive intact without
pop_vlan, then the positive check confirms the tag is stripped.

No regression in the existing OVS selftests.

Signed-off-by: Minxi Hou <houminxi@gmail.com>

Minxi Hou (2):
  selftests: openvswitch: add vlan() and encap() flow string parsing
  selftests: openvswitch: add pop_vlan test

 .../selftests/net/openvswitch/openvswitch.sh  | 132 ++++++++++++
 .../selftests/net/openvswitch/ovs-dpctl.py    | 190 +++++++++++++++++-
 2 files changed, 320 insertions(+), 2 deletions(-)


base-commit: 4baf2415992e3051cb39b831191d12cb7e85ab60
-- 
2.53.0