Recent changes in the headroom management code made it clear that an automated way of testing this functionality is needed. This patchset brings two tests: a synthetic headroom behavior test, which verifies mechanics of headroom management. And a PFC test, which verifies whether this behavior actually translates into a working lossless configuration.
Both of these tests rely on mlnx_qos[1], a tool that interfaces with Linux DCB API. The tool was originally written to work with Mellanox NICs, but does not actually rely on anything Mellanox-specific, and can be used for mlxsw as well as for any other NIC-like driver. Unlike Open LLDP it does support buffer commands and permits a fire-and-forget approach to configuration, which makes it very handy for writing of selftests. Patches #1-#3 extend the selftest devlink_lib.sh in various ways. Patch #4 then adds a helper wrapper for mlnx_qos to mlxsw's qos_lib.sh. Patch #5 adds a test for management of port headroom. Patch #6 adds a PFC test. [1] https://github.com/Mellanox/mlnx-tools/ Petr Machata (6): selftests: forwarding: devlink_lib: Split devlink_..._set() into save & set selftests: forwarding: devlink_lib: Add devlink_cell_size_get() selftests: forwarding: devlink_lib: Support port-less topologies selftests: mlxsw: qos_lib: Add a wrapper for running mlnx_qos selftests: mlxsw: Add headroom handling test selftests: mlxsw: Add a PFC test .../drivers/net/mlxsw/qos_ets_strict.sh | 9 + .../drivers/net/mlxsw/qos_headroom.sh | 379 ++++++++++++++++ .../selftests/drivers/net/mlxsw/qos_lib.sh | 14 + .../drivers/net/mlxsw/qos_mc_aware.sh | 5 + .../selftests/drivers/net/mlxsw/qos_pfc.sh | 403 ++++++++++++++++++ .../selftests/drivers/net/mlxsw/sch_ets.sh | 6 + .../drivers/net/mlxsw/sch_red_core.sh | 1 + .../selftests/net/forwarding/devlink_lib.sh | 72 +++- 8 files changed, 876 insertions(+), 13 deletions(-) create mode 100755 tools/testing/selftests/drivers/net/mlxsw/qos_headroom.sh create mode 100755 tools/testing/selftests/drivers/net/mlxsw/qos_pfc.sh -- 2.20.1
