Merge branch 'mlxsw-PFC-and-headroom-selftests'

Petr Machata says:

====================
mlxsw: PFC and headroom selftests

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/
====================

Signed-off-by: David S. Miller <[email protected]>

Author: davem330

tools/testing/selftests/drivers/net/mlxsw/qos_ets_strict.sh

@@ -147,17 +147,26 @@ switch_create()
 
 	# Make sure that ingress quotas are smaller than egress so that there is
 	# room for both streams of traffic to be admitted to shared buffer.
+	devlink_pool_size_thtype_save 0
 	devlink_pool_size_thtype_set 0 dynamic 10000000
+	devlink_pool_size_thtype_save 4
 	devlink_pool_size_thtype_set 4 dynamic 10000000
 
+	devlink_port_pool_th_save $swp1 0
 	devlink_port_pool_th_set $swp1 0 6
+	devlink_tc_bind_pool_th_save $swp1 1 ingress
 	devlink_tc_bind_pool_th_set $swp1 1 ingress 0 6
 
+	devlink_port_pool_th_save $swp2 0
 	devlink_port_pool_th_set $swp2 0 6
+	devlink_tc_bind_pool_th_save $swp2 2 ingress
 	devlink_tc_bind_pool_th_set $swp2 2 ingress 0 6
 
+	devlink_tc_bind_pool_th_save $swp3 1 egress
 	devlink_tc_bind_pool_th_set $swp3 1 egress 4 7
+	devlink_tc_bind_pool_th_save $swp3 2 egress
 	devlink_tc_bind_pool_th_set $swp3 2 egress 4 7
+	devlink_port_pool_th_save $swp3 4
 	devlink_port_pool_th_set $swp3 4 7
 }