VPP link bonding perf tests with two links between DUTs

Jira: CSIT-1247

Change-Id: Ia6a3f7682eb9a35040682913c0e33a1d61d1e6fa
Signed-off-by: Jan Gelety <jgelety@cisco.com>

2 files changed, 239 insertions, 29 deletions

diff --git a/resources/libraries/robot/performance/performance_configuration.robot b/resources/libraries/robot/performance/performance_configuration.robot
index 30500964d7..2e7274b0a9 100644
--- a/resources/libraries/robot/performance/performance_configuration.robot
+++ b/resources/libraries/robot/performance/performance_configuration.robot
@@ -45,17 +45,45 @@
 | | ...
 # TODO: Rework KW to set all interfaces in path UP and set MTU (including
 # software interfaces. Run KW at the start phase of VPP setup to split
-# from other "functial" configuration. This will allow modularity of this
+# from other "functional" configuration. This will allow modularity of this
 # library
 | | ${duts}= | Get Matches | ${nodes} | DUT*
 | | :FOR | ${dut} | IN | @{duts}
-| | | Set Interface State | ${nodes['${dut}']} | ${${dut}_if1} | up
-| | | Set Interface State | ${nodes['${dut}']} | ${${dut}_if2} | up
+| | | ${if1_status} | ${value}= | Run Keyword And Ignore Error
+| | | ... | Variable Should Exist | ${${dut}_if1}
+| | | Run Keyword If | '${if1_status}' == 'PASS'
+| | | ... | Set Interface State | ${nodes['${dut}']} | ${${dut}_if1} | up
+| | | ... | ELSE
+| | | ... | Set Interface State | ${nodes['${dut}']} | ${${dut}_if1_1} | up
+| | | Run Keyword Unless | '${if1_status}' == 'PASS'
+| | | ... | Set Interface State | ${nodes['${dut}']} | ${${dut}_if1_2} | up
+| | | ${if2_status} | ${value}= | Run Keyword And Ignore Error
+| | | ... | Variable Should Exist | ${${dut}_if2}
+| | | Run Keyword If | '${if2_status}' == 'PASS'
+| | | ... | Set Interface State | ${nodes['${dut}']} | ${${dut}_if2} | up
+| | | ... | ELSE
+| | | ... | Set Interface State | ${nodes['${dut}']} | ${${dut}_if2_1} | up
+| | | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | | ... | Set Interface State | ${nodes['${dut}']} | ${${dut}_if2_2} | up
 | | All VPP Interfaces Ready Wait | ${nodes}
 | | ${duts}= | Get Matches | ${nodes} | DUT*
 | | :FOR | ${dut} | IN | @{duts}
-| | | VPP Set Interface MTU | ${nodes['${dut}']} | ${${dut}_if1}
-| | | VPP Set Interface MTU | ${nodes['${dut}']} | ${${dut}_if2}
+| | | ${if1_status} | ${value}= | Run Keyword And Ignore Error
+| | | ... | Variable Should Exist | ${${dut}_if1}
+| | | Run Keyword If | '${if1_status}' == 'PASS'
+| | | ... | VPP Set Interface MTU | ${nodes['${dut}']} | ${${dut}_if1}
+| | | ... | ELSE
+| | | ... | VPP Set Interface MTU | ${nodes['${dut}']} | ${${dut}_if1_1}
+| | | Run Keyword Unless | '${if1_status}' == 'PASS'
+| | | ... | VPP Set Interface MTU | ${nodes['${dut}']} | ${${dut}_if1_2}
+| | | ${if2_status} | ${value}= | Run Keyword And Ignore Error
+| | | ... | Variable Should Exist | ${${dut}_if2}
+| | | Run Keyword If | '${if2_status}' == 'PASS'
+| | | ... | VPP Set Interface MTU | ${nodes['${dut}']} | ${${dut}_if2}
+| | | ... | ELSE
+| | | ... | VPP Set Interface MTU | ${nodes['${dut}']} | ${${dut}_if2_1}
+| | | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | | ... | VPP Set Interface MTU | ${nodes['${dut}']} | ${${dut}_if2_2}
 | | All VPP Interfaces Ready Wait | ${nodes}
 
 | Initialize IPSec in 3-node circular topology
@@ -984,13 +1012,31 @@
 | | ... | ${lb_mode}
 | | Set Interface State | ${dut1} | ${dut1_eth_bond_if1} | up
 | | VPP Set interface MTU | ${dut1} | ${dut1_eth_bond_if1}
-| | VPP Enslave Physical Interface | ${dut1} | ${dut1_if2}
+| | ${if2_status} | ${value}= | Run Keyword And Ignore Error
+| | ... | Variable Should Exist | ${dut1_if2}
+| | Run Keyword If | '${if2_status}' == 'PASS'
+| | ... | VPP Enslave Physical Interface | ${dut1} | ${dut1_if2}
+| | ... | ${dut1_eth_bond_if1}
+| | ... | ELSE
+| | ... | VPP Enslave Physical Interface | ${dut1} | ${dut1_if2_1}
+| | ... | ${dut1_eth_bond_if1}
+| | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | ... | VPP Enslave Physical Interface | ${dut1} | ${dut1_if2_2}
 | | ... | ${dut1_eth_bond_if1}
 | | ${dut2_eth_bond_if1}= | VPP Create Bond Interface | ${dut2} | ${bond_mode}
 | | ... | ${lb_mode}
 | | Set Interface State | ${dut2} | ${dut2_eth_bond_if1} | up
 | | VPP Set interface MTU | ${dut1} | ${dut1_eth_bond_if1}
-| | VPP Enslave Physical Interface | ${dut2} | ${dut2_if1}
+| | ${if1_status} | ${value}= | Run Keyword And Ignore Error
+| | ... | Variable Should Exist | ${dut2_if1}
+| | Run Keyword If | '${if1_status}' == 'PASS'
+| | ... | VPP Enslave Physical Interface | ${dut2} | ${dut2_if1}
+| | ... | ${dut2_eth_bond_if1}
+| | ... | ELSE
+| | ... | VPP Enslave Physical Interface | ${dut2} | ${dut2_if1_1}
+| | ... | ${dut2_eth_bond_if1}
+| | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | ... | VPP Enslave Physical Interface | ${dut2} | ${dut2_if1_2}
 | | ... | ${dut2_eth_bond_if1}
 | | VPP Show Bond Data On All Nodes | ${nodes} | details=${TRUE}
 | | Initialize VLAN dot1q sub-interfaces in 3-node circular topology
@@ -1704,13 +1750,31 @@
 | | ... | ${lb_mode}
 | | Set Interface State | ${dut1} | ${dut1_eth_bond_if1} | up
 | | VPP Set interface MTU | ${dut1} | ${dut1_eth_bond_if1}
-| | VPP Enslave Physical Interface | ${dut1} | ${dut1_if2}
+| | ${if2_status} | ${value}= | Run Keyword And Ignore Error
+| | ... | Variable Should Exist | ${dut1_if2}
+| | Run Keyword If | '${if2_status}' == 'PASS'
+| | ... | VPP Enslave Physical Interface | ${dut1} | ${dut1_if2}
+| | ... | ${dut1_eth_bond_if1}
+| | ... | ELSE
+| | ... | VPP Enslave Physical Interface | ${dut1} | ${dut1_if2_1}
+| | ... | ${dut1_eth_bond_if1}
+| | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | ... | VPP Enslave Physical Interface | ${dut1} | ${dut1_if2_2}
 | | ... | ${dut1_eth_bond_if1}
 | | ${dut2_eth_bond_if1}= | VPP Create Bond Interface | ${dut2} | ${bond_mode}
 | | ... | ${lb_mode}
 | | Set Interface State | ${dut2} | ${dut2_eth_bond_if1} | up
 | | VPP Set interface MTU | ${dut2} | ${dut2_eth_bond_if1}
-| | VPP Enslave Physical Interface | ${dut2} | ${dut2_if1}
+| | ${if1_status} | ${value}= | Run Keyword And Ignore Error
+| | ... | Variable Should Exist | ${dut2_if1}
+| | Run Keyword If | '${if1_status}' == 'PASS'
+| | ... | VPP Enslave Physical Interface | ${dut2} | ${dut2_if1}
+| | ... | ${dut2_eth_bond_if1}
+| | ... | ELSE
+| | ... | VPP Enslave Physical Interface | ${dut2} | ${dut2_if1_1}
+| | ... | ${dut2_eth_bond_if1}
+| | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | ... | VPP Enslave Physical Interface | ${dut2} | ${dut2_if1_2}
 | | ... | ${dut2_eth_bond_if1}
 | | VPP Show Bond Data On All Nodes | ${nodes} | details=${TRUE}
 | | Initialize VLAN dot1q sub-interfaces in 3-node circular topology
@@ -1738,11 +1802,43 @@
 | | ...
 | | ${duts}= | Get Matches | ${nodes} | DUT*
 | | :FOR | ${dut} | IN | @{duts}
-| | | ${if1_pci}= | Get Interface PCI Addr | ${nodes['${dut}']} | ${${dut}_if1}
-| | | ${if2_pci}= | Get Interface PCI Addr | ${nodes['${dut}']} | ${${dut}_if2}
-| | | Run keyword | ${dut}.Add DPDK Dev | ${if1_pci} | ${if2_pci}
-| | | Set Test Variable | ${${dut}_if1_pci} | ${if1_pci}
-| | | Set Test Variable | ${${dut}_if2_pci} | ${if2_pci}
+| | | ${if1_status} | ${value}= | Run Keyword And Ignore Error
+| | | ... | Variable Should Exist | ${${dut}_if1}
+| | | ${if1_pci}= | Run Keyword If | '${if1_status}' == 'PASS'
+| | | ... | Get Interface PCI Addr | ${nodes['${dut}']} | ${${dut}_if1}
+| | | ${if1_1_pci}= | Run Keyword Unless | '${if1_status}' == 'PASS'
+| | | ... | Get Interface PCI Addr | ${nodes['${dut}']} | ${${dut}_if1_1}
+| | | ${if1_2_pci}= | Run Keyword Unless | '${if1_status}' == 'PASS'
+| | | ... | Get Interface PCI Addr | ${nodes['${dut}']} | ${${dut}_if1_2}
+| | | ${if2_status} | ${value}= | Run Keyword And Ignore Error
+| | | ... | Variable Should Exist | ${${dut}_if2}
+| | | ${if2_pci}= | Run Keyword If | '${if2_status}' == 'PASS'
+| | | ... | Get Interface PCI Addr | ${nodes['${dut}']} | ${${dut}_if2}
+| | | ${if2_1_pci}= | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | | ... | Get Interface PCI Addr | ${nodes['${dut}']} | ${${dut}_if2_1}
+| | | ${if2_2_pci}= | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | | ... | Get Interface PCI Addr | ${nodes['${dut}']} | ${${dut}_if2_2}
+| | | @{pci_devs}= | Run Keyword If | '${if1_status}' == 'PASS'
+| | | ... | Create List | ${if1_pci}
+| | | ... | ELSE
+| | | ... | Create List | ${if1_1_pci} | ${if1_2_pci}
+| | | Run Keyword If | '${if2_status}' == 'PASS'
+| | | ... | Append To List | ${pci_devs} | ${if2_pci}
+| | | ... | ELSE
+| | | ... | Append To List | ${pci_devs} | ${if2_1_pci} | ${if2_2_pci}
+| | | Run keyword | ${dut}.Add DPDK Dev | @{pci_devs}
+| | | Run Keyword If | '${if1_status}' == 'PASS'
+| | | ... | Set Test Variable | ${${dut}_if1_pci} | ${if1_pci}
+| | | Run Keyword Unless | '${if1_status}' == 'PASS'
+| | | ... | Set Test Variable | ${${dut}_if1_1_pci} | ${if1_1_pci}
+| | | Run Keyword Unless | '${if1_status}' == 'PASS'
+| | | ... | Set Test Variable | ${${dut}_if1_2_pci} | ${if1_2_pci}
+| | | Run Keyword If | '${if2_status}' == 'PASS'
+| | | ... | Set Test Variable | ${${dut}_if2_pci} | ${if2_pci}
+| | | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | | ... | Set Test Variable | ${${dut}_if2_1_pci} | ${if2_1_pci}
+| | | Run Keyword Unless | '${if2_status}' == 'PASS'
+| | | ... | Set Test Variable | ${${dut}_if2_2_pci} | ${if2_2_pci}
 
 | Add single PCI device to all DUTs
 | | [Documentation]
@@ -1757,7 +1853,7 @@
 | | | Run keyword | ${dut}.Add DPDK Dev | ${if1_pci}
 | | | Set Test Variable | ${${dut}_if1_pci} | ${if1_pci}
 
-| Add VLAN Strip Offload switch off between DUTs in 3-node single link topology
+| Add VLAN strip offload switch off between DUTs in 3-node single link topology
 | | [Documentation]
 | | ... | Add VLAN Strip Offload switch off on PCI devices between DUTs to VPP
 | | ... | configuration file.
@@ -1767,6 +1863,20 @@
 | | Run keyword | DUT2.Add DPDK Dev Parameter | ${dut2_if1_pci}
 | | ... | vlan-strip-offload | off
 
+| Add VLAN strip offload switch off between DUTs in 3-node double link topology
+| | [Documentation]
+| | ... | Add VLAN Strip Offload switch off on PCI devices between DUTs to VPP
+| | ... | configuration file.
+| | ...
+| | Run keyword | DUT1.Add DPDK Dev Parameter | ${dut1_if2_1_pci}
+| | ... | vlan-strip-offload | off
+| | Run keyword | DUT1.Add DPDK Dev Parameter | ${dut1_if2_2_pci}
+| | ... | vlan-strip-offload | off
+| | Run keyword | DUT2.Add DPDK Dev Parameter | ${dut2_if1_1_pci}
+| | ... | vlan-strip-offload | off
+| | Run keyword | DUT2.Add DPDK Dev Parameter | ${dut2_if1_2_pci}
+| | ... | vlan-strip-offload | off
+
 | Add DPDK bonded ethernet interfaces to DUTs in 3-node single link topology
 | | [Documentation]
 | | ... | Add DPDK bonded Ethernet interfaces with mode XOR and transmit policy
@@ -1819,8 +1929,17 @@
 | | Run keyword | ${vm_name}.Qemu Set Serial Port | ${serial_port}
 | | ${ssh_fwd_port}= | Evaluate | ${qemu_id} + ${10021}
 | | Run keyword | ${vm_name}.Qemu Set Ssh Fwd Port | ${ssh_fwd_port}
-| | ${dut_numa}= | Get interfaces numa node | ${nodes['${dut}']}
-| | ... | ${${dut}_if1} | ${${dut}_if2}
+| | ${if1_status} | ${value}= | Run Keyword And Ignore Error
+| | ... | Variable Should Exist | ${${dut}_if1}
+| | @{if_list}= | Run Keyword If | '${if1_status}' == 'PASS'
+| | ... | Create List | ${${dut}_if1}
+| | ... | ELSE | Create List | ${${dut}_if1_1} | ${${dut}_if1_2}
+| | ${if2_status} | ${value}= | Run Keyword And Ignore Error
+| | ... | Variable Should Exist | ${${dut}_if2}
+| | Run Keyword If | '${if2_status}' == 'PASS'
+| | ... | Append To List | ${if_list} | ${${dut}_if2}
+| | ... | ELSE | Append To List | ${if_list} | ${${dut}_if2_1} | ${${dut}_if2_2}
+| | ${dut_numa}= | Get interfaces numa node | ${nodes['${dut}']} | @{if_list}
 # Compute CPU placement for VM based on expected DUT placement.
 | | ${os_cpus}= | Set Variable | ${1}
 | | ${dut_main_cpus}= | Set Variable | ${1}
diff --git a/resources/libraries/robot/performance/performance_setup.robot b/resources/libraries/robot/performance/performance_setup.robot
index eef624e50c..0a1eeec955 100644
--- a/resources/libraries/robot/performance/performance_setup.robot
+++ b/resources/libraries/robot/performance/performance_setup.robot
@@ -142,8 +142,8 @@
 | | ... | - dut1_if1 - DUT1 interface towards TG.
 | | ... | - dut1_if2 - DUT1 interface towards DUT2.
 | | ... | - dut2 - DUT2 node
-| | ... | - dut2_if1 - DUT2 interface towards TG.
-| | ... | - dut2_if2 - DUT2 interface towards DUT1.
+| | ... | - dut2_if1 - DUT2 interface towards DUT1.
+| | ... | - dut2_if2 - DUT2 interface towards TG.
 | | ...
 | | ... | *Example:*
 | | ...
@@ -174,6 +174,74 @@
 | | Set Suite Variable | ${dut2_if1}
 | | Set Suite Variable | ${dut2_if2}
 
+| Set variables in 3-node circular topology with DUT interface model with double link between DUTs
+| | [Documentation]
+| | ... | Compute path for testing on three given nodes in circular topology
+| | ... | with double link between DUTs based on interface model provided as an
+| | ... | argument and set corresponding suite variables.
+| | ...
+| | ... | *Arguments:*
+| | ... | - iface_model - Interface model. Type: string
+| | ...
+| | ... | _NOTE:_ This KW sets following suite variables:
+| | ... | - tg - TG node
+| | ... | - tg_if1 - TG interface towards DUT1.
+| | ... | - tg_if2 - TG interface towards DUT2.
+| | ... | - dut1 - DUT1 node
+| | ... | - dut1_if1 - DUT1 interface towards TG.
+| | ... | - dut1_if2_1 - DUT1 interface 1 towards DUT2.
+| | ... | - dut1_if2_2 - DUT1 interface 2 towards DUT2.
+| | ... | - dut2 - DUT2 node
+| | ... | - dut2_if1_1 - DUT2 interface 1 towards DUT1.
+| | ... | - dut2_if1_2 - DUT2 interface 2 towards DUT1.
+| | ... | - dut2_if2 - DUT2 interface towards TG.
+| | ...
+| | ... | *Example:*
+| | ...
+| | ... | \| Set variables in 3-node circular topology with DUT interface model\
+| | ... | with double link between DUTs \| Intel-X520-DA2 \|
+| | ...
+| | [Arguments] | ${iface_model}
+| | ...
+| | ${iface_model_list}= | Create list | ${iface_model}
+| | # Compute path TG - DUT1 with single link in between
+| | Append Node | ${nodes['TG']}
+| | Append Node | ${nodes['DUT1']} | filter_list=${iface_model_list}
+| | Append Node | ${nodes['TG']}
+| | Compute Path
+| | ${tg_if1} | ${tg}= | Next Interface
+| | ${dut1_if1} | ${dut1}= | Next Interface
+| | # Compute path TG - DUT2 with single link in between
+| | Clear Path
+| | Append Node | ${nodes['TG']}
+| | Append Node | ${nodes['DUT2']} | filter_list=${iface_model_list}
+| | Append Node | ${nodes['TG']}
+| | Compute Path
+| | ${tg_if2} | ${tg}= | Next Interface
+| | ${dut2_if2} | ${dut2}= | Next Interface
+| | # Compute path DUT1 - DUT2 with double link in between
+| | Clear Path
+| | Append Node | ${nodes['DUT1']} | filter_list=${iface_model_list}
+| | Append Node | ${nodes['DUT2']} | filter_list=${iface_model_list}
+| | Append Node | ${nodes['DUT1']} | filter_list=${iface_model_list}
+| | Compute Path | always_same_link=${FALSE}
+| | ${dut1_if2_1} | ${dut1}= | First Interface
+| | ${dut1_if2_2} | ${dut1}= | Last Interface
+| | ${dut2_if1_1} | ${dut2}= | First Ingress Interface
+| | ${dut2_if1_2} | ${dut2}= | Last Egress Interface
+| | # Set suite variables
+| | Set Suite Variable | ${tg}
+| | Set Suite Variable | ${tg_if1}
+| | Set Suite Variable | ${tg_if2}
+| | Set Suite Variable | ${dut1}
+| | Set Suite Variable | ${dut1_if1}
+| | Set Suite Variable | ${dut1_if2_1}
+| | Set Suite Variable | ${dut1_if2_2}
+| | Set Suite Variable | ${dut2}
+| | Set Suite Variable | ${dut2_if1_1}
+| | Set Suite Variable | ${dut2_if1_2}
+| | Set Suite Variable | ${dut2_if2}
+
 | Tear down guest VM with dpdk-testpmd
 | | [Documentation]
 | | ... | Stop all qemu processes with dpdk-testpmd running on ${dut_node}.
@@ -228,8 +296,8 @@
 
 | Set up 2-node performance topology with DUT's NIC model
 | | [Documentation]
-| | ... | Suite preparation phase that setup default startup configuration of
-| | ... | VPP on all DUTs. Updates interfaces on all nodes and setup global
+| | ... | Suite preparation phase that sets the default startup configuration of
+| | ... | VPP on all DUTs. Updates interfaces on all nodes and sets the global
 | | ... | variables used in test cases based on interface model provided as an
 | | ... | argument. Initializes traffic generator.
 | | ...
@@ -250,8 +318,8 @@
 
 | Set up 2-node-switched performance topology with DUT's NIC model
 | | [Documentation]
-| | ... | Suite preparation phase that setup default startup configuration of
-| | ... | VPP on all DUTs. Updates interfaces on all nodes and setup global
+| | ... | Suite preparation phase that sets the default startup configuration of
+| | ... | VPP on all DUTs. Updates interfaces on all nodes and sets the global
 | | ... | variables used in test cases based on interface model provided as an
 | | ... | argument. Initializes traffic generator.
 | | ...
@@ -277,8 +345,8 @@
 
 | Set up 3-node performance topology with DUT's NIC model
 | | [Documentation]
-| | ... | Suite preparation phase that setup default startup configuration of
-| | ... | VPP on all DUTs. Updates interfaces on all nodes and setup global
+| | ... | Suite preparation phase that sets the default startup configuration of
+| | ... | VPP on all DUTs. Updates interfaces on all nodes and sets the global
 | | ... | variables used in test cases based on interface model provided as an
 | | ... | argument. Initializes traffic generator.
 | | ...
@@ -298,9 +366,32 @@
 | | Initialize traffic generator | ${tg} | ${tg_if1} | ${tg_if2}
 | | ... | ${dut1} | ${dut1_if1} | ${dut2} | ${dut2_if2} | ${topology_type}
 
+| Set up 3-node performance topology with DUT's NIC model with double link between DUTs
+| | [Documentation]
+| | ... | Suite preparation phase that sets the default startup configuration of
+| | ... | VPP on all DUTs. Updates interfaces on all nodes and sets the global
+| | ... | variables used in test cases based on interface model provided as an
+| | ... | argument. Initializes traffic generator.
+| | ...
+| | ... | *Arguments:*
+| | ... | - topology_type - Topology type. Type: string
+| | ... | - nic_model - Interface model. Type: string
+| | ...
+| | ... | *Example:*
+| | ...
+| | ... | \| Set up 3-node performance topology with DUT's NIC model with \
+| | ... | double link between DUTs \| L2 \| Intel-X520-DA2 \|
+| | ...
+| | [Arguments] | ${topology_type} | ${nic_model}
+| | ...
+| | Set variables in 3-node circular topology with DUT interface model with double link between DUTs
+| | ... | ${nic_model}
+| | Initialize traffic generator | ${tg} | ${tg_if1} | ${tg_if2}
+| | ... | ${dut1} | ${dut1_if1} | ${dut2} | ${dut2_if2} | ${topology_type}
+
 | Set up DPDK 2-node performance topology with DUT's NIC model
 | | [Documentation]
-| | ... | Updates interfaces on all nodes and setup global
+| | ... | Updates interfaces on all nodes and sets the global
 | | ... | variables used in test cases based on interface model provided as an
 | | ... | argument. Initializes traffic generator. Initializes DPDK test
 | | ... | environment.
@@ -324,7 +415,7 @@
 
 | Set up DPDK 3-node performance topology with DUT's NIC model
 | | [Documentation]
-| | ... | Updates interfaces on all nodes and setup global
+| | ... | Updates interfaces on all nodes and sets the global
 | | ... | variables used in test cases based on interface model provided as an
 | | ... | argument. Initializes traffic generator. Initializes DPDK test
 | | ... | environment.
@@ -438,8 +529,8 @@
 
 | Set up 3-node performance topology with wrk and DUT's NIC model
 | | [Documentation]
-| | ... | Suite preparation phase that setup default startup configuration of
-| | ... | VPP on all DUTs. Updates interfaces on all nodes and setup global
+| | ... | Suite preparation phase that sets the default startup configuration of
+| | ... | VPP on all DUTs. Updates interfaces on all nodes and sets the global
 | | ... | variables used in test cases based on interface model provided as an
 | | ... | argument. Installs the traffic generator.
 | | ...