feat(interface): apply MTU for dpdk plugin ifaces

When changing MTU on a running VPP, the interface has to be down.

- Other plugins (rdma, avf, af_xdp) need vastly different logic,
  so support for them will be added later.
+ Mlx5-core does not need to set MTU on Linux interface.
+ MTU setting now does not happen at final setting path up,
  it happens in driver initialization layer instead
  E.g. AVF tests will not attempt to change MTU.
+ MTU edit removed from some non-hardware interfaces (including memif)
  e.g. bond interfaces. MTU on parent hw interface seems to be enough.
+ The non-jumbo MTU value used is 1800,
  so 1518B tests with additional encapsulation can still work.
+ When VPP MTU setting fails, the failure is now propagated.
  Previously, the failure was just logged and ignored,
  but now there is no reason to hide it.

Ticket: CSIT-1797

Change-Id: I3b853f1faf90001d544cbbb87b2affbb882ffba0
Signed-off-by: Vratko Polak <vrpolak@cisco.com>

1 files changed, 1 insertions, 5 deletions

diff --git a/resources/libraries/robot/l2/l2_xconnect.robot b/resources/libraries/robot/l2/l2_xconnect.robot
index 1d4d40db3d..b782602827 100644
--- a/resources/libraries/robot/l2/l2_xconnect.robot
+++ b/resources/libraries/robot/l2/l2_xconnect.robot
@@ -1,4 +1,4 @@
-# Copyright (c) 2022 Cisco and/or its affiliates.
+# Copyright (c) 2023 Cisco and/or its affiliates.
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at:
@@ -243,8 +243,6 @@
 | | Set interfaces in path up
 | | ${dut1_eth_bond_if1}= | VPP Create Bond Interface
 | | ... | ${dut1} | ${bond_mode} | ${lb_mode}
-| | Set Interface State | ${dut1} | ${dut1_eth_bond_if1} | up
-| | VPP Set interface MTU | ${dut1} | ${dut1_eth_bond_if1}
 | | FOR | ${pf} | IN RANGE | 1 | ${nic_pfs} + 1
 | | | ${_even}= | Evaluate | ${pf} % 2
 | | | Run Keyword If | not ${even}
@@ -253,8 +251,6 @@
 | | END
 | | ${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}
 | | FOR | ${pf} | IN RANGE | 1 | ${nic_pfs} + 1
 | | | ${_even}= | Evaluate | ${pf} % 2
 | | | Run Keyword If | ${even}