selftests/net: allow GRO coalesce test on veth

This change extends the existing GRO coalesce test to
allow running on top of a veth pair, so that no H/W dep
is required to run them.

By default gro.sh will use the veth backend, and will try
to use exiting H/W in loopback mode if a specific device
name is provided with the '-i' command line option.

No functional change is intended for the loopback-based
tests, just move all the relevant initialization/cleanup
code into the related script.

Introduces a new initialization helper script for the
veth backend, and plugs the correct helper script according
to the provided command line.

Additionally, enable veth-based tests by default.

v1 -> v2:
  - drop unused code in setup_veth_ns() - Willem

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 37 insertions, 1 deletions

diff --git a/tools/testing/selftests/net/setup_loopback.sh b/tools/testing/selftests/net/setup_loopback.sh
index 0a8ad97b07ea..e57bbfbc5208 100755
--- a/tools/testing/selftests/net/setup_loopback.sh
+++ b/tools/testing/selftests/net/setup_loopback.sh
@@ -1,5 +1,11 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
+
+readonly FLUSH_PATH="/sys/class/net/${dev}/gro_flush_timeout"
+readonly IRQ_PATH="/sys/class/net/${dev}/napi_defer_hard_irqs"
+readonly FLUSH_TIMEOUT="$(< ${FLUSH_PATH})"
+readonly HARD_IRQS="$(< ${IRQ_PATH})"
+
 netdev_check_for_carrier() {
 	local -r dev="$1"
 
@@ -18,7 +24,7 @@ netdev_check_for_carrier() {
 
 # Assumes that there is no existing ipvlan device on the physical device
 setup_loopback_environment() {
-    local dev="$1"
+	local dev="$1"
 
 	# Fail hard if cannot turn on loopback mode for current NIC
 	ethtool -K "${dev}" loopback on || exit 1
@@ -80,3 +86,33 @@ cleanup_loopback(){
 		exit 1
 	fi
 }
+
+setup_interrupt() {
+	# Use timer on  host to trigger the network stack
+	# Also disable device interrupt to not depend on NIC interrupt
+	# Reduce test flakiness caused by unexpected interrupts
+	echo 100000 >"${FLUSH_PATH}"
+	echo 50 >"${IRQ_PATH}"
+}
+
+setup_ns() {
+	# Set up server_ns namespace and client_ns namespace
+	setup_macvlan_ns "${dev}" server_ns server "${SERVER_MAC}"
+	setup_macvlan_ns "${dev}" client_ns client "${CLIENT_MAC}"
+}
+
+cleanup_ns() {
+	cleanup_macvlan_ns server_ns server client_ns client
+}
+
+setup() {
+	setup_loopback_environment "${dev}"
+	setup_interrupt
+}
+
+cleanup() {
+	cleanup_loopback "${dev}"
+
+	echo "${FLUSH_TIMEOUT}" >"${FLUSH_PATH}"
+	echo "${HARD_IRQS}" >"${IRQ_PATH}"
+}