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, 41 insertions, 0 deletions

diff --git a/tools/testing/selftests/net/setup_veth.sh b/tools/testing/selftests/net/setup_veth.sh
new file mode 100644
index 000000000000..1003ddf7b3b2
--- /dev/null
+++ b/tools/testing/selftests/net/setup_veth.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+setup_veth_ns() {
+	local -r link_dev="$1"
+	local -r ns_name="$2"
+	local -r ns_dev="$3"
+	local -r ns_mac="$4"
+
+	[[ -e /var/run/netns/"${ns_name}" ]] || ip netns add "${ns_name}"
+	echo 100000 > "/sys/class/net/${ns_dev}/gro_flush_timeout"
+	ip link set dev "${ns_dev}" netns "${ns_name}" mtu 65535
+	ip -netns "${ns_name}" link set dev "${ns_dev}" up
+
+	ip netns exec "${ns_name}" ethtool -K "${ns_dev}" gro on tso off
+}
+
+setup_ns() {
+	# Set up server_ns namespace and client_ns namespace
+	ip link add name server type veth peer name client
+
+	setup_veth_ns "${dev}" server_ns server "${SERVER_MAC}"
+	setup_veth_ns "${dev}" client_ns client "${CLIENT_MAC}"
+}
+
+cleanup_ns() {
+	local ns_name
+
+	for ns_name in client_ns server_ns; do
+		[[ -e /var/run/netns/"${ns_name}" ]] && ip netns del "${ns_name}"
+	done
+}
+
+setup() {
+	# no global init setup step needed
+	:
+}
+
+cleanup() {
+	cleanup_ns
+}