selftests: mlxsw: Add PCI reset test

#!/bin/bash

# SPDX-License-Identifier: GPL-2.0

#

# Test that PCI reset works correctly by verifying that only the expected reset

# methods are supported and that after issuing the reset the ifindex of the

# port changes.

lib_dir=$(dirname $0)/../../../net/forwarding

ALL_TESTS="

	pci_reset_test

"

NUM_NETIFS=1

source $lib_dir/lib.sh

source $lib_dir/devlink_lib.sh

pci_reset_test()

{

	RET=0

	local bus=$(echo $DEVLINK_DEV | cut -d '/' -f 1)

	local bdf=$(echo $DEVLINK_DEV | cut -d '/' -f 2)

	if [ $bus != "pci" ]; then

		check_err 1 "devlink device is not a PCI device"

		log_test "pci reset"

		return

	fi

	if [ ! -f /sys/bus/pci/devices/$bdf/reset_method ]; then

		check_err 1 "reset is not supported"

		log_test "pci reset"

		return

	fi

	[[ $(cat /sys/bus/pci/devices/$bdf/reset_method) == "bus" ]]

	check_err $? "only \"bus\" reset method should be supported"

	local ifindex_pre=$(ip -j link show dev $swp1 | jq '.[]["ifindex"]')

	echo 1 > /sys/bus/pci/devices/$bdf/reset

	check_err $? "reset failed"

	# Wait for udev to rename newly created netdev.

	udevadm settle

	local ifindex_post=$(ip -j link show dev $swp1 | jq '.[]["ifindex"]')

	[[ $ifindex_pre != $ifindex_post ]]

	check_err $? "reset not performed"

	log_test "pci reset"

}

swp1=${NETIFS[p1]}

tests_run

exit $EXIT_STATUS