#!/bin/bash# SPDX-License-Identifier: GPL-2.0-only NSIM_ID=$((RANDOM % 1024))NSIM_DEV_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_IDNSIM_DEV_DFS=/sys/kernel/debug/netdevsim/netdevsim$NSIM_ID/ports/0NSIM_NETDEV=num_passes=0num_errors=0 function cleanup_nsim {    if [ -e $NSIM_DEV_SYS ]; then	echo $NSIM_ID > /sys/bus/netdevsim/del_device    fi} function cleanup {    cleanup_nsim} trap cleanup EXIT function get_netdev_name {    local -n old=$1     new=$(ls /sys/class/net)     for netdev in $new; do	for check in $old; do            [ $netdev == $check ] && break	done 	if [ $netdev != $check ]; then	    echo $netdev	    break	fi    done} function check {    local code=$1    local str=$2    local exp_str=$3     if [ $code -ne 0 ]; then	((num_errors++))	return    fi     if [ "$str" != "$exp_str"  ]; then	echo -e "Expected: '$exp_str', got '$str'"	((num_errors++))	return    fi     ((num_passes++))} # Bail if ethtool is too oldif ! ethtool -h | grep include-stat 2>&1 >/dev/null; then    echo "SKIP: No --include-statistics support in ethtool"    exit 4fi # Make a netdevsimold_netdevs=$(ls /sys/class/net) modprobe netdevsimecho $NSIM_ID > /sys/bus/netdevsim/new_device NSIM_NETDEV=`get_netdev_name old_netdevs` set -o pipefail echo n > $NSIM_DEV_DFS/ethtool/pause/report_stats_txecho n > $NSIM_DEV_DFS/ethtool/pause/report_stats_rx s=$(ethtool --json -a $NSIM_NETDEV | jq '.[].statistics')check $? "$s" "null" s=$(ethtool -I --json -a $NSIM_NETDEV | jq '.[].statistics')check $? "$s" "{}" echo y > $NSIM_DEV_DFS/ethtool/pause/report_stats_tx s=$(ethtool -I --json -a $NSIM_NETDEV | jq '.[].statistics | length')check $? "$s" "1" s=$(ethtool -I --json -a $NSIM_NETDEV | jq '.[].statistics.tx_pause_frames')check $? "$s" "2" echo y > $NSIM_DEV_DFS/ethtool/pause/report_stats_rx s=$(ethtool -I --json -a $NSIM_NETDEV | jq '.[].statistics | length')check $? "$s" "2" s=$(ethtool -I --json -a $NSIM_NETDEV | jq '.[].statistics.rx_pause_frames')check $? "$s" "1"s=$(ethtool -I --json -a $NSIM_NETDEV | jq '.[].statistics.tx_pause_frames')check $? "$s" "2" if [ $num_errors -eq 0 ]; then    echo "PASSED all $((num_passes)) checks"    exit 0else    echo "FAILED $num_errors/$((num_errors+num_passes)) checks"    exit 1fi