ethtool_rmon.sh

  1#!/bin/bash
  2# SPDX-License-Identifier: GPL-2.0
  3
  4ALL_TESTS="
  5	rmon_rx_histogram
  6	rmon_tx_histogram
  7"
  8
  9NUM_NETIFS=2
 10lib_dir=$(dirname "$0")
 11source "$lib_dir"/../../../net/forwarding/lib.sh
 12
 13ETH_FCS_LEN=4
 14ETH_HLEN=$((6+6+2))
 15
 16declare -A netif_mtu
 17
 18ensure_mtu()
 19{
 20	local iface=$1; shift
 21	local len=$1; shift
 22	local current=$(ip -j link show dev $iface | jq -r '.[0].mtu')
 23	local required=$((len - ETH_HLEN - ETH_FCS_LEN))
 24
 25	if [ $current -lt $required ]; then
 26		ip link set dev $iface mtu $required || return 1
 27	fi
 28}
 29
 30bucket_test()
 31{
 32	local iface=$1; shift
 33	local neigh=$1; shift
 34	local set=$1; shift
 35	local bucket=$1; shift
 36	local len=$1; shift
 37	local num_rx=10000
 38	local num_tx=20000
 39	local expected=
 40	local before=
 41	local after=
 42	local delta=
 43
 44	# Mausezahn does not include FCS bytes in its length - but the
 45	# histogram counters do
 46	len=$((len - ETH_FCS_LEN))
 47	len=$((len > 0 ? len : 0))
 48
 49	before=$(ethtool --json -S $iface --groups rmon | \
 50		jq -r ".[0].rmon[\"${set}-pktsNtoM\"][$bucket].val")
 51
 52	# Send 10k one way and 20k in the other, to detect counters
 53	# mapped to the wrong direction
 54	$MZ $neigh -q -c $num_rx -p $len -a own -b bcast -d 10us
 55	$MZ $iface -q -c $num_tx -p $len -a own -b bcast -d 10us
 56
 57	after=$(ethtool --json -S $iface --groups rmon | \
 58		jq -r ".[0].rmon[\"${set}-pktsNtoM\"][$bucket].val")
 59
 60	delta=$((after - before))
 61
 62	expected=$([ $set = rx ] && echo $num_rx || echo $num_tx)
 63
 64	# Allow some extra tolerance for other packets sent by the stack
 65	[ $delta -ge $expected ] && [ $delta -le $((expected + 100)) ]
 66}
 67
 68rmon_histogram()
 69{
 70	local iface=$1; shift
 71	local neigh=$1; shift
 72	local set=$1; shift
 73	local nbuckets=0
 74	local step=
 75
 76	RET=0
 77
 78	while read -r -a bucket; do
 79		step="$set-pkts${bucket[0]}to${bucket[1]} on $iface"
 80
 81		for if in $iface $neigh; do
 82			if ! ensure_mtu $if ${bucket[0]}; then
 83				log_test_xfail "$if does not support the required MTU for $step"
 84				return
 85			fi
 86		done
 87
 88		if ! bucket_test $iface $neigh $set $nbuckets ${bucket[0]}; then
 89			check_err 1 "$step failed"
 90			return 1
 91		fi
 92		log_test "$step"
 93		nbuckets=$((nbuckets + 1))
 94	done < <(ethtool --json -S $iface --groups rmon | \
 95		jq -r ".[0].rmon[\"${set}-pktsNtoM\"][]|[.low, .high]|@tsv" 2>/dev/null)
 96
 97	if [ $nbuckets -eq 0 ]; then
 98		log_test_xfail "$iface does not support $set histogram counters"
 99		return
100	fi
101}
102
103rmon_rx_histogram()
104{
105	rmon_histogram $h1 $h2 rx
106	rmon_histogram $h2 $h1 rx
107}
108
109rmon_tx_histogram()
110{
111	rmon_histogram $h1 $h2 tx
112	rmon_histogram $h2 $h1 tx
113}
114
115setup_prepare()
116{
117	h1=${NETIFS[p1]}
118	h2=${NETIFS[p2]}
119
120	for iface in $h1 $h2; do
121		netif_mtu[$iface]=$(ip -j link show dev $iface | jq -r '.[0].mtu')
122		ip link set dev $iface up
123	done
124}
125
126cleanup()
127{
128	pre_cleanup
129
130	for iface in $h2 $h1; do
131		ip link set dev $iface \
132			mtu ${netif_mtu[$iface]} \
133			down
134	done
135}
136
137check_ethtool_counter_group_support
138trap cleanup EXIT
139
140setup_prepare
141setup_wait
142
143tests_run
144
145exit $EXIT_STATUS