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
146