1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0
3
4 ALL_TESTS="
5 rmon_rx_histogram
6 rmon_tx_histogram
7 "
8
9 NUM_NETIFS=2
10 lib_dir=$(dirname "$0")
11 source "$lib_dir"/../../../net/forwarding/lib.sh
12
13 ETH_FCS_LEN=4
14 ETH_HLEN=$((6+6+2))
15
16 declare -A netif_mtu
17
18 ensure_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
30 bucket_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
68 rmon_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
103 rmon_rx_histogram()
104 {
105 rmon_histogram $h1 $h2 rx
106 rmon_histogram $h2 $h1 rx
107 }
108
109 rmon_tx_histogram()
110 {
111 rmon_histogram $h1 $h2 tx
112 rmon_histogram $h2 $h1 tx
113 }
114
115 setup_prepare()
116 {
117 h1=${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
126 cleanup()
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
137 check_ethtool_counter_group_support
138 trap cleanup EXIT
139
140 setup_prepare
141 setup_wait
142
143 tests_run
144
145 exit $EXIT_STATUS
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.