tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh

   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