tools/testing/selftests/net/busy_poll_test.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 source net_helper.sh
   4
   5 NSIM_SV_ID=$((256 + RANDOM % 256))
   6 NSIM_SV_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_SV_ID
   7 NSIM_CL_ID=$((512 + RANDOM % 256))
   8 NSIM_CL_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_CL_ID
   9
  10 NSIM_DEV_SYS_NEW=/sys/bus/netdevsim/new_device
  11 NSIM_DEV_SYS_DEL=/sys/bus/netdevsim/del_device
  12 NSIM_DEV_SYS_LINK=/sys/bus/netdevsim/link_device
  13 NSIM_DEV_SYS_UNLINK=/sys/bus/netdevsim/unlink_device
  14
  15 SERVER_IP=192.168.1.1
  16 CLIENT_IP=192.168.1.2
  17 SERVER_PORT=48675
  18
  19 # busy poll config
  20 MAX_EVENTS=8
  21 BUSY_POLL_USECS=0
  22 BUSY_POLL_BUDGET=16
  23 PREFER_BUSY_POLL=1
  24
  25 # IRQ deferral config
  26 NAPI_DEFER_HARD_IRQS=100
  27 GRO_FLUSH_TIMEOUT=50000
  28 SUSPEND_TIMEOUT=20000000
  29
  30 setup_ns()
  31 {
  32         set -e
  33         ip netns add nssv
  34         ip netns add nscl
  35
  36         NSIM_SV_NAME=$(find $NSIM_SV_SYS/net -maxdepth 1 -type d ! \
  37                 -path $NSIM_SV_SYS/net -exec basename {} \;)
  38         NSIM_CL_NAME=$(find $NSIM_CL_SYS/net -maxdepth 1 -type d ! \
  39                 -path $NSIM_CL_SYS/net -exec basename {} \;)
  40
  41         # ensure the server has 1 queue
  42         ethtool -L $NSIM_SV_NAME combined 1 2>/dev/null
  43
  44         ip link set $NSIM_SV_NAME netns nssv
  45         ip link set $NSIM_CL_NAME netns nscl
  46
  47         ip netns exec nssv ip addr add "${SERVER_IP}/24" dev $NSIM_SV_NAME
  48         ip netns exec nscl ip addr add "${CLIENT_IP}/24" dev $NSIM_CL_NAME
  49
  50         ip netns exec nssv ip link set dev $NSIM_SV_NAME up
  51         ip netns exec nscl ip link set dev $NSIM_CL_NAME up
  52
  53         set +e
  54 }
  55
  56 cleanup_ns()
  57 {
  58         ip netns del nscl
  59         ip netns del nssv
  60 }
  61
  62 test_busypoll()
  63 {
  64         suspend_value=${1:-0}
  65         tmp_file=$(mktemp)
  66         out_file=$(mktemp)
  67
  68         # fill a test file with random data
  69         dd if=/dev/urandom of=${tmp_file} bs=1M count=1 2> /dev/null
  70
  71         timeout -k 1s 30s ip netns exec nssv ./busy_poller         \
  72                                              -p${SERVER_PORT}      \
  73                                              -b${SERVER_IP}        \
  74                                              -m${MAX_EVENTS}       \
  75                                              -u${BUSY_POLL_USECS}  \
  76                                              -P${PREFER_BUSY_POLL} \
  77                                              -g${BUSY_POLL_BUDGET} \
  78                                              -i${NSIM_SV_IFIDX}    \
  79                                              -s${suspend_value}    \
  80                                              -o${out_file}&
  81
  82         wait_local_port_listen nssv ${SERVER_PORT} tcp
  83
  84         ip netns exec nscl socat -u $tmp_file TCP:${SERVER_IP}:${SERVER_PORT}
  85
  86         wait
  87
  88         tmp_file_md5sum=$(md5sum $tmp_file | cut -f1 -d' ')
  89         out_file_md5sum=$(md5sum $out_file | cut -f1 -d' ')
  90
  91         if [ "$tmp_file_md5sum" = "$out_file_md5sum" ]; then
  92                 res=0
  93         else
  94                 echo "md5sum mismatch"
  95                 echo "input file md5sum: ${tmp_file_md5sum}";
  96                 echo "output file md5sum: ${out_file_md5sum}";
  97                 res=1
  98         fi
  99
 100         rm $out_file $tmp_file
 101
 102         return $res
 103 }
 104
 105 test_busypoll_with_suspend()
 106 {
 107         test_busypoll ${SUSPEND_TIMEOUT}
 108
 109         return $?
 110 }
 111
 112 ###
 113 ### Code start
 114 ###
 115
 116 modprobe netdevsim
 117
 118 # linking
 119
 120 echo $NSIM_SV_ID > $NSIM_DEV_SYS_NEW
 121 echo $NSIM_CL_ID > $NSIM_DEV_SYS_NEW
 122 udevadm settle
 123
 124 setup_ns
 125
 126 NSIM_SV_FD=$((256 + RANDOM % 256))
 127 exec {NSIM_SV_FD}</var/run/netns/nssv
 128 NSIM_SV_IFIDX=$(ip netns exec nssv cat /sys/class/net/$NSIM_SV_NAME/ifindex)
 129
 130 NSIM_CL_FD=$((256 + RANDOM % 256))
 131 exec {NSIM_CL_FD}</var/run/netns/nscl
 132 NSIM_CL_IFIDX=$(ip netns exec nscl cat /sys/class/net/$NSIM_CL_NAME/ifindex)
 133
 134 echo "$NSIM_SV_FD:$NSIM_SV_IFIDX $NSIM_CL_FD:$NSIM_CL_IFIDX" > \
 135      $NSIM_DEV_SYS_LINK
 136
 137 if [ $? -ne 0 ]; then
 138         echo "linking netdevsim1 with netdevsim2 should succeed"
 139         cleanup_ns
 140         exit 1
 141 fi
 142
 143 test_busypoll
 144 if [ $? -ne 0 ]; then
 145         echo "test_busypoll failed"
 146         cleanup_ns
 147         exit 1
 148 fi
 149
 150 test_busypoll_with_suspend
 151 if [ $? -ne 0 ]; then
 152         echo "test_busypoll_with_suspend failed"
 153         cleanup_ns
 154         exit 1
 155 fi
 156
 157 echo "$NSIM_SV_FD:$NSIM_SV_IFIDX" > $NSIM_DEV_SYS_UNLINK
 158
 159 echo $NSIM_CL_ID > $NSIM_DEV_SYS_DEL
 160
 161 cleanup_ns
 162
 163 modprobe -r netdevsim
 164
 165 exit 0