added simple_nat example

examples/simple_nat/run_demo.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+
+# Copyright 2013-present Barefoot Networks, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+if [[ $EUID -ne 0 ]]; then
+    echo "This script should be run using sudo or as the root user"
+    exit 1
+fi
+
+THIS_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+
+source $THIS_DIR/../env.sh
+
+P4C_BM_SCRIPT=$P4C_BM_PATH/p4c_bm/__main__.py
+
+SWITCH_PATH=$BMV2_PATH/targets/simple_switch/simple_switch
+
+CLI_PATH=$BMV2_PATH/targets/simple_switch/sswitch_CLI
+
+# create CPU port
+intf0="cpu-veth-0"
+intf1="cpu-veth-1"
+if ! ip link show $intf0 &> /dev/null; then
+    ip link add name $intf0 type veth peer name $intf1
+    ip link set dev $intf0 up
+    ip link set dev $intf1 up
+    TOE_OPTIONS="rx tx sg tso ufo gso gro lro rxvlan txvlan rxhash"
+    for TOE_OPTION in $TOE_OPTIONS; do
+        /sbin/ethtool --offload $intf0 "$TOE_OPTION" off
+        /sbin/ethtool --offload $intf1 "$TOE_OPTION" off
+    done
+fi
+sysctl net.ipv6.conf.$intf0.disable_ipv6=1
+sysctl net.ipv6.conf.$intf1.disable_ipv6=1
+
+$P4C_BM_SCRIPT p4src/simple_nat.p4 --json simple_nat.json
+PYTHONPATH=$PYTHONPATH:$BMV2_PATH/mininet/ python topo.py \
+    --behavioral-exe $BMV2_PATH/targets/simple_switch/simple_switch \
+    --json simple_nat.json \
+    --cli $CLI_PATH \
+    --thrift-port 22222