added action_profile example

examples/action_profile/p4src/action_profile.p4

@@ -0,0 +1,124 @@
+/*
+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.
+*/
+
+header_type ethernet_t {
+    fields {
+        dstAddr : 48;
+        srcAddr : 48;
+        etherType : 16;
+    }
+}
+
+header_type ipv4_t {
+    fields {
+        version : 4;
+        ihl : 4;
+        diffserv : 8;
+        totalLen : 16;
+        identification : 16;
+        flags : 3;
+        fragOffset : 13;
+        ttl : 8;
+        protocol : 8;
+        hdrChecksum : 16;
+        srcAddr : 32;
+        dstAddr: 32;
+    }
+}
+
+header_type intrinsic_metadata_t {
+    fields {
+        mcast_grp : 4;
+        egress_rid : 4;
+        mcast_hash : 16;
+        lf_field_list: 32;
+    }
+}
+
+parser start {
+    return parse_ethernet;
+}
+
+header ethernet_t ethernet;
+header ipv4_t ipv4;
+metadata intrinsic_metadata_t intrinsic_metadata;
+
+#define ETHERTYPE_IPV4 0x0800
+
+parser parse_ethernet {
+    extract(ethernet);
+    return select(ethernet.etherType) {
+        ETHERTYPE_IPV4: parse_ipv4;
+        default: ingress;
+    }
+}
+
+parser parse_ipv4 {
+    extract(ipv4);
+    return ingress;
+}
+
+action _drop() {
+    drop();
+}
+
+action _nop() {
+}
+
+field_list l3_hash_fields {
+    ipv4.srcAddr;
+    ipv4.protocol;
+}
+
+field_list_calculation ecmp_hash {
+    input {
+        l3_hash_fields;
+    }
+    algorithm : bmv2_hash;
+    output_width : 16;
+}
+
+action_selector ecmp_selector {
+    selection_key : ecmp_hash;
+}
+
+action set_ecmp_nexthop(port) {
+    modify_field(standard_metadata.egress_spec, port);
+}
+
+action_profile ecmp_action_profile {
+    actions {
+        _nop;
+        set_ecmp_nexthop;
+    }
+    size : 64;
+    dynamic_action_selection : ecmp_selector;
+}
+
+table ecmp_group {
+    reads {
+        ipv4.dstAddr : exact;
+    }
+    action_profile: ecmp_action_profile;
+    size : 1024;
+}
+
+control ingress {
+    apply(ecmp_group);
+}
+
+control egress {
+}