adde flowlet_switching exercise

SIGCOMM_2015/flowlet_switching/p4src/includes/headers.p4

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+/*
+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 tcp_t {
+    fields {
+        srcPort : 16;
+        dstPort : 16;
+        seqNo : 32;
+        ackNo : 32;
+        dataOffset : 4;
+        res : 3;
+        ecn : 3;
+        ctrl : 6;
+        window : 16;
+        checksum : 16;
+        urgentPtr : 16;
+    }
+}

SIGCOMM_2015/flowlet_switching/p4src/includes/intrinsic.p4

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+/*
+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 intrinsic_metadata_t {
+    fields {
+        ingress_global_timestamp : 48;
+        lf_field_list : 32;
+        mcast_grp : 16;
+        egress_rid : 16;
+    }
+}
+
+metadata intrinsic_metadata_t intrinsic_metadata;

SIGCOMM_2015/flowlet_switching/p4src/includes/parser.p4

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+/*
+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.
+*/
+
+parser start {
+    return parse_ethernet;
+}
+
+#define ETHERTYPE_IPV4 0x0800
+
+header ethernet_t ethernet;
+
+parser parse_ethernet {
+    extract(ethernet);
+    return select(latest.etherType) {
+        ETHERTYPE_IPV4 : parse_ipv4;
+        default: ingress;
+    }
+}
+
+header ipv4_t ipv4;
+
+field_list ipv4_checksum_list {
+        ipv4.version;
+        ipv4.ihl;
+        ipv4.diffserv;
+        ipv4.totalLen;
+        ipv4.identification;
+        ipv4.flags;
+        ipv4.fragOffset;
+        ipv4.ttl;
+        ipv4.protocol;
+        ipv4.srcAddr;
+        ipv4.dstAddr;
+}
+
+field_list_calculation ipv4_checksum {
+    input {
+        ipv4_checksum_list;
+    }
+    algorithm : csum16;
+    output_width : 16;
+}
+
+calculated_field ipv4.hdrChecksum  {
+    verify ipv4_checksum;
+    update ipv4_checksum;
+}
+
+#define IP_PROTOCOLS_TCP 6
+
+parser parse_ipv4 {
+    extract(ipv4);
+    return select(latest.protocol) {
+        IP_PROTOCOLS_TCP : parse_tcp;
+        default: ingress;
+    }
+}
+
+header tcp_t tcp;
+
+parser parse_tcp {
+    extract(tcp);
+    return ingress;
+}

SIGCOMM_2015/flowlet_switching/p4src/simple_router.p4

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+/*
+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.
+*/
+
+#include "includes/headers.p4"
+#include "includes/parser.p4"
+#include "includes/intrinsic.p4"
+
+header_type ingress_metadata_t {
+    fields {
+        ecmp_offset : 14; // offset into the ecmp table
+
+        nhop_ipv4 : 32;
+
+        // TODO: add your flowlet metadata here
+    }
+}
+
+metadata ingress_metadata_t ingress_metadata;
+
+action _drop() {
+    drop();
+}
+
+action set_nhop(nhop_ipv4, port) {
+    modify_field(ingress_metadata.nhop_ipv4, nhop_ipv4);
+    modify_field(standard_metadata.egress_spec, port);
+    add_to_field(ipv4.ttl, -1);
+}
+
+#define ECMP_BIT_WIDTH 10
+#define ECMP_GROUP_TABLE_SIZE 1024
+#define ECMP_NHOP_TABLE_SIZE 16384
+
+// TODO: add flowlet id to hash fields
+
+field_list l3_hash_fields {
+    ipv4.srcAddr;
+    ipv4.dstAddr;
+    ipv4.protocol;
+    tcp.srcPort;
+    tcp.dstPort;
+}
+
+field_list_calculation ecmp_hash {
+    input {
+        l3_hash_fields;
+    }
+    algorithm : crc16;
+    output_width : ECMP_BIT_WIDTH;
+}
+
+
+action set_ecmp_select(ecmp_base, ecmp_count) {
+    modify_field_with_hash_based_offset(ingress_metadata.ecmp_offset, ecmp_base,
+                                        ecmp_hash, ecmp_count);
+}
+
+table ecmp_group {
+    reads {
+        ipv4.dstAddr : lpm;
+    }
+    actions {
+        _drop;
+        set_ecmp_select;
+    }
+    size : ECMP_GROUP_TABLE_SIZE;
+}
+
+table ecmp_nhop {
+    reads {
+        ingress_metadata.ecmp_offset : exact;
+    }
+    actions {
+        _drop;
+        set_nhop;
+    }
+    size : ECMP_NHOP_TABLE_SIZE;
+}
+
+action set_dmac(dmac) {
+    modify_field(ethernet.dstAddr, dmac);
+}
+
+table forward {
+    reads {
+        ingress_metadata.nhop_ipv4 : exact;
+    }
+    actions {
+        set_dmac;
+        _drop;
+    }
+    size: 512;
+}
+
+action rewrite_mac(smac) {
+    modify_field(ethernet.srcAddr, smac);
+}
+
+table send_frame {
+    reads {
+        standard_metadata.egress_port: exact;
+    }
+    actions {
+        rewrite_mac;
+        _drop;
+    }
+    size: 256;
+}
+
+control ingress {
+    // TODO: flowlet switching
+    apply(ecmp_group);
+    apply(ecmp_nhop);
+    apply(forward);
+}
+
+control egress {
+    apply(send_frame);
+}