133 lines
2.6 KiB
Plaintext
133 lines
2.6 KiB
Plaintext
/*
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Copyright 2013-present Barefoot Networks, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "includes/headers.p4"
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#include "includes/parser.p4"
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#include "includes/intrinsic.p4"
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header_type ingress_metadata_t {
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fields {
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ecmp_offset : 14; // offset into the ecmp table
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nhop_ipv4 : 32;
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// TODO: add your flowlet metadata here
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}
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}
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metadata ingress_metadata_t ingress_metadata;
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action _drop() {
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drop();
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}
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action set_nhop(nhop_ipv4, port) {
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modify_field(ingress_metadata.nhop_ipv4, nhop_ipv4);
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modify_field(standard_metadata.egress_spec, port);
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add_to_field(ipv4.ttl, -1);
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}
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#define ECMP_BIT_WIDTH 10
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#define ECMP_GROUP_TABLE_SIZE 1024
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#define ECMP_NHOP_TABLE_SIZE 16384
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// TODO: add flowlet id to hash fields
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field_list l3_hash_fields {
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ipv4.srcAddr;
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ipv4.dstAddr;
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ipv4.protocol;
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tcp.srcPort;
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tcp.dstPort;
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}
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field_list_calculation ecmp_hash {
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input {
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l3_hash_fields;
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}
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algorithm : crc16;
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output_width : ECMP_BIT_WIDTH;
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}
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action set_ecmp_select(ecmp_base, ecmp_count) {
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modify_field_with_hash_based_offset(ingress_metadata.ecmp_offset, ecmp_base,
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ecmp_hash, ecmp_count);
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}
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table ecmp_group {
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reads {
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ipv4.dstAddr : lpm;
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}
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actions {
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_drop;
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set_ecmp_select;
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}
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size : ECMP_GROUP_TABLE_SIZE;
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}
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table ecmp_nhop {
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reads {
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ingress_metadata.ecmp_offset : exact;
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}
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actions {
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_drop;
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set_nhop;
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}
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size : ECMP_NHOP_TABLE_SIZE;
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}
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action set_dmac(dmac) {
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modify_field(ethernet.dstAddr, dmac);
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}
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table forward {
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reads {
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ingress_metadata.nhop_ipv4 : exact;
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}
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actions {
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set_dmac;
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_drop;
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}
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size: 512;
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}
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action rewrite_mac(smac) {
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modify_field(ethernet.srcAddr, smac);
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}
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table send_frame {
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reads {
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standard_metadata.egress_port: exact;
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}
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actions {
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rewrite_mac;
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_drop;
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}
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size: 256;
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}
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control ingress {
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// TODO: flowlet switching
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apply(ecmp_group);
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apply(ecmp_nhop);
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apply(forward);
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}
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control egress {
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apply(send_frame);
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}
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