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common_ack.p4
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// Const defs
const bit<16> TYPE_IPV4 = 0x0800;
const bit<8> IPV4_PROTOCOL_UDP = 0x11;
const bit<8> PMSWITCH_OPCODE_INVALID = 0x00; // Not used
const bit<8> PMSWITCH_OPCODE_PERSIST_NEED_ACK = 0x01; // Persist using PMSwitch Protocol
const bit<8> PMSWITCH_OPCODE_ACK = 0x02; // Ack from other switch
const bit<8> PMSWITCH_OPCODE_REPONSE = 0x03; // Response from the server
const bit<8> PMSWITCH_OPCODE_BYPASS = 0x04;
const bit<8> PMSWITCH_OPCODE_RECOVER = 0x05; // Recovery request
const bit<8> PMSWITCH_OPCODE_CACHE_RESPONSE = 0x06; // Response from the cache
const bit<8> PMSWITCH_OPCODE_NOOP = 0xFF; // NO-OP, just forward whatever in the pipeline
const bit<16> PMSWITCH_PORT = 51000; // Reserved port number
const bit<16> PMSWITCH_PORT_2 = 51001; // Reserved port number
const bit<16> PMSWITCH_PORT_3 = 51002; // Reserved port number
const bit<16> PMSWITCH_PORT_4 = 51003; // Reserved port number
// Valid address starts from 0x80000000 to 0xFFFFFFFF
const bit<32> INVALID_ADDR = 0x7FFFFFFF; // For debug purpose.
typedef bit<48> MacAddress;
typedef bit<32> IPv4Address;
// Headers-------------------
// SOF
// Ethernet header 14 Bytes
header ethernet_h {
MacAddress dst;
MacAddress src;
bit<16> type;
}
// IPv4 header 20 Bytes
header ipv4_h {
bit<4> version;
bit<4> ihl;
bit<8> tos;
bit<16> len;
bit<16> id;
bit<3> flags;
bit<13> frag;
bit<8> ttl;
bit<8> proto;
bit<16> chksum;
IPv4Address src;
IPv4Address dst;
}
// 34 Bytes
// UDP header 8 Bytes
header udp_h {
bit<16> sport;
bit<16> dport;
bit<16> len;
bit<16> chksum;
}
// 42 Bytes
// PMSwitch header 12+2 Bytes
header pmswitchhds_h {
bit<8> type; // Type of PMSwitch package: PERSIST_NEED_ACK, BYPASS or ACK_PERSIST
bit<8> ackCount; // Ack count, used to track number of Ack required to remove the packet from the memory.
bit<16> session_id; // Session ID for each client ---| Used as request identifier
bit<32> seq_no; // Sequence Number for each request ---|
// 50 // The offset of PMAddress.
bit<32> PMAddress; // Hashed identifier, used as address
// 54
bit<16> padding; // Padding to make the payload 8-byte aligned
}
// 56 Bytes
// Payload
// Total size must not exceed 1024 bytes.
// EOF
// --------------------------
// Struct of all headers
struct headers {
ethernet_h ethernet;
ipv4_h ipv4;
udp_h udp;
pmswitchhds_h pmswitchhds;
}
// Common parser shared by both Request and Ack paths
// Xilinx-specific max packet size primitive
@Xilinx_MaxPacketRegion(1500*8) // in bits
parser PMSwitch_ack_Parser(packet_in pkt,
out headers hdr){
state start {
pkt.extract(hdr.ethernet);
transition select(hdr.ethernet.type) {
TYPE_IPV4 : parse_ipv4;
default : accept;
}
}
state parse_ipv4 {
pkt.extract(hdr.ipv4);
transition select(hdr.ipv4.proto) {
IPV4_PROTOCOL_UDP : parse_udp_sport;
default : accept;
}
}
state parse_udp_sport {
pkt.extract(hdr.udp);
transition select(hdr.udp.sport){
51000 : parse_PMSwitch;
51001 : parse_PMSwitch;
51002 : parse_PMSwitch;
51003 : parse_PMSwitch;
51004 : parse_PMSwitch;
51005 : parse_PMSwitch;
51006 : parse_PMSwitch;
51007 : parse_PMSwitch;
51008 : parse_PMSwitch;
51009 : parse_PMSwitch;
51010 : parse_PMSwitch;
51011 : parse_PMSwitch;
51012 : parse_PMSwitch;
51013 : parse_PMSwitch;
51014 : parse_PMSwitch;
51015 : parse_PMSwitch;
51016 : parse_PMSwitch;
51017 : parse_PMSwitch;
51018 : parse_PMSwitch;
51019 : parse_PMSwitch;
51020 : parse_PMSwitch;
51021 : parse_PMSwitch;
51022 : parse_PMSwitch;
51023 : parse_PMSwitch;
51024 : parse_PMSwitch;
51025 : parse_PMSwitch;
51026 : parse_PMSwitch;
51027 : parse_PMSwitch;
51028 : parse_PMSwitch;
51029 : parse_PMSwitch;
51030 : parse_PMSwitch;
51031 : parse_PMSwitch;
51032 : parse_PMSwitch;
51033 : parse_PMSwitch;
51034 : parse_PMSwitch;
51035 : parse_PMSwitch;
51036 : parse_PMSwitch;
51037 : parse_PMSwitch;
51038 : parse_PMSwitch;
51039 : parse_PMSwitch;
51040 : parse_PMSwitch;
51041 : parse_PMSwitch;
51042 : parse_PMSwitch;
51043 : parse_PMSwitch;
51044 : parse_PMSwitch;
51045 : parse_PMSwitch;
51046 : parse_PMSwitch;
51047 : parse_PMSwitch;
51048 : parse_PMSwitch;
51049 : parse_PMSwitch;
51050 : parse_PMSwitch;
51051 : parse_PMSwitch;
51052 : parse_PMSwitch;
51053 : parse_PMSwitch;
51054 : parse_PMSwitch;
51055 : parse_PMSwitch;
51056 : parse_PMSwitch;
51057 : parse_PMSwitch;
51058 : parse_PMSwitch;
51059 : parse_PMSwitch;
51060 : parse_PMSwitch;
51061 : parse_PMSwitch;
51062 : parse_PMSwitch;
51063 : parse_PMSwitch;
default : accept;
}
}
// If either host or dest port match reserved port number, parse the PMSwtich packet.
state parse_PMSwitch{
pkt.extract(hdr.pmswitchhds);
transition accept;
}
}
// Common Deparser
@Xilinx_MaxPacketRegion(1500*8) // in bits
control PMSwitch_ack_Deparser(in headers hdr, packet_out packet) {
apply {
packet.emit(hdr.ethernet);
packet.emit(hdr.ipv4);
packet.emit(hdr.udp);
packet.emit(hdr.pmswitchhds);
}
}