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Programmable Networks @ Multi-Terabit Scale
PremJonnalagadda,BarefootNetworks
DPDKUSSummit-SanJose-2016
Today, how can we ...
u Simplifyandscalethedataplaneofaswitch
u CreateandowndataplaneIntellectualProperty(IP)
u Getfullvisibilityintothedataplane
u Tailorthenetworktomeetspecificneeds
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Fixed Data Plane
Control Plane
Applications
Programmable Data Plane
Applications Programming
Language
Control Plane
“Control & Ownership down to the wire”
Evolution of Open Networking
“Control stops where Data Plane starts”
What networks need ...
Op
en
Op
en
X
3
Evolution of Programmable Hardware
C/C++/...
Compute
Compiler
Graphics
OpenGL/OpenCL/...
Compiler
Signal Processing
C++/Matlab/...
Compiler
Networking
? Compiler
?
“Networking is late to the game!”
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We need a couple of things ...
u ProgrammableSwitchArchitecture(PISATM)
u Givingend-usersaprogrammabletargetfortheirdataplane
u Industry-wideProgrammingLanguage(P4TM)
u Allowingend-userstodefineandmodifytheirdataplane
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PISATM Protocol Independent Switch Architecture
6
Pro
gra
mm
ab
le
Pars
er
Memory
Match Action
ALU
PISA Protocol Independent Switch Architecture
7
Pro
gra
mm
ab
le
Pars
er
Memory
Match Action
ALU
P4TM Programming Protocol-Independent Packet Processors
u High-levelprogramminglanguage
u Networkingdomainspecific
u Protocol/TargetIndependent
u GrowingadopSonandecosystem
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/*********************************************/ /* Router MAC lookup */ /*********************************************/ action rmac_hit() {
modify_field(l3_metadata.rmac_hit, TRUE); } action rmac_miss() {
modify_field(l3_metadata.rmac_hit, FALSE); } table rmac {
reads { l3_metadata.rmac_group : exact; l2_metadata.lkp_mac_da : exact; } actions { rmac_hit; rmac_miss; } size : ROUTER_MAC_TABLE_SIZE;
}
P4: Programming Language for Networking
“High-Level Programming Language for Programmable Networking across the Entire Network”
Transport - FPGA
Routers - NPU
Server Connectivity - NIC
Leaf & Spine - Switch ASIC & ASSP
OS - Kernel Networking
Hypervisor - vSwitch
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What does a P4 program look like?
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L2 IPv4
ACL MyEncap MyEncap IPv6
header_type ethernet_t {fields {
dstAddr : 48;srcAddr : 48;etherType : 16;
}}
parser parse_ethernet { extract(ethernet); return select(latest.etherType) { 0x8100 : parse_vlan; 0x800 : parse_ipv4; 0x86DD : parse_ipv6; 0xface : parse_my_encap; }}
TCP
IPv4 IPv6
MyEncap Eth
header_type my_encap_t {fields {
foo : 12;bar : 8;baz : 4;qux : 4; next_protocol : 4;
}}
What does a P4 program look like?
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L2 IPv4
ACL MyEncap MyEncap IPv6
table ipv4_lpm {
reads { ipv4.dstAddr : lpm; }
actions { set_next_hop; drop;
}}
action set_next_hop(nhop_ipv4_addr, port) {
modify_field(metadata.nhop_ipv4_addr, nhop_ipv4_addr); modify_field(standard_metadata.egress_port, port); add_to_field(ipv4.ttl, -1);
}
control ingress {
apply(l2);apply(my_encap);if (valid(ipv4) {
apply(ipv4_lpm);} else {
apply(ipv6_lpm);}apply(acl);
}
P4 and PISA
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P4 code
Compiler
Pro
gra
mm
ab
le
Pars
er
Compiler Target (PISA Device)
Networking enters the game
C/C++/...
Compute
Compiler
Graphics
OpenCL/...
Compiler
DSP
C/Matlab/...
Compiler
Networking
Compiler
Domain
Domain Specific Language
Compiler
Domain Specific Processor
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BarefootNetworksTofinoTM
Now we can ...
u Quicklyimplementnewprotocolsu Removeunnecessarycomplexityu Flexiblyassigntablememorytofeaturesu CreatenewdiagnosScs,telemetry,monitoringfuncSons,etc.u Composeforwardingbehaviorfromlibrariesu Specifyforwardingbehavioronce;compiletomanydevicesu KeepyourdataplaneIPfromgoingtoyourcompeStors
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P4 Language Consortium (P4.org)
u IndependentCAnon-profit
u MembershipisFREE
u Opensource
u Apache2.0CLA
u 46membersfromindustryandacademia
u Website:h^p://p4.org/join-us
u GitHub:h^ps://github.com/p4lang
u Workshops:June2015,Nov2015,May2016
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Developer Resources
u Specàh^p://p4.org/spec/u Compileràh^ps://github.com/p4lang/p4c-bmu L2/L3Switchàh^ps://github.com/p4lang/switch
u PacketTestFramework(PTF)àh^ps://github.com/p4lang/pa
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...muchmoreath^ps://github.com/p4lang
Get involved!
u JoinP4.org-h^p://p4.org/join-us
u TryP4developmenttoolsandprograms(switch.p4,INT,...)u IncludingP4-programmableS/Wswitchesandtestframework
u ExciSngappsfornetworkmonitoring,analysis,diagnosScs,andcontrol
u Jointhemailinglists-h^p://lists.p4.org
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Questions? [email protected]
