Session ID: BUD17-107 Session Name: PCI-e EndPoint mode of operation in OpenDataPlane(ODP) - BUD17-107 Speaker: Narayana Prasad Athreya Track: LNG ★ Session Summary ★ A proposal to add ODP based support for PCI-e Endpoint mode of operation. In the Endpoint mode the ODP implementation runs on the Endpoint device while the Root Complex(PCI-e host) will appear as a peripheral device. The proposal outlines 2 ways in which the Root Complex can be registered with ODP: A. As a NIC device B. As a Co-processor. The initial implementation will target Cavium OCTEON TX SoC --------------------------------------------------- ★ Resources ★ Event Page: http://connect.linaro.org/resource/bud17/bud17-107/ Presentation: Video: https://youtu.be/tQo7sbQbeI0 --------------------------------------------------- ★ Event Details ★ Linaro Connect Budapest 2017 (BUD17) 6-10 March 2017 Corinthia Hotel, Budapest, Erzsébet krt. 43-49, 1073 Hungary --------------------------------------------------- Keyword: LNG, PCI-e, ODP, Narayana Prasad Athreya http://www.linaro.org http://connect.linaro.org --------------------------------------------------- Follow us on Social Media https://www.facebook.com/LinaroOrg https://twitter.com/linaroorg https://www.youtube.com/user/linaroorg?sub_confirmation=1 https://www.linkedin.com/company/1026961

1. PCI-e EndPoint support in
OpenDataPlane(ODP)
Narayana Prasad Athreya
Linaro Connect BUD17

2. Background
• What is PCI-e EndPoint?
• Target mode in PCI-express.
• Common devices - NIC, Graphic Cards, Security
Coprocessors
• The PCI-e channel can be used for control or data plane.
• What is OpenDataPlane?
• Networking data plane API specification
• Allows portable data plane applications to leverage vendor
specific hardware.

3. Conventional ODP Usage
• Runs on standalone data
plane processor
• ODP application is Bus
Master and owns the
hardware
• ODP application’s control
plane interface is not
guided by ODP
Specification.

4. ODP on a target device
• ODP runs on a co-
processor
• ODP application is a PCI-e
slave.
• ODP application’s control
plane interface overlaps
with data plane

5. Content on the PCI-e bus
• Networks Packet with L2,L3,etc headers
Two types of data exchange are possible:
• Custom message - typically as a request/response

6. PCI-e EP as NIC
• Logical fit to ODP
• Register PCI-e EP as a
packet-io
• ODP API allow seamless
send/recv of packets

7. PCI-e EP as a Coprocessor
• Host projected as a
coprocessor to ODP
• Register PCI-e EP as a
packet-io with an event
queue.
• ODP API allow coprocessor
interface using events

8. OCTEON as a PCI-e EP running NIC application

9. Status
• Packet and Message exchanges
• Work in progress to adopt NIC firmware application to use
ODP interface use PCI-e as a packet interface as well as a
control plane coprocessor.
• Roadmap
• Run performance benchmarks with NIC firmware running
over ODP and compare against non-ODP NIC firmware
implementations.

10. Narayana Prasad Athreya
Prasad.Athreya@Cavium.com
Q & A