1. Update Summary of DPACC docs
2016/3/4

2. Quick Summary Work-in-progress docs New doc for API guidelines
Dpacc architecture:
No new major issues. Plan to migrate to gerrit next week.
OpenStack Gap Analysis:
No new input this week. Renaming issue raised online.
Plan to bring to review after completion of Section 5 next week.
Dpacc usecase: detailed discussion later.
New doc for API guidelines
Y/edit?usp=sharing
Based on the proposal and discussion last week
Working on addressing comments and welcome more review and feedback
Plan to bring to review next week

3. Latest Update DPACC Use-cases
Qh37GKs6N6rRYDVNM/edit
4/19/2019

4. Update Summary Introduction Terminology
Added e2e mobile network figure to clarify different categories of acceleration applications
Introduction
Terminology
Acceleration Models: Lookaside Model, Offload Model (Inline Model), External Model (Data Path Offload Model)
Virtualized Acceleration Interfaces: Passthrough-based Acceleration & Virtio-based Acceleration
Virtio-lookaside Acceleration & virtio-inline acceleration
Targeting Applications: SmallCell Gateway. IPSec between vRAN and vEPC, VRAN
IPsec Packet Processing Acceleration
NFVI Packet Processing Acceleration
PDCP Packet Processing Acceleration
Use-cases
IPsec  Look Aside Accelerator
NFVI Packet Processing Offload Accelerator
Combined NFVI Inline and IPsec LA Accelerator
NFVI and IPsec Offload Accelerator
PDCP Offload Accelerator
vRAN application description refined.
Refined figures for both IPSec la and PDCP la usec-case.

5. Discussion Point #1 Terminology
RAN Radio Access Network
RRU Remote Radio Unit
eNB E-UTRAN NodeB
UE User Equipment
L1/2/3 Layer 1/2/3
DL Downlink
UL Uplink
IP Internet Protocol
LTE Long Term Evolution
MAC Medium Access Control
RLC Radio Link Control
PDCP Packet Data Convergence Protocol
RRC Radio Resource Control
FFT Fast Fourier Transform
iFFT Inverse Fast Fourier Transform
DFT Discrete Fourier Transform
iDFT Inverse Discrete Fourier Transform
UL Uplink

6. Discussion Point 2: Targeting applications End2End Mobile Traffic Path (Mobile Carrier)
Mobile Carrier Domain ① ② ③

7. Discussion Point 2: Targeting applications DPACC Applications (Mobile Carrier)

8. Revised traffic input to PDCP
Discussion Point 3: Targeting applications vRAN (LTE Stack illustration & Accelerator models)
Revised traffic input to PDCP
Look aside
Look aside
Inline (offload)
Vineet: the leftmost should be changed into GTP. Which can also be accelerated via hardware offload. Fixed.
Ola: the traffic going directly to PDCP block should be raw data traffic. Fixed.
Two types of look-aside accelerator identified
Added into Section 2.1 as examples;
Clarifications added in Section 4.3.
One types of offload accelerator identified
Added into Section 2.2 as examples;
Clarifications added in Section 4.3.
Previous version

9. Discussion Point 4: Use-cases IPSec Lookaside Acceleration
User
host
IPsec Accelerator HW
SAL
IPSec g-driver
sio-backend (vHost-user)
guest
App IPsec
App F1
Clear packet
Encrypted packet
Figure X IPsec Packet Processing – Look Aside Accelerator Flow
g-API
Acceleration Core
sio + Virtio
hio
s-api
Virtio-net
Frontend
App F2
Kernel
Vhost-net backend
NFVI Packet
Processing
Physical ports
Virtio-IPsec Look-aside
Ola: What is F1 or F2 for? Rajesh: basic routing function.
Ola: are you indicating that virtio-only proposal in dpacc. Lingli: No.
Previous version

10. Discussion Point 4: Use-cases PDCP Lookaside Acceleration (Updated)
VNF – PDCP Application
g-API 9 9 8 8
SAL
guest 2 2 3 3
virtio-net frontend
virtio-la-pdcp frontend
sio 7 7 4 4
virtio-net
virtio-la-pdcp backend + vHost-user 10 10 6 6
SAL 5 5
host
SW Accelerator
Ola: SW accelerator for PDCP in the host? VNF can contain a SW accelerator itself.
Rajesh: SW implementation in the host for a backup if no HW accelerator is present, in case of migration.
Arun: live migration mechanism discussion later (previous document) 1 1
hio
device
HW (NIC)
HW Accelerator (Crypto) UE
Backplane Processing RLC/MAC/PHY
Backhaul Processing GTPU/IPSec/QoS
EPC
Downlink
Uplink
Previous version

11. Todos Address remaining issues online Call for review and feedback
Keep on working description of existing applications/use-cases
Keep on working on other usecase figures
Call for review and feedback
Anything missing?

12. backup

13. Targeting applications (revised S1 interface) vRAN (LTE Stack illustration & Accelerator models)
Look aside
Look aside
Inline (offload)
Ola: s1-user plane  raw user plane packet
Two types of look-aside accelerator identified
Added into Section 2.1 as examples;
Clarifications added in Section 4.3.
One types of offload accelerator identified
Added into Section 2.2 as examples;
Clarifications added in Section 4.3.
Back to main discussion

14. IPSec Look Aside Accelerator (to be updated)
IPsec Accelerator HW
SAL
IPSec g-driver
sio-backend (vHost-user)
VNF
App IPsec
App F1
Clear packet
Encrypted packet
Figure X IPsec Packet Processing – Look Aside Accelerator Flow
g-API
Acceleration Core
Virtio-IPsec Look-aside
Frontend
sio + Virtio
hio
s-api
Virtio-net
App F2
Host
kernel
Vhost-net
IPtables FW
OVS DP
VLAN/VxLAN Driver
Physical ports
Suggest to replace this box with a simple “NFVI packet processing box”, like the one used for crypto, IPSec or PME.
To be updated according to the consensus reached based on the previous general figures.
Back to main discussion

15. PDCP Look Aside Accelerator (to be updated)
VNF - PDCP Application
SAL
SAL
SAL
guest
virtio-net frontend
virtio-la-pdcp frontend
virtio-net frontend
To be updated according to the consensus reached based on the previous general figures.
To be aligned with the previous IPSec figure on ingress or outgress part or other processing functions in VNF.
sio
sio
sio
virtio-la-pdcp backend + vHost-user
virtio-net backend
virtio-net backend
SAL
host
SW Accelerator
hio
hio
hio
This view is attempting to how the DPACC layer and configuration can be designed by the developer to give his application the best accelerated performance.
In this picture having a software acceleration layer in the host would provide the best performance and flexibility for a VNF application.
device
HW (NIC)
HW Accelerator (Crypto)
HW (NIC)
Backplane Processing RLC/MAC/PHY
Downlink
Uplink
Backhaul Processing GTPU/IPSec/QoS UE
EPC
Back to main discussion
Packet processing