Calico-eBPF-Dataplane-CNCF-Webinar-Slides.pdf

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yingxinwang4

introduce calico networking

Internet

Calico Networking
with eBPF
Shaun Crampton, Core Developer for Project Calico
Chris Hoge, Developer Advocate for Project Calico

What prompted the team
to add another dataplane
to Calico?

(extended) Berkeley Packet Filter
● An in-kernel virtual machine that “gives super-powers to
Linux”
● Allows you to attach mini-programs to low-level hooks in
the kernel
● Programs veriﬁed to ensure they are “safe”
○ e.g. can’t crash the system, access invalid memory addresses, will
terminate
● Programs can only interact with the rest of the kernel
through helper functions (there’s a limit to super powers!)
● The clang compiler can be used to build eBPF programs
or you can write them directly in byte-code

What sort of things can you
do with eBPF?

eBPF Features and Uses
● Security!
○ A seccomp ﬁlter mode allows users to write a program to determine
if a system call is allowed.
● Logging and Tracing!
○ Gather information directly from the kernel about what calls are
being run and how much time is being spent in them.
● Network Routing and Packet Filtering!
○ It’s right there in the name. There are many different networking
hooks - with varying performance and richness in capabilities.

How did you ﬁgure out
what to build?
What was your design and
development process?

How is this diﬀerent from
the current
implementation?

What improvements does
eBPF bring to Calico?

Pod-to-pod throughput and CPU
40 Gbps network, running qperf in single pod

Native handling of Services: First packet latency

Native handling of Services: More eﬃcient updates

Native handling of Services: Direct Server Return
Kube-proxy packet path Calico eBPF

Native handling of Services: Direct Server Return
40 Gbps network, 1k services

How to try it out!
● This is a tech preview, which means it’s not ready for
production… yet!
● https://docs.projectcalico.org/getting-started/kubernetes/trying-ebpf

Thank you!
Questions? https:/
/projectcalico.org
https:/
/slack.projectcalico.org
@projectcalico
https:/
/github.com/projectcalico/community
https:/
/discuss.projectcalico.org

References
● Introducing the Calico eBPF Dataplane (projectcalico)
● A Thorough Introduction to eBPF (lwn)
● A seccomp overview (lwn)
● eBPF Tracing Tools

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1. Calico Networking with eBPF Shaun Crampton, Core Developer for Project Calico Chris Hoge, Developer Advocate for Project Calico

2. What prompted the team to add another dataplane to Calico?

3. Calico’s Pluggable Dataplane

4. What is eBPF?

5. (extended) Berkeley Packet Filter ● An in-kernel virtual machine that “gives super-powers to Linux” ● Allows you to attach mini-programs to low-level hooks in the kernel ● Programs veriﬁed to ensure they are “safe” ○ e.g. can’t crash the system, access invalid memory addresses, will terminate ● Programs can only interact with the rest of the kernel through helper functions (there’s a limit to super powers!) ● The clang compiler can be used to build eBPF programs or you can write them directly in byte-code

6. What sort of things can you do with eBPF?

7. eBPF Features and Uses ● Security! ○ A seccomp ﬁlter mode allows users to write a program to determine if a system call is allowed. ● Logging and Tracing! ○ Gather information directly from the kernel about what calls are being run and how much time is being spent in them. ● Network Routing and Packet Filtering! ○ It’s right there in the name. There are many different networking hooks - with varying performance and richness in capabilities.

8. How did you ﬁgure out what to build? What was your design and development process?

9. How is this diﬀerent from the current implementation?

10. What improvements does eBPF bring to Calico?

11. Pod-to-pod throughput and CPU 40 Gbps network, running qperf in single pod

12. Native handling of Services: First packet latency

13. Native handling of Services: More eﬃcient updates

14. Native handling of Services: Direct Server Return Kube-proxy packet path Calico eBPF

15. Native handling of Services: Direct Server Return 40 Gbps network, 1k services

16. How can I try it out?

17. How to try it out! ● This is a tech preview, which means it’s not ready for production… yet! ● https://docs.projectcalico.org/getting-started/kubernetes/trying-ebpf

18. What’s next?

19. Thank you! Questions? https:/ /projectcalico.org https:/ /slack.projectcalico.org @projectcalico https:/ /github.com/projectcalico/community https:/ /discuss.projectcalico.org

20. References ● Introducing the Calico eBPF Dataplane (projectcalico) ● A Thorough Introduction to eBPF (lwn) ● A seccomp overview (lwn) ● eBPF Tracing Tools

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