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Cambium cnPilot 190W: New life for old hardware, improving reliability & performance with OpenWrt, fq_codel & cake
by Ignacio Ocampo 16 Oct '23

16 Oct '23

Hi there, I'm new on this distribution list. But wanted to share this article I post about improving the reliability and performance of old hardware with new software. It has to do with Linux Kernel, FQ_Codel and Cake, and building an OpenWrt image. https://blog.nafiux.com/posts/cnpilot_r190w_openwrt_bufferbloat_fqcodel_cak… -- Ignacio Ocampo

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0x17: Bronze sponsor, Relianoid
by Jamal Hadi Salim 14 Oct '23

14 Oct '23

We welcome first time sponsor associated with long time supporters, RELIANOID, as a bronze sponsor. Welcome and thank you RELIANOID! RELIANOID simplifies the complexity of site reliability through load balancing at layer 4 and layer 7, high availability, and security with WAF, DDoS protection and much more! RELIANOID solutions are based on an open core and built by a team with years' of experience working on load balancing project developments such as netfilter based load balancer core nftlb. For more information: https://www.relianoid.com/ cheers, jamal

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0x17: Security Workshop
by Jamal Hadi Salim 12 Oct '23

12 Oct '23

Steffen Klassert will chair the security workshop. Agenda topics include: Quantum-Proofing Data: The Power Of Post-Quantum Cryptography (https://netdevconf.info/0x17/17) and Multi-core IPsec tunnels (https://netdevconf.info/0x17/56) cheers, jamal

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0x17: Virtualization related talks
by Jamal Hadi Salim 12 Oct '23

12 Oct '23

We have two talks on virtualization @0x17. In the first talk Yahui Cao, Phani R Burra, Anjali Singhai and Sridhar samudrala discuss VM live migration using IDPF. They discuss some of the implementation choices that are made in the IDPF driver to help make Live migration support generic enough for all vendors that plan to support IDPF easy to implement. Details at: https://netdevconf.info/0x17/30 In the second talk, Yui Washizu describes how to do offloading for containers inside VMs while using VFs - a tricky proposition considering existing solutions like the SR-IOV CNI plug-in creates and configures Virtual Functions (VFs) by accessing Physical Functions (PFs). Yui Washizu will show the details of our approach, the performance numbers of the PoC and plans for future switchdev mode. Details at: https://netdevconf.info/0x17/20 cheers, jamal

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0x17: Talk, netdev development stats and process changes
by Jamal Hadi Salim 11 Oct '23

11 Oct '23

Apologies for the earlier automated email. Here's a better one ;-> Netdev Maintainer Jakub Kicinski will take a look back at the last year of development in netdev through the lens of development statistics and process changes. He will share his thoughts on upcoming challenges an how to overcome them. cheers, jamal

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0x17: Talk, netdev development stats and process changes Speakers Jakub Kicinski Label Nuts and Bolts Session Type Talk Description Look back at the last year of development in netdev through the lens of development statistics and process changes. Discussion on challenges ahead.
by Jamal Hadi Salim 11 Oct '23

11 Oct '23

Netdev Maintainer Jakub Kicinski will take a look back at the last year of development in netdev through the lens of development statistics and process changes. He will share his thoughts on upcoming challenges an how to overcome them. cheers, jamal

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TCP Offload via AF_XDP sockets– Not your grandmother’s TCP Offload!
by Jamal Hadi Salim 08 Oct '23

08 Oct '23

Tom Herbert says the key to doing TOE is to offload TCP connection processing and TCP state machine from a host CPU to a SmartNIC CPU running Linux. This is not your grandma's TCP offload anymore! AF_XDP sockets are used to provide a generic and extensible offload messaging interface. Tom takes a different approach than[1]. He believes the solution is to run a TCP “proxy” running in the SmartNIC CPU. In this talk Tom will cover the overall design, the messaging API used over AF_XDP sockets, the client library, the TCP “proxy” running in the SmartNIC CPU, and example application code. The full lifetime of an offloaded connection is described including connection setup and tear down, data operations, flow control over the messaging interface. He'll further discuss the hardware requirements. [1]https://netdevconf.info/0x17/sessions/talk/kernel-offload-with-complete-host-kernel-functionalities.html cheers, jamal

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0x17: Talk, Netlink APIs to Expose/Configure Netdev Objects
by Jamal Hadi Salim 08 Oct '23

08 Oct '23

Work to reduce the amount of developer involvement in netlink coding has been widely successful[1]. To name a few existing consumers of this new approach: devlink, ethtool, DPLL, FOU, XDP, TLS handshake[2], etc. You essentially define your netlink messaging and attributes in YAML and a compiler outputs not only all the commodity code (parsing, validating, etc) that you would have had to write (and make mistakes in) but also documentation(as you all know: developers like to write documentation. Not)! In this talk, Amritha Nambiar and Sridhar Samudrala extend the netlink definition of netdev-genl to add support for additional netdev objects: queue and NAPI. Queues are exposed as netlink objects, enabling visibility to per queue attributes (example, NAPI instance servicing the queue, stats, memory model etc.). NAPI instances are used to expose attributes such as the NAPI id, NAPI device, interrupt number associated with the NAPI instance and PID of the NAPI thread. Amritha and Sridhar say their work opens a lot of opportunities for interesting use cases. Example, the new netlink communication could be used to create queues etc. for multiple usecases (RSS context handling, Rx zerocopy, XDP); adjusting the NAPI thread priorities and SMP affinity. Additionally, with this features in place, one could also configure NAPI pollers to queues from the userspace. This could be used to limit the number of NAPI instances by configuring a poller to be shared among queues that are on an interrupt vector, etc. In this talk, they will discuss the design and how it interacts with the driver subsystem; they will further discuss challenges faced and their solutions as well as future work. Come and engage them in the discussion! [1]https://docs.kernel.org/userspace-api/netlink/specs.html [2]https://netdevconf.info/0x17/sessions/bof/tls-handshake-for-in-kernel-consumers.html cheers, jamal

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0x17: Talk, kernel offload with complete host kernel functionalities
by Jamal Hadi Salim 08 Oct '23

08 Oct '23

Offloading relieves the host resources to be used for application work. Traditional offloading has been focussed mostly with either plumbing features (TSO, checksum, etc) or limited L4 (TC offloads, etc). Offloading of TCP machinery -famously called TOE- for example has been frowned upon for many reasons[1]. Ryo Nakamura and Hajime Tazaki feel they could address these outstanding issues transparently. The application on the host has no idea that the rest of the stack is outsourced somewhere else... How, you ask? On the host side they intercept system calls made by the application and transparently route them to a syscall proxy sitting on an xPU. The syscall proxy, which is a lightweight user space program, interfaces on the northbound to the host and on its southbound to Linux Kernel Library(LKL)[2]. LKL is optimized to improve packet processing code paths. Our esteemed speakers have implemented this feature using the Nvidia Bluefield DPU. In this talk they will present the design of the offload and discuss results of various workload performance tests: 1) a typical TCP transmission flow with existing offloading feature (TSO/LRO, checksum), 2) avoiding data copying between host and NIC with sendfile syscalls, and 3) kTLS offload with sendfile syscall (but not optimized as no hardware crypto offloading) over existing implementations (nginx and openssl). Last, but not least, they will briefly discuss the opportunities for the future improvements, including further offload (crypto, larger segmentation size for TCP, our RDMA channel implementation, and a choice of passthrough method, etc). [1]https://wiki.linuxfoundation.org/networking/toe [2]https://lkl.github.io/ cheers, jamal

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0x17: Talk, Nanotube: Turning XDP Code into Custom Hardware Pipelines for FPGA SmartNICs
by Jamal Hadi Salim 08 Oct '23

08 Oct '23

Many modern NICs have built-in packet processing capabilities that can effectively perform the type of use case that XDP is often used for. Stephan Diestelhorst, Neil Turton, Kieran Mansley, Kimon Karras, Rip Sohan , Thomas Calvert and Steven Pope say that being able to seamlessly offload this XDP code to the NIC – under the control of the Linux networking subsystem and tooling – would increase server efficiency and performance without affecting the user experience. Stephan Diestelhorst et al will discuss Nanotube: an open-source compiler that consumes standard XDP code and produces a tailor-made, application-specific dataflow pipeline suitable for execution on FPGA NIC platforms. They have demonstrated generated Katran on AMD/Xilinx FPGA-based NICs to offload with throughput at line rate (100 Gbps) on AMD NICs! In this talk they will describe (i) the structure of the compiler; (ii) performance of typical workloads; and (iii) how map accesses by host software are supported using specially annotated packets over the normal host data path. And last but not least they will discuss requirements to allow better integration and support by the Linux kernel, in particular the validator, map handling, and vendor-neutral support requirements. cheers, jamal

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