On Sun, 12 Nov 2017 14:27:25 +0530 Anmol Panda <anmol07.visitor@xxxxxxxxxxxxxx> wrote: > Dear all, > We are trying to write a program that receives a packet from a > client and is supposed to return the packet to the source. We tried to > swap the source and dest and send it using the XDP_TX action. But it > doesn't work. > > We have compiled a new kernel and bound the NIC to xdp successfully. > After binding, the system stops responding to ping and other packet > generating scripts (like sendip). We are using kernel 4.13.12 (Ubuntu > 17.10) from the main linux kernel tree and binding with Intel I217-LM > NIC. This NIC is using e1000e driver. Can xdp / eBPF be used for this > NIC? Moreover, do we need to patch the driver for additional support? Not all drivers have "native' XDP support. See slide 11 of [1] [1] http://people.netfilter.org/hawk/presentations/driving-IT2017/driving-IT-2017_XDP_eBPF_technology_Jesper_Brouer.pdf There is something called "Generic" XDP (v4.12) for ease of development. It allow you to attach an XDP program any net_device. I call it --skb-mode in my sample programs. See [2] [2] https://prototype-kernel.readthedocs.io/en/latest/blogposts/xdp25_eval_generic_xdp_tx.html > Our aim is to benchmark various forwarding applications (L2 , L3, > etc.) run using xdp. Please point to some code samples to achieve this. > We will be truly grateful. Kernel have directory: samples/bpf/ I maintain some more example programs here: https://github.com/netoptimizer/prototype-kernel/tree/master/kernel/samples/bpf Do notice that e1000e is only 1Gbit/s (which is very slow). The normal Linux kernel can handle 1Gbit/s without any issues... I hope you are planning to use something faster, else it does not make sense to use XDP. -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
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