I have just tried running the test case again, in a freshly-installed Ubuntu 22.10 VM. I have checked out the 'latest' xdp-project/xdp-tools and run 'make install' for libbpf and libxdp. This time I get a trace which ends with + export LD_LIBRARY_PATH=/usr/local/lib + LD_LIBRARY_PATH=/usr/local/lib + ns2_pid=6487 + sleep 20 + ./af_xdp_user -S -d vpeer2 -Q 1 --filename ./af_xdp_kern.o main cfg.filename=./af_xdp_kern.o main Opening program file ./af_xdp_kern.o libxdp: Couldn't find xdp program in bpf object main xdp_prog=0xfffffffffffffffe What am I doing wrong? Chris Ward, IBM On Thu, 24 Nov 2022 at 10:25, Chris Ward <tjcw01@xxxxxxxxx> wrote: > > I am writing a bpf/xdp example which I hope to put in > xdp-project/bpf-examples when it is done. But I am finding that I get > an unexpected ENOTSOCK return code from a bpf_map_update_elem function > call. My test case is here > https://github.com/tjcw/bpf-examples/tree/tjcw-integration-0.3/AF_XDP-filter > ; see its README.md for what it does. > > I have a matching test case here > https://github.com/tjcw/xdp-tutorial/tree/master/ebpf-filter which > works normally. > > The problem may be a diffent libbpf level; the AF_XDP_filter version > of the test case is running with libbpf set up by "git submodule > update --init", where the ebpf-filter version has libbpf set up by the > 'bleeding edge' libbpf being checked out at ~tjcw/workspace. I will > try again with more careful version control. > > The last few lines written by the test case are > libbpf: elf: skipping unrecognized data section(7) xdp_metadata > libbpf: elf: skipping unrecognized data section(7) xdp_metadata > xsk_socket__create_shared_named_prog returns 0 > bpf_map_update_elem(9,0x7ffcaea02670,0x7ffcaea02674,0) > bpf_map_update_elem returns -88 > ERROR: Cannot set up socket 0 > ERROR: Can't setup AF_XDP sockets "Socket operation on non-socket" > > the full log of the test case is available here > https://github.com/libbpf/libbpf/issues/630 > > Thanks for any light you can throw on the issue ! > > Chris Ward, IBM
