On 11/14/2017 07:57 AM, Anmol Panda wrote: > On 14.11.2017 12:07, David Miller wrote: >> From: Anmol Panda <anmol07.visitor@xxxxxxxxxxxxxx> >> Date: Tue, 14 Nov 2017 12:03:23 +0530 >> >>> No bpf syscall, kernel headers too old? >> >> Please enable CONFIG_BPF_SYSCALL in your kernel config. > > Hello David, > > Thank you for your response. We have downloaded the latest stable version of the Linux kernel (4.13.12) and we compiled it with these flags enabled as per the directions here: http://cilium.readthedocs.io/en/stable/bpf/ ; . > > CONFIG_CGROUP_BPF=y > CONFIG_BPF=y > CONFIG_BPF_SYSCALL=y > CONFIG_NET_SCH_INGRESS=m > CONFIG_NET_CLS_BPF=m > CONFIG_NET_CLS_ACT=y > CONFIG_BPF_JIT=y > CONFIG_LWTUNNEL_BPF=y > CONFIG_HAVE_EBPF_JIT=y > CONFIG_BPF_EVENTS=y > CONFIG_TEST_BPF=m > > We also enabled bpf_jit_enable and after the new kernel installation, we verified the setup using the ./test_verifier script int eh tools/testing/selftests/bpf/ folder and the all 506 tests were passed. When we tried the xdp1 program in the sample/tests/ we got the error: > > No bpf syscall, kernel headers too old? > > Is there anything we are missing here? Please guide us. Yes, please make sure that you have a reasonably recent iproute2, if not, just compile it from the git master branch from: https://git.kernel.org/pub/scm/linux/kernel/git/shemminger/iproute2.git/ You kernel headers installed on your machine seem too old, that is why __NR_bpf is not defined and the iproute2 loader throws this error message on bpf syscall. Two options: 1) Install recent kernel headers, for example in your kernel source tree, run: make headers_install INSTALL_HDR_PATH=/usr/ or 2) Apply the iproute2 patch with fallback definitions for the syscall number manually: https://patchwork.ozlabs.org/patch/776015/ and then compile iproute2 again (patch is not in upstream iproute2). Hope that helps, Daniel
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