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git clone  https://github.com/Netronome/bpf-samples.git
cd programmable_rss/
make clean && make
cd ../libbpf/src/ && make clean;
make[1]: Entering directory '/opt/bpf-samples/libbpf/src'
rm -f *.o *.a *.so
make[1]: Leaving directory '/opt/bpf-samples/libbpf/src'
rm -f rss
rm -f rss_kern.o
rm -f rss_user.o
rm -f *.ll
make[1]: Entering directory '/opt/bpf-samples/libbpf/src'
cc -I. -I../include -I../include/uapi -DCOMPAT_NEED_REALLOCARRAY -g -O2 -Werror -Wall -c bpf.c -o bpf.o
cc -I. -I../include -I../include/uapi -DCOMPAT_NEED_REALLOCARRAY -g -O2 -Werror -Wall -c btf.c -o btf.o
cc -I. -I../include -I../include/uapi -DCOMPAT_NEED_REALLOCARRAY -g -O2 -Werror -Wall -c libbpf.c -o libbpf.o
cc -I. -I../include -I../include/uapi -DCOMPAT_NEED_REALLOCARRAY -g -O2 -Werror -Wall -c libbpf_errno.c -o libbpf_errno.o
cc -I. -I../include -I../include/uapi -DCOMPAT_NEED_REALLOCARRAY -g -O2 -Werror -Wall -c netlink.c -o netlink.o
cc -I. -I../include -I../include/uapi -DCOMPAT_NEED_REALLOCARRAY -g -O2 -Werror -Wall -c nlattr.c -o nlattr.o
cc -I. -I../include -I../include/uapi -DCOMPAT_NEED_REALLOCARRAY -g -O2 -Werror -Wall -c str_error.c -o str_error.o
cc -I. -I../include -I../include/uapi -DCOMPAT_NEED_REALLOCARRAY -g -O2 -Werror -Wall -c libbpf_probes.c -o libbpf_probes.o
ar rcs libbpf.a bpf.o btf.o libbpf.o libbpf_errno.o netlink.o nlattr.o str_error.o libbpf_probes.o
make[1]: Leaving directory '/opt/bpf-samples/libbpf/src'
make[1]: Entering directory '/opt/bpf-samples/libbpf/src'
if [ ! -d 'root/usr/include/bpf' ]; then install -d -m 755 'root/usr/include/bpf'; fi; install bpf.h libbpf.h btf.h -m 644 'root/usr/include/bpf'
make[1]: Leaving directory '/opt/bpf-samples/libbpf/src'
cc -I../libbpf/src//root/usr/include/ -I../headers/ -L../libbpf/src/ -o rss rss_user.c -lbpf -lelf
clang -S \
    -D __BPF_TRACING__ \
    -I../libbpf/src//root/usr/include/ -I../headers/ \
    -Wall \
    -Wno-unused-value -Wno-pointer-sign \
    -Wno-compare-distinct-pointer-types \
    -Werror \
    -O2 -emit-llvm -c -g rss_kern.c
llc -march=bpf -filetype=obj -o rss_kern.o rss_kern.ll
llc: rss_kern.ll:2:1: error: expected top-level entity
source_filename = "rss_kern.c"
^
Makefile:56: recipe for target 'rss_kern.o' failed
make: *** [rss_kern.o] Error 1

test_hashmap(unsigned int task, void *data)
  38 {
  39         long long key, next_key, first_key, value;
  40         int fd;
  41
  42         fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(key), sizeof(value),
  43                             2, map_flags);
  44         if (fd < 0) {
  45                 printf("Failed to create hashmap '%s'!\n", strerror(errno));
  46                 exit(1);
  47         }
  48
  49         key = 128;
  50         value = 1234;
  51         /* Insert key=1 element. */
  52         printf("insert key 128 and value 1234\n");
  53         assert(bpf_map_update_elem(fd, &key, &value, BPF_ANY) == 0);
  54         printf("no assert\n");