[PATCH v4 3/5] bpf: add a test for BPF ELF load

[Marat Khalili]

P.S. When running with UB sanitizer:

RTE>>bpf_elf_load_autotest
BPF: resolve_xsym(40): EBPF_PSEUDO_CALL to external function: dummy_func1
../../src/lib/bpf/bpf_validate.c:247:24: runtime error: signed integer overflow: 9223372036854775807 + 2147483647 cannot be represented in type 'long int'
    #0 0x2b1fdca in eval_add ../../src/lib/bpf/bpf_validate.c:247
    #1 0x2b2b9dc in eval_alu ../../src/lib/bpf/bpf_validate.c:691
    #2 0x2b3b187 in evaluate ../../src/lib/bpf/bpf_validate.c:2446
    #3 0x2b3bf0f in __rte_bpf_validate ../../src/lib/bpf/bpf_validate.c:2537
    #4 0x2b19b33 in rte_bpf_load ../../src/lib/bpf/bpf_load.c:113
    #5 0x2b47d6d in bpf_load_elf ../../src/lib/bpf/bpf_load_elf.c:288
    #6 0x2b47fe8 in rte_bpf_elf_load ../../src/lib/bpf/bpf_load_elf.c:320
    #7 0x66b4b8 in test_bpf_elf_load ../../src/app/test/test_bpf.c:3382