netdev - Re: [PATCH net] samples/bpf: fix a build issue

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Date:   Mon, 10 Jul 2017 20:21:28 +0000
From:   Lawrence Brakmo <brakmo@...com>
To:     Yonghong Song <yhs@...com>, Alexei Starovoitov <ast@...com>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Kernel Team <Kernel-team@...com>,
        Yonghong Song <yhs@...alhost.localdomain>
Subject: Re: [PATCH net] samples/bpf: fix a build issue

Thank you for fixing it.

On 7/10/17, 1:12 PM, "Yonghong Song" <yhs@...com> wrote:

    From: Yonghong Song <yhs@...alhost.localdomain>
    
    With latest net-next:
    ====
    clang  -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/6.3.1/include -I./arch/x86/include -I./arch/x86/include/generated/uapi -I./arch/x86/include/generated  -I./include -I./arch/x86/include/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h  -Isamples/bpf \
    	-D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \
    	-Wno-compare-distinct-pointer-types \
    	-Wno-gnu-variable-sized-type-not-at-end \
    	-Wno-address-of-packed-member -Wno-tautological-compare \
    	-Wno-unknown-warning-option \
    	-O2 -emit-llvm -c samples/bpf/tcp_synrto_kern.c -o -| llc -march=bpf -filetype=obj -o samples/bpf/tcp_synrto_kern.o
    samples/bpf/tcp_synrto_kern.c:20:10: fatal error: 'bpf_endian.h' file not found
             ^~~~~~~~~~~~~~
    1 error generated.
    ====
    
    net has the same issue.
    
    Add support for ntohl and htonl in tools/testing/selftests/bpf/bpf_endian.h
    and move it to samples/bpf/ directory so that it can used by
    both selftests/bpf and samples/bpf. The existing samples/bpf/bpf_helpers.h
    is already used by both.
    
    Signed-off-by: Yonghong Song yhs@...com

Acked-by: Lawrence Brakmo <brakmo@...com>

    ---
     {tools/testing/selftests => samples}/bpf/bpf_endian.h | 14 ++++++++++++++
     tools/testing/selftests/bpf/Makefile                  |  3 ++-
     2 files changed, 16 insertions(+), 1 deletion(-)
     rename {tools/testing/selftests => samples}/bpf/bpf_endian.h (73%)
    
    diff --git a/tools/testing/selftests/bpf/bpf_endian.h b/samples/bpf/bpf_endian.h
    similarity index 73%
    rename from tools/testing/selftests/bpf/bpf_endian.h
    rename to samples/bpf/bpf_endian.h
    index 487cbfb..74af266 100644
    --- a/tools/testing/selftests/bpf/bpf_endian.h
    +++ b/samples/bpf/bpf_endian.h
    @@ -23,11 +23,19 @@
     # define __bpf_htons(x)			__builtin_bswap16(x)
     # define __bpf_constant_ntohs(x)	___constant_swab16(x)
     # define __bpf_constant_htons(x)	___constant_swab16(x)
    +# define __bpf_ntohl(x)			__builtin_bswap32(x)
    +# define __bpf_htonl(x)			__builtin_bswap32(x)
    +# define __bpf_constant_ntohl(x)	___constant_swab32(x)
    +# define __bpf_constant_htonl(x)	___constant_swab32(x)
     #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
     # define __bpf_ntohs(x)			(x)
     # define __bpf_htons(x)			(x)
     # define __bpf_constant_ntohs(x)	(x)
     # define __bpf_constant_htons(x)	(x)
    +# define __bpf_ntohl(x)			(x)
    +# define __bpf_htonl(x)			(x)
    +# define __bpf_constant_ntohl(x)	(x)
    +# define __bpf_constant_htonl(x)	(x)
     #else
     # error "Fix your compiler's __BYTE_ORDER__?!"
     #endif
    @@ -38,5 +46,11 @@
     #define bpf_ntohs(x)				\
     	(__builtin_constant_p(x) ?		\
     	 __bpf_constant_ntohs(x) : __bpf_ntohs(x))
    +#define bpf_htonl(x)				\
    +	(__builtin_constant_p(x) ?		\
    +	 __bpf_constant_htonl(x) : __bpf_htonl(x))
    +#define bpf_ntohl(x)				\
    +	(__builtin_constant_p(x) ?		\
    +	 __bpf_constant_ntohl(x) : __bpf_ntohl(x))
     
     #endif /* __BPF_ENDIAN__ */
    diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
    index 2ca51a8..f263c6b 100644
    --- a/tools/testing/selftests/bpf/Makefile
    +++ b/tools/testing/selftests/bpf/Makefile
    @@ -8,7 +8,8 @@ ifneq ($(wildcard $(GENHDR)),)
       GENFLAGS := -DHAVE_GENHDR
     endif
     
    -CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include
    +CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include \
    +	-I../../../../samples/bpf
     LDLIBS += -lcap -lelf
     
     TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
    -- 
    2.9.4