[dpdk-dev] [PATCH] pmdinfogen: Fix pmdinfogen to select proper endianess on cross-compile

Neil Horman nhorman at tuxdriver.com
Fri Nov 18 19:47:52 CET 2016

pmdinfogen has a bug in which, during build, it pulls in rte_byteorder.h to
obtain the rte macros for byteswapping between the cpu byte order and big or
little endian.  Unfortunately, pmdinfogen is a tool that is only meant to be run
during the build of dpdk components, and so, it runs on the host.  In cross
compile environments however, the rte_byteorder.h is configured using a target
cpu, who's endianess may differ from that of the host, leading to improper

The fix is to use host system defined byte swapping routines rather than the
dpdk provided routines.  Note that we are using non posix compliant routines, as
the posix compliant api only addresses 16 and 32 bit swaps, and we also need 64
bit swaps.  Those macros exist (via endian.h), but BSD and Linux put that header
in different locations so some ifdeffery is required.

Tested successfully by myself on Linux and BSD systems.

Signed-off-by: Neil Horman <nhorman at tuxdriver.com>
CC: Hemant Agrawal <hemant.agrawal at nxp.com>
CC: Jerin Jacob <Jerin.Jacob at cavium.com>
CC: Bruce Richardson <bruce.richardson at intel.com>
CC: Thomas Monjalon <thomas.monjalon at 6wind.com>
 buildtools/pmdinfogen/pmdinfogen.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/buildtools/pmdinfogen/pmdinfogen.h b/buildtools/pmdinfogen/pmdinfogen.h
index 1da2966..7c787c1 100644
--- a/buildtools/pmdinfogen/pmdinfogen.h
+++ b/buildtools/pmdinfogen/pmdinfogen.h
@@ -16,12 +16,16 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
+#ifdef __linux__ 
+#include <endian.h>
+#include <sys/endian.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <elf.h>
 #include <rte_config.h>
 #include <rte_pci.h>
-#include <rte_byteorder.h>
 /* On BSD-alike OSes elf.h defines these according to host's word size */
 #undef ELF_ST_BIND
@@ -75,9 +79,9 @@
 #define CONVERT_NATIVE(fend, width, x) ({ \
 typeof(x) ___x; \
 if ((fend) == ELFDATA2LSB) \
-	___x = rte_le_to_cpu_##width(x); \
+	___x = le##width##toh(x); \
 else \
-	___x = rte_be_to_cpu_##width(x); \
+	___x = be##width##toh(x); \
 	___x; \

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