Hello,
I'm having trouble compiling the dpdk plugin using vpp 19.01.1 and dpdk
18.01. I'm using
yocto with glibc 2.27. It fails to link in the glibc functions that
libdpdk uses:
/home/jonathar/work/yocto/poky/build/tmp/work/aarch64-poky-linux/vpp/19.01
.1-r0/recipe-sysroot-native/usr/bin/aarch64-poky-linux/../../libexec/aarch
64-poky-linux/gcc/aarch64-poky-linux/7.3.0/ld:
/home/jonathar/work/yocto/poky/build/tmp/work/aarch64-poky-linux/vpp/19.01
.1-r0/recipe-sysroot/usr/lib64/librte_bus_dpaa.a(of.o): relocation
R_AARCH64_ADR_PREL_PG_HI21 against symbol `versionsort@@GLIBC_2.17' which
may bind externally can not be used when making a shared object; recompile
with -fPIC
I'm wondering why the link option whole-archive is being used to pull
in all symbols instead of letting the linker resolve what's needed and
link statically:
set(DPDK_LINK_FLAGS "-L${DPDK_LIB_DIR}
-Wl,--whole-archive,${DPDK_LIB},--no-whole-archive")
libdpdk is a GROUP so it should let the linker resolve the required
symbols. I changed the line to:
set(DPDK_LINK_FLAGS "-Wl,-Bstatic -L${DPDK_LIB_DIR} -Wl,-ldpdk
-Wl,-Bdynamic")
But when loading dpdk plugin at runtime it says it can't find the symbol
below:
load_one_plugin:145: /usr/lib64/vpp_plugins/dpdk_plugin.so: undefined
symbol: rte_pktmbuf_init
load_one_plugin:146: Failed to load plugin 'dpdk_plugin.so'
Is this due to the way the plugin is loaded? I'll try changing dpdk to
dynamic linking.
If I do readelf -a on the plugin I see:
Relocation section '.rela.dyn' at offset 0x4448 contains 369 entries:
Offset Info Type Sym. Value Sym. Name +
Addend
00000004cde0 003100000401 R_AARCH64_GLOB_DA 0000000000000000
rte_pktmbuf_init + 0
The decoding of unwind sections for machine type AArch64 is not currently
supported.
Symbol table '.dynsym' contains 341 entries:
Num: Value Size Type Bind Vis Ndx Name
49: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND
rte_pktmbuf_init
Symbol table '.symtab' contains 882 entries:
Num: Value Size Type Bind Vis Ndx Name
606: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND
rte_pktmbuf_init
Thanks,
Jon
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