> On 4 Jul 2019, at 23:56, Jonathan Richardson via Lists.Fd.Io
> <[email protected]> wrote:
>
> 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
You are likely not compiling dpdk with fPIC, and you need to do so, as final
result will be linked into
dpdk_plugin.so, which is shared library.
>
> 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")
Because we are statically linking and we want all dpdk symbols to be linked
into dpdk_plugin.so.
Otherwise constructor functions will not be linked in.
>
> 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
--
Damjan
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