[dpdk-dev] building shared library

Newman Poborsky newman555p at gmail.com
Mon Nov 10 15:22:40 CET 2014


is it possible to build a  dpdk app as a shared library?

I tried to put 'include $(RTE_SDK)/mk/rte.extshared.mk' in my Makefile (and
define SHARED) and it builds .so lib, but all rte_* symbols are undefined.

After that i tried adding:
LDLIBS += -lrte_eal -lrte_mbuf -lrte_cmdline -lrte_timer  -lrte_mempool
-lrte_ring  -lrte_pmd_ring -lethdev -lrte_malloc

And now almost all symbols in .so file are defined (missing only

I thought this was gonna be it. But after using this library, pci probe-ing
fails since I don't have any pmd drivers registered, and
rte_eth_dev_count() returns 0.

But how are drivers supposed to be registered?

When I use gdb with regular dpdk app (not shared library), I can see this:
#0  0x000000000046fab0 in rte_eal_driver_register ()
#1  0x0000000000418fb7 in devinitfn_bond_drv ()
#2  0x00000000004f15ed in __libc_csu_init ()
#3  0x00007ffff6efee55 in __libc_start_main (main=0x41ee65 <main>, argc=1,
argv=0x7fffffffe4f8, init=0x4f15a0 <__libc_csu_init>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffe4e8) at
#4  0x000000000041953c in _start ()

Ok, if I'm not mistaken, it seems driver registration is called before
main. How is this accomplished? Cause in shared library build, I don't have
this before main() and after rte_eal_init() (since driver list is empty)
everything else fails.

Any suggestions please? I'd really appreciate it...

Newman P.

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