[dpdk-users] using dpdk as a shared library

[Justin Tallon]

Hey Stephen,

Thanks for the response, I have passed the directory of the dpdk library as
you said with the -d flag.

However, when I did this, I get the following error.

libdpdk.so: invalid ELF header

any help with this would be appreciated.

Regards,
Justin

____
Justin Tallon Ph.D.

Software Radio Systems (SRS)
http://www.softwareradiosystems.com

+353-86-067-0753 | justin.tallon at softwareradiosystems.com


On Sat, Dec 19, 2020 at 8:27 PM Stephen Hemminger <
stephen at networkplumber.org> wrote:

> On Fri, 18 Dec 2020 23:38:28 +0100
> Justin Tallon <justin.tallon at softwareradiosystems.com> wrote:
>
> > Hey guys,
> >
> > We are trying to use dpdk (dpdk-stable-18.08.1) as a shared library.
> >
> > We have recompiled as a shared library by setting
> > *CONFIG_RTE_BUILD_SHARED_LIB=y*
> >
> > My program compiles file and I can see the relevant libraries when I use
> > ldd on the binary.
> >
> > I direct my binary look in the correct place by using export
> > LD_LIBRARY_PATH and the binary appears to find the libraries.
> > However, when the function rte_eth_dev_count_avail returns it returns a 0
> > and exits, when I run the same program with static libraries, it works
> > correctly.
> >
> > Any help on this would be great!
> >
> > Regards,
> > Justin
> >
> >
> > ____
> > Justin Tallon Ph.D.
> >
> > Software Radio Systems (SRS)
> > http://www.softwareradiosystems.com
> >
> > +353-86-067-0753 | justin.tallon at softwareradiosystems.com
>
> When used as a shared library DPDK does not automatically load any
> required poll
> mode driver libraries. You have to pass -d flag to make it load what you
> want.
>
> I consider this a bug (others do not), and think the DPDK should have a
> table
> mapping PCI device id to the PMD shared library and automatically load the
> PMD
> shared library (like the Linux kernel module autoloading works).
>
>