[dpdk-users] using dpdk as a shared library

[Stephen Hemminger]

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).