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From: Stephen Hemminger <stephen@networkplumber.org>
To: Justin Tallon <justin.tallon@softwareradiosystems.com>
Cc: users@dpdk.org
Subject: Re: [dpdk-users] using dpdk as a shared library
Date: Sat, 19 Dec 2020 11:27:15 -0800
Message-ID: <20201219112715.75924abe@hermes.local> (raw)
In-Reply-To: <CA+uMv7fETKjRBodqnfXUXWae5+keCRBKWA3JE6TteA7SGQO_vw@mail.gmail.com>

On Fri, 18 Dec 2020 23:38:28 +0100
Justin Tallon <justin.tallon@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@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).


  reply	other threads:[~2020-12-19 19:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-18 22:38 Justin Tallon
2020-12-19 19:27 ` Stephen Hemminger [this message]
2020-12-21 23:20   ` Justin Tallon
2020-12-21 23:32     ` Stephen Hemminger
2021-03-22 21:18       ` Justin Tallon

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