Hi Damjan,
Thanks for the reply
Here are the details:
1. We want to use only the rte_mempool infrastructure for lockless global
memory pools. We will not be using any mbuf infrastructure from dpdk
2. We want to use this infra across our multiple plugins
3. We want to be able to include rte_mempool data structures from our multiple
header files (.h files )
4. We want to be able to make calls to rte_mempool apis from our source code (
.c files )
-----Original Message-----
From: Damjan Marion <dmar...@me.com>
Sent: Monday, October 25, 2021 5:22 AM
To: bjerem...@gmail.com
Cc: vpp-dev@lists.fd.io
Subject: Re: [vpp-dev] Linking DPDK libs to plugins
> On 25.10.2021., at 01:13, bjerem...@gmail.com wrote:
>
> Greetings,
>
> Let me preface this by saying that I really do not know much about the CMake
> utility. But I am trying to see if there is a way to make the DPDK libs
> accessible to other plugins (aside from the dpdk plugin) that are in their
> own project/subdirectory similar. I am working with v20.05 currently
> (although we are upgrading to 21.06 if that make a difference).
>
> Initially it was suggested to me that I could just add a couple lines
> to my CMakeLists to link the dpdk_plugin.so to my own plugin.. but I
> have not been able to get this to work.. It never seems to recognize
> the path to the .so, even if I give the absolute path
>
> set(DPDK_PLUGIN_LINK_FLAGS "${DPDK_PLUGIN_LINK_FLAGS} -L <dir to vpp
> plugins> -ldpdk_plugin.so")
>
> add_vpp_plugin(my_plugin
> ….
> LINK_FLAGS
> “${ DPDK_PLUGIN_LINK_FLAGS }”
>
> Another approach suggested was to maybe use dlsym to dynamically load
> symbols… Anyway, I was thinking that someone has to have had done this
> before, or maybe have more of a clue as to how to do this then I currently do.
>
Please note that VPP is not DPDK application, DPDK is just optional device
driver layer for us.
Even if you manage to get your plugin linked against DPDK libs, there is no
guarantee that you will be able to use all dpdk data structures. Most obvious
example, rte_mbuf structure for a packet buffer may not be populated for you.
Also use of DPDK comes with a performance cost, we need to copy buffer metadata
left and right on both RX and TX side.
What specific DPDK library you would like to use? We may have alternative
proposal….
—
Damjan
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