Re: Compiling testpmd with DPDK netvsc PMD

[Nandini Rangaswamy <nandini.rangaswamy@broadcom.com>]

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Hi David,
It was a misunderstanding on my part. I had assumed that since the
libraries were not dynamically linked and not showing up in ldd output,
testpmd was probably not using netvsc.
After looking at the comments in config/meson.build " NOTE: DPDK always
builds both shared and static libraries.  Please set "default_library" to
either "static" or "shared" to select default linkage
 for apps and any examples.''')", I inferred that the libraries were being
linked statically.

Following this, i changed the default options in meson.build
default_library=shared from static and added deps in testpmd/meson.build
file as below:

+if dpdk_conf.has('RTE_NET_NETVSC')
+    deps += 'net_netvsc'
+endif
Now ldd dpdk-testpmd  shows netvsc pmd being linked dynamically and also
functional at run time.
Regards,
Nandini

On Mon, Jun 10, 2024 at 12:51 AM David Marchand <david.marchand@redhat.com>
wrote:

> Hello,
>
> On Sat, Jun 8, 2024 at 1:32 AM Nandini Rangaswamy
> <nandini.rangaswamy@broadcom.com> wrote:
> > Thanks for your email. I inspected meson build output and do see that
> netvsc is in the list of enabled drivers.
> > ===============
> > Drivers Enabled
> > ===============
> >
> > common:
> >         iavf, mlx5, qat,
> > bus:
> >         auxiliary, pci, vdev, vmbus,
> > mempool:
> >         bucket, ring, stack,
> > dma:
> >
> > net:
> >         af_packet, bond, e1000, ena, failsafe, gve, i40e, iavf,
> >         ice, igc, ixgbe, kni, mlx5, netvsc, ring, tap,
> >         vdev_netvsc, vhost, virtio, vmxnet3,
>
> Ok, so the driver seems indeed part of this build, yet it was not
> functional at runtime?
> Could you confirm this driver was indeed embeeded in (*statically*
> linked) testpmd?
> $ ./usertools/dpdk-pmdinfo.py build/app/dpdk-testpmd | grep -i vsc
>     "name": "net_netvsc",
>     "name": "net_vdev_netvsc",
>
>
> >
> > Also, i changed the meson.build default_library=shared from static and
> it worked.
>
> Mm, the fact that changing link mode fixes the issue points at a link
> issue.
>
> There is a bug with old pkg-config tool (<= 0.27 iirc) that does not
> process correctly dpdk .pc (for static link).
> It is worth checking which version of pkgconf is used in openwrt.
>
>
> --
> David Marchand
>
>

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