Re: Compiling testpmd with DPDK netvsc PMD

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

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Hi David,
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,

Also, i changed the meson.build default_library=shared from static and it
worked.
Regards,
Nandini

On Fri, Jun 7, 2024 at 3:56 AM David Marchand <david.marchand@redhat.com>
wrote:

> Hello,
>
> On Thu, Jun 6, 2024 at 11:32 PM Nandini Rangaswamy
> <nandini.rangaswamy@broadcom.com> wrote:
> > I tried compiling the testpmd with DPDK netvsc for openwrt by setting
> CONFIG_RTE_LIBRTE_NETVSC_PMD=y .
> >
> > However, when I check ldd testpmd, it does not show any of the dpdk
> shared libraries including net_netvsc linked to testpmd binary.
> > ldd dpdk-testpmd
> >         linux-vdso.so.1 (0x00007ffca1467000)
> >         libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ffb08134000)
> >         libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2
> (0x00007ffb0812f000)
> >         libelf.so.1 => /usr/lib/x86_64-linux-gnu/libelf.so.1
> (0x00007ffb08111000)
> >         libpcap.so.1 => not found
> >         libmlx5.so.1 => /usr/lib/x86_64-linux-gnu/libmlx5.so.1
> (0x00007ffb08093000)
> >         libibverbs.so.1 => /usr/lib/x86_64-linux-gnu/libibverbs.so.1
> (0x00007ffb0806d000)
> >         libIPSec_MB.so.1 => not found
> >         libcrypto.so.3 => /usr/lib/x86_64-linux-gnu/libcrypto.so.3
> (0x00007ffb07c29000)
> >         libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
> (0x00007ffb07c09000)
> >         libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
> (0x00007ffb07c04000)
> >         libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ffb079db000)
> >         /lib64/ld-linux-x86-64.so.2 (0x00007ffb097c1000)
> >         libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ffb079bd000)
> >         libnl-route-3.so.200 =>
> /usr/lib/x86_64-linux-gnu/libnl-route-3.so.200 (0x00007ffb0793a000)
> >         libnl-3.so.200 => /lib/x86_64-linux-gnu/libnl-3.so.200
> (0x00007ffb07917000)
>
> I am not sure what openwrt does wrt DPDK compilation, yet I can give some
> hints.
>
> DPDK drivers are, by default, statically linked into dpdk binaries
> like testpmd, so netvsc would not show up in this listing you tried.
> On the other hand, if using dynamically linked drivers, testpmd is not
> linked to them. Instead, those shared libraries are found
> automatically (for a DPDK global install) or via the -d EAL option.
> Then EAL loads those drivers via dlopen().
>
> If you want to ensure that a specific driver is linked in, you may
> inspect meson output (which lists enabled drivers), or have a try with
> dpdk-pmd-info.py /path/to/dpdk-testpmd.
>
> HTH,
>
> --
> David Marchand
>
>

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