26/03/2019 10:21, Christian Ehrhardt:
> > >
> > > rdma-core configures modprobe for ib/rdma modules, installs some
> > > helper daemons and installs some udev rules. It certainly makes
> > > administration of the server an easier task, but it isn't *required*
> > > when configuring a Debian server for rdma and user-space ibverbs.
> >
> > I didn't think it is required for mlx5 as the ethernet driver
> > autoloads the rdma modules itself..
>
> Below is the log that I got from Mellanox (thanks Alaa and Thomas.
> To me the messages related to ib_uverbs seem interesting.
>
> @Jason - this is triggered by DPDK. In regard to the autoloading - did
> you refer to DPDKs net_mlx5 or the kernels net_mlx5 in e.g.
> mlx5_core.ko?
> I only found [1] which does not seem right, can you point at the
> autoloading feature (a commit maybe) that you meant (keep in mind this
> is DPDK 17.11.5)?
> [1]: https://doc.dpdk.org/guides/nics/mlx5.html#compilation-options
There is no autoloading of kernel drivers when using DPDK.
> @Allaa/Thomas - due to the messages in the log, could you try if
> instead of installing rdma-core just doing the modprobe would be
> enough to resolve the problem?
> $ modprobe ib_uverbs # instead of the apt install
Yes, manual modprobe partially replaces rdma-core packages.
These are the files we identified as required from the rdma-core packages:
/etc/modprobe.d/mlx4.conf
/etc/rdma/modules/rdma.conf
/lib/udev/rules.d/90-rdma-hw-modules.rules
/lib/systemd/system/rdma-hw.target
The first file (mlx4.conf) is a template helping to get the right config
by commenting out a line.
The others files are for autoloading of the kernel drivers.
I think you should include the rdma-core package when using DPDK.
It can be a dependency of the DPDK package, or a dependency of libibverbs.
Does it make sense to install libibverbs without rdma-core configuration?
