Re: DPDK with Mellanox ConnectX-5, complaining about mlx5_eth?

[Thomas Monjalon <thomas@monjalon.net>]

13/11/2024 22:43, CJ Sculti:
> I'm not using vfio, I just bound interfaces on there one time to test.
> Shouldn't I be able to just use the default mlx5_core driver, without
> binding to uio_pci_generic?

Yes you must not bind to anything else than mlx5 kernel driver.
Please try to follow the documentation and tell us what you find.


> On Wed, Nov 13, 2024 at 4:26 PM Thomas Monjalon <thomas@monjalon.net> wrote:
> 
> > 13/11/2024 21:10, CJ Sculti:
> > > I've been running my application for years on igb_uio with Intel NICs. I
> > > recently replaced them with a Mellanox ConnectX-5 2x 40gbps NIC, updated
> > > the DPDK version my application uses, and compiled with support for mlx5
> > > PMDs. Both 40Gbps ports are up with link, and both are in Ethernet mode,
> > > not Infiniband mode. However, I'm getting complaints when I start my
> > > application about trying to load 'mlx5_eth'? Both are bound to mlx5_core
> > > driver at the moment. When I bind them to vfio-pci, or uio_pci_generic,
> > my
> > > application fails to recognize them at all as valid DPDK devices. Anyone
> > > have any ideas? Also, strange that it only complains about one? I have
> > them
> > > configured in a bond on the kernel, as my application requires that.
> >
> > You must not bind mlx5 devices with VFIO.
> > I recommend reading documentation.
> > You can start here:
> > https://doc.dpdk.org/guides/linux_gsg/linux_drivers.html#bifurcated-driver
> > then
> > https://doc.dpdk.org/guides/platform/mlx5.html#design