[dpdk-users] DPDK 20.11 MLX5 testpmd tx_pp 'WQE index ignore feature is required for packet pacing'

[Thomas Monjalon]

11/12/2020 17:19, Slava Ovsiienko:
> From: Thomas Monjalon <thomas at monjalon.net>
> > 09/12/2020 17:03, Alessandro Pagani:
> > > Hi all,
> > >
> > > I am trying to run dpdk testpmd with Mellanox ConnectX4 Lx (mlx5 driver).
> > >
> > > I am specifying the tx_pp parameter to provide the packet send
> > > scheduling on mbuf timestamps, but the testpmd fails with the following
> > error:
> > [...]
> > > EAL: Probe PCI driver: mlx5_pci (15b3:1015) device: 0000:3b:00.0
> 
> This is ConnectX-4LX (DevID is 1015), it does not support scheduling.
> Tx scheduling is supported since ConnectX-6DX. 
> 
> > > (socket 0)
> > > mlx5_pci: No available register for Sampler.
> > > mlx5_pci: WQE index ignore feature is required for packet pacing
> > > mlx5_pci: probe of PCI device 0000:3b:00.0 aborted after encountering
> > > an
> > > error: No such device
> > > common_mlx5: Failed to load driver = mlx5_pci.
> > >
> > > EAL: Requested device 0000:3b:00.0 cannot be used
> > [...]
> > > The error messages suggest that "WQE index ignore feature is required
> > > for packet pacing".
> > >
> > > Anyone knows the reason of this error and how to solve it?
> > 
> > I think it means your device does not support this feature.
> > But I realize it is not documented here:
> 
> Yes, indeed. I'll provide the patch, thank you for noticing that.

I think we should also improve the error message to
something like "not supported on this device".