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

[Slava Ovsiienko]

> -----Original Message-----
> From: Thomas Monjalon <tho...@monjalon.net>
> Sent: Friday, December 11, 2020 17:48
> To: Alessandro Pagani <alessandropagani...@gmail.com>
> Cc: users@dpdk.org; Slava Ovsiienko <viachesl...@nvidia.com>; Asaf Penso
> <as...@nvidia.com>
> Subject: Re: [dpdk-users] DPDK 20.11 MLX5 testpmd tx_pp 'WQE index ignore
> feature is required for packet pacing'
> 
> 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.

With best regards, Slava


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