Re: [dpdk-users] DPDK 2.2 MLX4: problem with number of TX/RX queues

[Olga Shern <olgas@mellanox.com>]

Hi Harold, 

DPDK 2.2 with MLNX_OFED that you are using and ConnectX-3 support RSS automatically.
You don’t need to configure anything.

Looks there is some bug in the compilation, did you compile  with make -j, we saw some issue with it.
Can you please try without -j flag.

Best Regards,
Olga

-----Original Message-----
From: users [mailto:users-bounces@dpdk.org] On Behalf Of Harold Demure
Sent: Thursday, February 11, 2016 11:37 PM
To: Vincent Li
Cc: users@dpdk.org
Subject: Re: [dpdk-users] DPDK 2.2 MLX4: problem with number of TX/RX queues

Hello Vincent,
  Thank you for your reply. I followed the same reasoning as you did, looking at the source code earlier today.

Can you send me a link that explains how to change RX for my NIC?
I have been looking around for that, and also performed the steps in the DPDK official guide for MLX4, but apparently nothing changed (at least, the error was still there).

In addition, I have to describe a new strange behavior: even *without changing anything rss-wise*, but just enabling the increased debugging verbosity (CONFIG_RTE_LIBRTE_MLX4_DEBUG=y), the error I had suddenly disappeared.

I cannot really explain what happened. Can anybody?

At this point (with the debug prints), now my code blocks because apparently mlx4 does not support FlowDir, so I have to change a bit my software, which is built to use it.

Still, I would love to know what's going on with my rx/tx queues.

Thank you.
Regards,
   Harold

2016-02-11 20:10 GMT+01:00 Vincent Li <vincent.mc.li@gmail.com>:

> On Thu, Feb 11, 2016 at 6:24 AM, Non Voglio 
> <harold.demure87@gmail.com>
> wrote:
> > Hello,
> >   I am new to the DPDK world and I am having some troubles in using 
> > some code (not written by me).
> >
> > In particular, I bump into this error when invoking the
> rte_eth_dev_configure
> > function:
> >
> > PMD: librte_pmd_mlx4: 0x10a4d2a0: TX queues number update: 0 -> 16
> >
> > PMD: librte_pmd_mlx4: 0x10a4d2a0: RX queues number update: 0 -> 16
> >
> > PMD: librte_pmd_mlx4: 0x10a4d2a0: only a single RX queue can be
> configured
> > when hardware doesn't support RSS
> >
>
> it appears you must enable RSS support to use multiple RX queue
>
>         if (!priv->hw_rss) {
>                 ERROR("%p: only a single RX queue can be configured when"
>                       " hardware doesn't support RSS",
>                       (void *)dev);
>                 return EINVAL;
>         }
>
> Vincent
>