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

[Harold Demure <harold.demure87@gmail.com>]

Dear Olga and Vincent,
  thank you for your reply.
It seems that the problem has now gone away; both with the -j and without
the -j flag. I will try to backtrace the root cause of the problem and
report it if I manage to isolate it.

If I may, I would also like to ask your help for a related problem, which I
have reported also on the mellanox community forum. If you are available,
you may find my question there [1].

I take the occasion to specifically address Olga Shern because I saw that
she has already given support on a related topic [2].
Also, related to [2] but possibly un-related from the questions in [1], I
am failing to attach a "Perfect Match" filter to my mlx4 NIC, via

rte_eth_dev_filter_ctrl(port_id, RTE_ETH_FILTER_FDIR,
RTE_ETH_FILTER_ADD, &filter)

Is this an expected behavior, namely, mlx4 does not support (yet) this kind
of operational mode?

Thank you (and anybody willing to help) for your time.
Best regards,
  Harold Demure


[1] https://community.mellanox.com/thread/3152
[2] http://dpdk.org/ml/archives/dev/2015-April/016392.html

2016-02-15 9:59 GMT+01:00 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
> >
>