From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Markuze <alex-I7wstvAgZDk@public.gmane.org>
Subject: Re: ixgbe network card has dev_info.max_rx_queues == 0
Date: Thu, 21 Aug 2014 15:52:49 +0300
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To: Sergey Mironov <grrwlf-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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RX and TX Are short hand for Receive and Transmit Queues.
These Queues Store the in/egress packets.

Just looking at the info you've sent it tells you that max_rx_queues
for this dev is 0 (Clearly something is wrong here) so the nb_rx_q
which is 3 is an Invalid Value -EINVAL == -22.

On Thu, Aug 21, 2014 at 3:26 PM, Sergey Mironov <grrwlf-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Hi. I have face a strange error on one of my network cards. Call to
> rte_eth_dev_configure returns with error code -22. Increaing the
> verbosity level shows the following:
>
>
> PMD: rte_eth_dev_configure: ethdev port_id=2 nb_rx_queues=3 > 0
> EAL: Error - exiting with code: 1
>
> here is the snippet of code which returns the error
>
>
> ./lib/librte_ether/rte_ethdev.c : 513
>
>     (*dev->dev_ops->dev_infos_get)(dev, &dev_info);
>     if (nb_rx_q > dev_info.max_rx_queues) {
>         PMD_DEBUG_TRACE("ethdev port_id=%d nb_rx_queues=%d > %d\n",
>                 port_id, nb_rx_q, dev_info.max_rx_queues);
>         return (-EINVAL);
>     }
>
> What does this error means (what is rx queues of an adapter?) What may
> cause such a problem? I am using dpdk 1.5.1r1.
>
> Thanks in advance,
> Sergey