From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Subject: Re: Cannot use MLX4 with igb_uio driver
Date: Mon, 9 Jan 2017 16:13:53 +0100
Message-ID: <20170109151353.GZ12822@6wind.com>
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To: Royce Niu <royceniu@gmail.com>
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Hi Royce,

On Mon, Jan 09, 2017 at 10:53:37PM +0800, Royce Niu wrote:
> Dear all,
> 
> I cannot use my Mellanox 3 Pro, after I binded it with igb_uio driver.
> 
> It always shows when I use my DPDK application.
> 
> EAL: Detected 32 lcore(s)
> EAL: Probing VFIO support...
> PMD: bnxt_rte_pmd_init() called for (null)
> EAL: PCI device 0000:02:00.0 on NUMA socket 0
> EAL:   probe driver: 8086:1521 rte_igb_pmd
> EAL: PCI device 0000:02:00.1 on NUMA socket 0
> EAL:   probe driver: 8086:1521 rte_igb_pmd
> EAL: PCI device 0000:02:00.2 on NUMA socket 0
> EAL:   probe driver: 8086:1521 rte_igb_pmd
> EAL: PCI device 0000:02:00.3 on NUMA socket 0
> EAL:   probe driver: 8086:1521 rte_igb_pmd
> EAL: PCI device 0000:81:00.0 on NUMA socket 1
> EAL:   probe driver: 15b3:1007 librte_pmd_mlx4
> PMD: librte_pmd_mlx4: cannot access device, is mlx4_ib loaded?
> EAL: Error - exiting with code: 1
>   Cause: Cannot create mbuf pool
> 
> ---------------
> I have added CONFIG_RTE_LIBRTE_MLX4_PMD=y in .config, and
> install MLNX_OFED_LINUX-3.4-2.0.0.0.

The mlx4 PMD does not operate through igb_uio (see mlx4 documentation [1]),
PCI devices must remain bound to their original kernel module (mlx4_core),
however you have to additionally load mlx4_ib, mlx4_en and ib_uverbs [2].

[1] http://dpdk.org/doc/guides/nics/mlx4.html
[2] http://dpdk.org/doc/guides/nics/mlx4.html#prerequisites

-- 
Adrien Mazarguil
6WIND