[dpdk-dev] Cannot use MLX4 with igb_uio driver

Adrien Mazarguil adrien.mazarguil at 6wind.com
Mon Jan 9 17:13:26 CET 2017


On Mon, Jan 09, 2017 at 11:23:56PM +0800, Royce Niu wrote:
> Hi, Adrien,
> 
> Actually, I tested using the original kernel module without binding. It
> works.
> 
> However, it is only 6Mpps for 64B in pkt-gen, which is so slow for a 40Gbps
> NIC.
> 
> Is that right?

That's difficult to say without knowing your specific setup or application,
however 6 Mpps seems abnormally slow assuming testpmd performing basic I/O
forwarding using a single thread and two ports.

> On Mon, Jan 9, 2017 at 11:13 PM, Adrien Mazarguil <
> adrien.mazarguil at 6wind.com> wrote:
> 
> > 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
> >
> 
> 
> 
> -- 
> Regards,
> 
> Royce

-- 
Adrien Mazarguil
6WIND


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