[dpdk-dev] [PATCH 0/4] DPDK polling-mode driver for Amazon Elastic Network Adapters (ENA)

Thomas Monjalon thomas.monjalon at 6wind.com
Fri Jan 29 17:04:38 CET 2016

2016-01-29 16:42, Jan Mędala:
> Hello Thomas,
> 2016-01-28 16:40 GMT+01:00 Thomas Monjalon <thomas.monjalon at 6wind.com>:
> > >  lib/librte_eal/linuxapp/ena_uio/ena_uio_driver.c   |  276 +++
> >
> > Sorry the kernel module party is over.
> > One day, igb_uio will be removed.
> > I suggest to make a first version without interrupt support
> > and work with Linux community to fix your issues.
> Rationale to deliver UIO kernel module is based on lack of legacy INTx
> interrupts in ENA device. It's operating only on MSI-X.
> Currently we do not implement interrupt support (yet) in PMD, but hardware
> was unable to operate under uio_generic_pci driver - probe is failing.
> It might be possible to use igb_uio kmod with ENA and I will do necessary
> investigation+experiments to prove that.
> Could you elaborate on the topic of kernel module removal - how would it
> look like, is there going to be generic PCI driver dedicated for MSI-X
> devices?

VFIO is the driver which should cover every needs for userspace drivers
requiring a generic kernel module. Another approach is used for mlx devices.
Thanks for checking how to improve your driver.

My other question was about documentation. I don't know your device.
Please any info or pointer?

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