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

Matushevsky, Alexander matua at amazon.com
Sat Jan 30 17:39:21 CET 2016

Hello Thomas,​
Regarding the documentation, we are going to add a description in doc/guides/nics in updated patch early on the upcoming week.

The full device spec still undergoes internal review, and will be released as soon as we have the approvals.

Best regards,
From: Thomas Monjalon <thomas.monjalon at 6wind.com>
Sent: Friday, January 29, 2016 6:04 PM
To: Jan Mędala
Cc: Matushevsky, Alexander; dev at dpdk.org
Subject: Re: [dpdk-dev] [PATCH 0/4] DPDK polling-mode driver for Amazon Elastic Network Adapters (ENA)

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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