From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: BUG: DPDK i40e does not work with VFIO
Date: Fri, 6 Nov 2015 09:26:08 -0800
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To: Helin Zhang <helin.zhang@intel.com>, <dev@dpdk.org>, Jesse Brandeburg
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On Thu, 5 Nov 2015 09:19:25 -0800
Stephen Hemminger <shemming@brocade.com> wrote:

> On my machine, i40e will not startup if using VFIO.
> 
> PMD: rte_i40evf_pmd_init():  >>
> PMD: rte_i40e_pmd_init():  >>
> PMD: eth_i40e_dev_init():  >>
> PMD: i40e_set_symmetric_hash_enable_per_port(): Symmetric hash has already been disabled
> PMD: eth_i40e_dev_init(): Failed to init adminq: -54
> 
> The normal Linux driver works correctly. Firmware has been updated to the latest version.
> 
> Like my earlier experience with fm10k, I suspect that Intel never tests i40e with IOMMU,
> and only tested with igb_uio.

I found the issue. It was a problem with older version of Xen DOM0 patches
which were still outstanding in the internal development package.