Re: [dpdk-dev] [PATCH] igb_uio: map dummy dma forcing iommu domain attachment

[Thomas Monjalon <thomas.monjalon@6wind.com>]

2017-02-17 12:29, Ferruh Yigit:
> On 1/18/2017 12:27 PM, Alejandro Lucero wrote:
> > For using a DPDK app when iommu is enabled, it requires to
> > add iommu=pt to the kernel command line. But using igb_uio driver
> > makes DMAR errors because the device has not an IOMMU domain.
> > 
> > Since kernel 3.15, iommu=pt requires to use the internal kernel
> > DMA API for attaching the device to the IOMMU 1:1 mapping, aka
> > si_domain. Previous versions did attach the device to that
> > domain when intel iommu notifier was called.
> > 
> > This is not a problem if the driver does later some call to the
> > DMA API because the mapping can be done then. But DPDK apps do
> > not use that DMA API at all.
> > 
> > Doing this dma map and unmap is harmless even when iommu is not
> > enabled at all.
> > 
> > Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
> 
> Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
> 
> (I suggest getting this early in 17.05 release, so it can be tested more)

Sorry, I've missed it in early days of 17.05. Let's add it now.
Ferruh, Alejandro, do not hesitate to ping next time.

Applied, thanks