Re: [dpdk-dev] [PATCH v7 3/9] linuxapp/eal_pci: get iommu class

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

> From: Santosh Shukla [mailto:santosh.shukla@caviumnetworks.com]
> Sent: Thursday, August 31, 2017 4:26 AM
> To: dev@dpdk.org
> Cc: thomas@monjalon.net; jerin.jacob@caviumnetworks.com;
> hemant.agrawal@nxp.com; olivier.matz@6wind.com;
> maxime.coquelin@redhat.com; Gonzalez Monroy, Sergio
> <sergio.gonzalez.monroy@intel.com>; Richardson, Bruce
> <bruce.richardson@intel.com>; shreyansh.jain@nxp.com;
> gaetan.rivet@6wind.com; Burakov, Anatoly <anatoly.burakov@intel.com>;
> stephen@networkplumber.org; aconole@redhat.com; Santosh Shukla
> <santosh.shukla@caviumnetworks.com>
> Subject: [PATCH v7 3/9] linuxapp/eal_pci: get iommu class
> 
> Get iommu class of PCI device on the bus and returns preferred iova
> mapping mode for that bus.
> 
> Patch also introduces RTE_PCI_DRV_IOVA_AS_VA drv flag.
> Flag used when driver needs to operate in iova=va mode.
> 
> Algorithm for iova scheme selection for PCI bus:
> 0. If no device bound then return with RTE_IOVA_DC mapping mode, else
> goto 1).
> 1. Look for device attached to vfio kdrv and has .drv_flag set to
> RTE_PCI_DRV_IOVA_AS_VA.
> 2. Look for any device attached to UIO class of driver.
> 3. Check for vfio-noiommu mode enabled.
> 
> If 2) & 3) is false and 1) is true then select mapping scheme as RTE_IOVA_VA.
> Otherwise use default mapping scheme (RTE_IOVA_PA).
> 
> Signed-off-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>
> Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
> ---

Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>