[dpdk-dev] pci device access from dpdk secondary process with igb_uio

[Trahe, Fiona]

Hi Vijay,

Sorry for the delay, we missed this as It arrived while on Christmas holidays.
We'll investigate, though it may take some time as this looks like a pci lib issue
and up to recently we have only been using QAT in primary processes so don't have
expertise yet in this area.

If you could provide some background to your use-case for qat in primary/secondary, that may help.

Fiona

> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of vijay mohan
> Sent: Thursday, January 2, 2020 6:58 PM
> To: dev at dpdk.org; Yigit, Ferruh <ferruh.yigit at intel.com>; Griffin, John <john.griffin at intel.com>
> Subject: Re: [dpdk-dev] pci device access from dpdk secondary process with igb_uio
> 
> On Thu, 26 Dec 2019 at 16:58, vijay mohan <vijay1054 at gmail.com> wrote:
> >
> > Hi All,
> > I am trying to use pci vf device with secondary process in a multiple process mode and finding
> pci_dev->mem_resource[0].addr to be NULL. This happens when the pci device is attached to
> igb_uio.ko but with vfio_pci it works fine.
> >
> > Looking at the pci device initialization part for secondary process, when device is presented through
> igb_uio, (in pci_uio_map_secondary), it doesn't seems to update pci_dev->mem_resource[X].addr.
> For vfio-pci, it updates the addresses in pci_vfio_map_resource_secondary. With the following patch, i
> am able to use the device from secondary process but would like to know if I am missing something.
> >
> > diff --git a/drivers/bus/pci/pci_common_uio.c b/drivers/bus/pci/pci_common_uio.c
> > index 7ea73db..f4dca9d 100644
> > --- a/drivers/bus/pci/pci_common_uio.c
> > +++ b/drivers/bus/pci/pci_common_uio.c
> > @@ -70,6 +70,7 @@
> >                                 }
> >                                 return -1;
> >                         }
> > +                       dev->mem_resource[i].addr = mapaddr;
> >                 }
> >                 return 0;
> >         }
> 
> Hi Ferruh Yigit/John Griffin,
> I am trying to use QAT crypto VF device attached to igb_uio.ko with
> secondary process and has observed following errors while setting up
> the queues due to pci_dev->mem_resource[0].addr check from
> qat_qp_setup. mem_resource[0].addr happens to be NULL when the device
> is presented to dpdk through igb_uio but works fine with vfio_pci.ko.
> Could you please let me know if the fix mentioned above is sufficient
> for the device to work with secondary process.
> 
> CRYPTODEV: Initialisation parameters - name: BDF_qat_sym,socket id: 0,
> max queue pairs: 0
> qat_sym_dev_create(): Created QAT SYM device BDF_qat_sym as cryptodev instance 0
> qat_comp_dev_create(): Creating QAT COMP device BDF_qat_comp
> qat_comp_dev_create(): Created QAT COMP device BDF_qat_comp as
> compressdev instance 0
> Dev config
> Setting up queues
> qat_qp_setup(): Setup qp 0 on qat pci device 0 gen 2
> qat_qp_setup(): Could not find VF config space (UIO driver attached?).
> Crypto device queue pair init failed
> 
> Thanks,
> Vijay