* [dpdk-dev] Q: uio_generic_pci @ 2018-02-06 10:57 Ran Shalit 2018-02-06 20:56 ` Stephen Hemminger 0 siblings, 1 reply; 2+ messages in thread From: Ran Shalit @ 2018-02-06 10:57 UTC (permalink / raw) To: dev Hello, I would please like to ask about uio_generic_pci : 1. how to set irq from userspace. Is there anything similar to echo "3" > /sys/bus/pci/drivers/uio_pci_generic/irq in all documentation which talk about it, it is not mentioned (or I don't find it): https://github.com/rumpkernel/wiki/wiki/Howto:-Accessing-PCI-devices-from-userspace http://www.hep.by/gnu/kernel/uio-howto/uio_pci_generic.html 2. Is there a way to use dma from userspace with this driver ? Best Regards, Ran ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [dpdk-dev] Q: uio_generic_pci 2018-02-06 10:57 [dpdk-dev] Q: uio_generic_pci Ran Shalit @ 2018-02-06 20:56 ` Stephen Hemminger 0 siblings, 0 replies; 2+ messages in thread From: Stephen Hemminger @ 2018-02-06 20:56 UTC (permalink / raw) To: Ran Shalit; +Cc: dev On Tue, 6 Feb 2018 12:57:15 +0200 Ran Shalit <ranshalit@gmail.com> wrote: > Hello, > > I would please like to ask about uio_generic_pci : > > 1. how to set irq from userspace. No. that is not generally possible. It is expected that the IRQ will come from the hardware device. On some hardware it is possible to poke a register and cause an interrupt. > Is there anything similar to > echo "3" > /sys/bus/pci/drivers/uio_pci_generic/irq > in all documentation which talk about it, it is not mentioned (or I > don't find it): > https://github.com/rumpkernel/wiki/wiki/Howto:-Accessing-PCI-devices-from-userspace > http://www.hep.by/gnu/kernel/uio-howto/uio_pci_generic.html > > 2. Is there a way to use dma from userspace with this driver ? This driver does not provide mappings of the PCI memory regions so DMA is not possible. Use VFIO-pci or igb_uio instead. ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2018-02-06 20:56 UTC | newest] Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-02-06 10:57 [dpdk-dev] Q: uio_generic_pci Ran Shalit 2018-02-06 20:56 ` Stephen Hemminger
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