[dpdk-dev] [PATCH 0/3] Enable uio_pci_generic support
Bruce Richardson
bruce.richardson at intel.com
Mon Feb 9 15:30:00 CET 2015
On Thu, Jan 29, 2015 at 05:28:16PM +0800, Danny Zhou wrote:
> Linux kernel provides UIO as well as VFIO mechanism to support writing user
> space device driver. Comparing to UIO which is available since 2.6.32 kernel,
> the VFIO is introduced into kernel since version 3.6.0 with better interrupt
> and memory protection (build on top of Intel VT-d technology) supports.
> Basically, UIO and VFIO do two common things below:
> 1) Map PCIe device's I/O memory space to user space driver
> 2) Support device interrupt notification mechanism that notifies user space
> driver/application when a device interrupt triggers.
>
> To run an DPDK application and make use of VFIO, two in_kernel modules
> vfio and vfio-pci module must be loaded. To use UIO, a DPDK kernel
> module igb_uio, which was there since DPDK is invented, must be loaded to
> attach to in_kernel uio module. As an solution to deprecate igb_uio,
> this patch serials leverage the uio_pci_generic in_kernel module to support
> DPDK user space PMD in a generic fashion (similar to how VFIO works), to
> remove user space DPDK dependency on GPL code igb_uio in kernel.
>
> Example to bind Network Ports to uio_pci_generic:
> modprobe uio
> modprobe uio_pci_generic
> /* to bind device 08:00.0, to the uio_pci_generic driver */
> ./tools/dpdk_nic_bind.py -b uio_pci_generic 08:00.0
>
> Note: this patch set does not remove igb_uio support due to igb_uio supports
> creating maximum number of SR-IOV VFs (Virtual Functions) by using max_vfs
> kernel parameter on older kernels (kernel 3.7.x and below).
> Specifically, igb_uio explicitly calls pci_enable_sriov() to create VFs, while
> it is not invoked in either uio or uio_pci_generic kernel modules. On kernel 3.8.x
> and above, user can use the standard sysfs to enable VFs. For examples:
>
> #echo $num_vf_enabled > /sys/class/net/$dev/device/sriov_numvfs //enable VFs
> #echo 0 > /sys/class/net/$dev/device/sriov_numvfs //disable VFs
>
> Danny Zhou (3):
> eal: add interrupt enable/disable routines for uio_pci_generic
> eal: enable uio_pci_generic support
> tools: enable binding NIC device to uio_pci_generic
>
> lib/librte_eal/common/include/rte_pci.h | 1 +
> lib/librte_eal/linuxapp/eal/eal_interrupts.c | 68 +++++--
> lib/librte_eal/linuxapp/eal/eal_pci.c | 2 +-
> lib/librte_eal/linuxapp/eal/eal_pci_uio.c | 202 +++++++++++----------
> .../linuxapp/eal/include/exec-env/rte_interrupts.h | 10 +-
> tools/dpdk_nic_bind.py | 2 +-
> 6 files changed, 172 insertions(+), 113 deletions(-)
>
> --
> 1.8.1.4
>
Series
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
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