> > v3 changes > > - made processing of uio devices identical, irrespective of igb_uio or > > uio_pci_generic > > - removed storage of kernel driver name from dev node as now unneeded. > > > > v2 changes: > > - Change variable name of kernel driver with precise comment > > - Fix a union definition error in v1 patchset > > - Move redefined macro IORESOURCE_MEM to rte_pci.h with comment > > > > 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 > > > > > > Zhou Danny (3): > > eal: enable uio_pci_generic support > > eal: add interrupt enable/disable routines for uio_pci_generic > > tools: enable binding NIC device to uio_pci_generic > > Series Acked-by: Declan Doherty <declan.doherty at intel.com>
Applied, thanks
