From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Monjalon Subject: Re: [PATCH v3 0/3] enable uio_pci_generic support Date: Fri, 20 Feb 2015 23:35:35 +0100 Message-ID: <2756218.dzv8LREliS@xps13> References: <1424365731-32228-1-git-send-email-danny.zhou@intel.com> <1424451557-27419-1-git-send-email-bruce.richardson@intel.com> <54E77270.102@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Cc: dev-VfR2kkLFssw@public.gmane.org To: Bruce Richardson , danny.zhou-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org Return-path: In-Reply-To: <54E77270.102-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org Sender: "dev" > > 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 Applied, thanks