On Mon, Nov 5, 2012 at 1:20 PM, Donald Dutile <ddutile@xxxxxxxxxx> wrote: > Currently, VF enablement by SRIOV-capable PCIe devices is done > in driver-specific module parameters. If not setup in modprobe files, > it requires admin to unload & reload PF drivers with number of desired > VFs to enable. Additionally, the enablement is system wide: all > devices controlled by the same driver have the same number of VFs > enabled. Although the latter is probably desired, there are PCI > configurations setup by system BIOS that may not enable that to occur. > > Two files are created if a PCIe device has SRIOV support: > sriov_totalvfs -- cat-ing this file returns the maximum number > of VFs a PCIe device supports. > sriov_numvfs -- echo'ing a positive number to this file enables > & configures this number of VFs for this given PCIe > device. > -- echo'ing 0 to this file disables and deconfigures > all VFs for this given PCIe device. > -- cat-ing this file will return the number of VFs > currently enabled on this PCIe device. > > VF enable and disablement is invoked much like other PCIe > configuration functions -- via a registered callback in the driver, > i.e., probe, release, etc. In this case, sriov_configure > > PATCH v1->v2: > -- incorporate more feedback from Ben Hutchings. > -- (hopefully) correct From & Signed-by for Yinghai Lu's patches (1/8 & 2/8) > > RFC V3->PATCH: > -- incorporate feedback from Ben Hutchings. > -- clean up poor RFC patches & sanitize through checkpatch.pl > > RFC v2->v3: > -- change the file names to reflect the names used in the SRIOV spec > -- change to a single file for enable & disable; > change driver interface to a single interface. > -- add more informative messages on failures > -- add a core method that a driver can invoke to modify > the totalvfs reported & supported by a driver. > -- a set of patches for ixgbe provided by Greg Rose to use the > new interfaces; the last patch modified from the original > two file, enable/disable interface to the current single file > enable/disable. Greg will eventually post the final version > of these patches via Intel's usual process for driver patches. > Provided here as an example, and enable other SRIOV drivers > to see how adoption of the interface can be added. > > RFC v1->v2: > This patch is based on previous 2 patches by Yinghai Lu > that cleaned up the vga attributes for PCI devices under sysfs, > and uses visibility-checking group attributes as recommended by > Greg K-H. > > Signed-off-by: Donald Dutile <ddutile@xxxxxxxxxx> > --- > drivers/pci/iov.c | 48 ++++++++++++++++ > drivers/pci/pci-sysfs.c | 179 ++++++++++++++++++++++++++++++++++++++++++++++++++++++---- > drivers/pci/pci.h | 2 + > drivers/pci/probe.c | 1 + > include/linux/pci.h | 11 ++++ > 5 files changed, 230 insertions(+), 11 deletions(-) I applied patches 1-4 to my pci/don-sriov patch, and they appeared in next-20121114. I am still expecting a Documentation/ABI update, but I wanted to get the functional patches merged now because there will only be one more -next release until 11/26, which will probably be after -rc7. I'm expecting patches 5-8 to be posted via some other mechanism as mentioned in those patches. Thanks! Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
