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| author | Bodong Wang <bodong@mellanox.com> | 2017-04-13 00:51:40 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-04-20 15:53:51 +0200 |
| commit | 0e7df22401a3dfd403b26dea62dd00e0598b538b (patch) | |
| tree | 484063ef8f232bf8d51d998a1331513a9f2c8b5a /Documentation/PCI/pci-iov-howto.txt | |
| parent | PCI: Avoid FLR for Intel 82579 NICs (diff) | |
| download | linux-0e7df22401a3dfd403b26dea62dd00e0598b538b.tar.xz linux-0e7df22401a3dfd403b26dea62dd00e0598b538b.zip | |
PCI: Add sysfs sriov_drivers_autoprobe to control VF driver binding
Sometimes it is not desirable to bind SR-IOV VFs to drivers. This can save
host side resource usage by VF instances that will be assigned to VMs.
Add a new PCI sysfs interface "sriov_drivers_autoprobe" to control that
from the PF. To modify it, echo 0/n/N (disable probe) or 1/y/Y (enable
probe) to:
/sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_drivers_autoprobe
Note that this must be done before enabling VFs. The change will not take
effect if VFs are already enabled. Simply, one can disable VFs by setting
sriov_numvfs to 0, choose whether to probe or not, and then re-enable the
VFs by restoring sriov_numvfs.
[bhelgaas: changelog, ABI doc]
Signed-off-by: Bodong Wang <bodong@mellanox.com>
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'Documentation/PCI/pci-iov-howto.txt')
| -rw-r--r-- | Documentation/PCI/pci-iov-howto.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/PCI/pci-iov-howto.txt b/Documentation/PCI/pci-iov-howto.txt index 2d91ae251982..d2a84151e99c 100644 --- a/Documentation/PCI/pci-iov-howto.txt +++ b/Documentation/PCI/pci-iov-howto.txt @@ -68,6 +68,18 @@ To disable SR-IOV capability: echo 0 > \ /sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_numvfs +To enable auto probing VFs by a compatible driver on the host, run +command below before enabling SR-IOV capabilities. This is the +default behavior. + echo 1 > \ + /sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_drivers_autoprobe + +To disable auto probing VFs by a compatible driver on the host, run +command below before enabling SR-IOV capabilities. Updating this +entry will not affect VFs which are already probed. + echo 0 > \ + /sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_drivers_autoprobe + 3.2 Usage example Following piece of code illustrates the usage of the SR-IOV API. |