On Tue, Jan 26, 2021 at 10:57:27AM +0200, Leon Romanovsky wrote: > From: Leon Romanovsky <leonro@xxxxxxxxxx> > > Extend PCI sysfs interface with a new callback that allows configure > the number of MSI-X vectors for specific SR-IO VF. This is needed > to optimize the performance of newly bound devices by allocating > the number of vectors based on the administrator knowledge of targeted VM. > > This function is applicable for SR-IOV VF because such devices allocate > their MSI-X table before they will run on the VMs and HW can't guess the > right number of vectors, so the HW allocates them statically and equally. > > 1) The newly added /sys/bus/pci/devices/.../vfs_overlay/sriov_vf_msix_count > file will be seen for the VFs and it is writable as long as a driver is not > bounded to the VF. > > The values accepted are: > * > 0 - this will be number reported by the VF's MSI-X capability > * < 0 - not valid > * = 0 - will reset to the device default value > > 2) In order to make management easy, provide new read-only sysfs file that > returns a total number of possible to configure MSI-X vectors. > > cat /sys/bus/pci/devices/.../vfs_overlay/sriov_vf_total_msix > = 0 - feature is not supported > > 0 - total number of MSI-X vectors to consume by the VFs > > Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx> > --- > Documentation/ABI/testing/sysfs-bus-pci | 32 +++++ > drivers/pci/iov.c | 180 ++++++++++++++++++++++++ > drivers/pci/msi.c | 47 +++++++ > drivers/pci/pci.h | 4 + > include/linux/pci.h | 10 ++ > 5 files changed, 273 insertions(+) Bjorn, Can I please get your Acked-by on this so it will go through mlx5-next -> netdev submission flow? Thanks
