On Sun, Feb 04, 2024 at 02:12:57PM +0800, Emily Deng wrote:
> When a vf has been reset, the pf wants to get notification to remove the vf
> out of schedule.
It is very questionable if this is right thing to do. The idea of SR-IOV
is that VFs represent a physical device and they should be treated
separately from the PF.
In addition to that Keith said, this patch needs better justification.
Thanks
>
> Solution:
> Add the callback function in pci_driver sriov_vf_reset_notification. When
> vf reset happens, then call this callback function.
>
> Signed-off-by: Emily Deng <Emily.Deng@xxxxxxx>
> ---
> drivers/pci/pci.c | 8 ++++++++
> include/linux/pci.h | 1 +
> 2 files changed, 9 insertions(+)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 60230da957e0..aca937b05531 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -4780,6 +4780,14 @@ EXPORT_SYMBOL_GPL(pcie_flr);
> */
> int pcie_reset_flr(struct pci_dev *dev, bool probe)
> {
> + struct pci_dev *pf_dev;
> +
> + if (dev->is_virtfn) {
> + pf_dev = dev->physfn;
> + if (pf_dev->driver->sriov_vf_reset_notification)
> + pf_dev->driver->sriov_vf_reset_notification(pf_dev, dev);
> + }
> +
> if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
> return -ENOTTY;
>
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index c69a2cc1f412..4fa31d9b0aa7 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -926,6 +926,7 @@ struct pci_driver {
> int (*sriov_configure)(struct pci_dev *dev, int num_vfs); /* On PF */
> int (*sriov_set_msix_vec_count)(struct pci_dev *vf, int msix_vec_count); /* On PF */
> u32 (*sriov_get_vf_total_msix)(struct pci_dev *pf);
> + void (*sriov_vf_reset_notification)(struct pci_dev *pf, struct pci_dev *vf);
> const struct pci_error_handlers *err_handler;
> const struct attribute_group **groups;
> const struct attribute_group **dev_groups;
> --
> 2.36.1
>
>
