linux-kernel - Re: [RFC PATCH v4 08/10] i40e/vf_migration: VF live migration

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Date:   Thu, 11 Jun 2020 19:10:48 -0400
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     Xiang Zheng <zhengxiang9@...wei.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        alex.williamson@...hat.com, cohuck@...hat.com,
        zhenyuw@...ux.intel.com, zhi.a.wang@...el.com,
        kevin.tian@...el.com, shaopeng.he@...el.com, yi.l.liu@...el.com,
        xin.zeng@...el.com, hang.yuan@...el.com,
        Wang Haibin <wanghaibin.wang@...wei.com>
Subject: Re: [RFC PATCH v4 08/10] i40e/vf_migration: VF live migration -
 pass-through VF first

On Thu, Jun 11, 2020 at 10:27:34AM +0800, Xiang Zheng wrote:
> 
> 
> On 2020/6/11 8:23, Yan Zhao wrote:
> > On Wed, Jun 10, 2020 at 04:59:43PM +0800, Xiang Zheng wrote:
> >> Hi Yan,
> >>
> >> few nits below...
> >>
> >> On 2020/5/18 10:53, Yan Zhao wrote:
> >>> This driver intercepts all device operations as long as it's probed
> >>> successfully by vfio-pci driver.
> >>>
> >>> It will process regions and irqs of its interest and then forward
> >>> operations to default handlers exported from vfio pci if it wishes to.
> >>>
> >>> In this patch, this driver does nothing but pass through VFs to guest
> >>> by calling to exported handlers from driver vfio-pci.
> >>>
> >>> Cc: Shaopeng He <shaopeng.he@...el.com>
> >>>
> >>> Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
> >>> ---
> >>>  drivers/net/ethernet/intel/Kconfig            |  10 ++
> >>>  drivers/net/ethernet/intel/i40e/Makefile      |   2 +
> >>>  .../ethernet/intel/i40e/i40e_vf_migration.c   | 165 ++++++++++++++++++
> >>>  .../ethernet/intel/i40e/i40e_vf_migration.h   |  59 +++++++
> >>>  4 files changed, 236 insertions(+)
> >>>  create mode 100644 drivers/net/ethernet/intel/i40e/i40e_vf_migration.c
> >>>  create mode 100644 drivers/net/ethernet/intel/i40e/i40e_vf_migration.h
> >>>
> >>> diff --git a/drivers/net/ethernet/intel/Kconfig b/drivers/net/ethernet/intel/Kconfig
> >>> index ad34e4335df2..31780d9a59f1 100644
> >>> --- a/drivers/net/ethernet/intel/Kconfig
> >>> +++ b/drivers/net/ethernet/intel/Kconfig
> >>> @@ -264,6 +264,16 @@ config I40E_DCB
> >>>  
> >>>  	  If unsure, say N.
> >>>  
> 
> [...]
> 
> >>> diff --git a/drivers/net/ethernet/intel/i40e/i40e_vf_migration.h b/drivers/net/ethernet/intel/i40e/i40e_vf_migration.h
> >>> new file mode 100644
> >>> index 000000000000..696d40601ec3
> >>> --- /dev/null
> >>> +++ b/drivers/net/ethernet/intel/i40e/i40e_vf_migration.h
> >>> @@ -0,0 +1,59 @@
> >>> +/* SPDX-License-Identifier: GPL-2.0 */
> >>> +/* Copyright(c) 2013 - 2019 Intel Corporation. */
> >>> +
> >>> +#ifndef I40E_MIG_H
> >>> +#define I40E_MIG_H
> >>> +
> >>> +#include <linux/pci.h>
> >>> +#include <linux/vfio.h>
> >>> +#include <linux/mdev.h>
> >>> +
> >>> +#include "i40e.h"
> >>> +#include "i40e_txrx.h"
> >>> +
> >>> +/* helper macros copied from vfio-pci */
> >>> +#define VFIO_PCI_OFFSET_SHIFT   40
> >>> +#define VFIO_PCI_OFFSET_TO_INDEX(off)   ((off) >> VFIO_PCI_OFFSET_SHIFT)
> >>> +#define VFIO_PCI_INDEX_TO_OFFSET(index)	((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
> >>> +#define VFIO_PCI_OFFSET_MASK    (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
> >>> +
> >>> +/* Single Root I/O Virtualization */
> >>> +struct pci_sriov {
> >>> +	int		pos;		/* Capability position */
> >>> +	int		nres;		/* Number of resources */
> >>> +	u32		cap;		/* SR-IOV Capabilities */
> >>> +	u16		ctrl;		/* SR-IOV Control */
> >>> +	u16		total_VFs;	/* Total VFs associated with the PF */
> >>> +	u16		initial_VFs;	/* Initial VFs associated with the PF */
> >>> +	u16		num_VFs;	/* Number of VFs available */
> >>> +	u16		offset;		/* First VF Routing ID offset */
> >>> +	u16		stride;		/* Following VF stride */
> >>> +	u16		vf_device;	/* VF device ID */
> >>> +	u32		pgsz;		/* Page size for BAR alignment */
> >>> +	u8		link;		/* Function Dependency Link */
> >>> +	u8		max_VF_buses;	/* Max buses consumed by VFs */
> >>> +	u16		driver_max_VFs;	/* Max num VFs driver supports */
> >>> +	struct pci_dev	*dev;		/* Lowest numbered PF */
> >>> +	struct pci_dev	*self;		/* This PF */
> >>> +	u32		cfg_size;	/* VF config space size */
> >>> +	u32		class;		/* VF device */
> >>> +	u8		hdr_type;	/* VF header type */
> >>> +	u16		subsystem_vendor; /* VF subsystem vendor */
> >>> +	u16		subsystem_device; /* VF subsystem device */                                                                                   
> >>> +	resource_size_t	barsz[PCI_SRIOV_NUM_BARS];	/* VF BAR size */
> >>> +	bool		drivers_autoprobe; /* Auto probing of VFs by driver */
> >>> +};
> >>> +
> >>
> >> Can "struct pci_sriov" be extracted for common use? This should not be exclusive
> >> for "i40e_vf migration support".
> >>
> > the definition of this structure is actually in driver/pci/pci.h.
> > maybe removing the copy here and use below include is better?
> > #include "../../../../pci/pci.h"
> > 
> 
> How about moving the definition from driver/pci/pci.h into include/linux/pci.h? So
> we can just include "linux/pci.h" and removing the copy here.
>
I prefer to leaving it in drivers/pci/pci.h for now.

Thanks
Yan