netdev - Re: [PATCH iwl-next v3 13/13] vfio/ice: Implement vfio

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Date: Sat, 7 Oct 2023 15:55:28 +0800
From: "Cao, Yahui" <yahui.cao@...el.com>
To: Alex Williamson <alex.williamson@...hat.com>, <anthony.l.nguyen@...el.com>
CC: <intel-wired-lan@...ts.osuosl.org>, <kvm@...r.kernel.org>,
	<netdev@...r.kernel.org>, <lingyu.liu@...el.com>, <kevin.tian@...el.com>,
	<madhu.chittim@...el.com>, <sridhar.samudrala@...el.com>, <jgg@...dia.com>,
	<yishaih@...dia.com>, <shameerali.kolothum.thodi@...wei.com>,
	<brett.creeley@....com>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <jesse.brandeburg@...el.com>
Subject: Re: [PATCH iwl-next v3 13/13] vfio/ice: Implement vfio_pci driver for
 E800 devices


On 10/4/2023 6:04 AM, Alex Williamson wrote:
> On Mon, 18 Sep 2023 06:25:46 +0000
> Yahui Cao <yahui.cao@...el.com> wrote:
>
>> From: Lingyu Liu <lingyu.liu@...el.com>
>>
>> Add a vendor-specific vfio_pci driver for E800 devices.
>>
>> It uses vfio_pci_core to register to the VFIO subsystem and then
>> implements the E800 specific logic to support VF live migration.
>>
>> It implements the device state transition flow for live
>> migration.
>>
>> Signed-off-by: Lingyu Liu <lingyu.liu@...el.com>
>> Signed-off-by: Yahui Cao <yahui.cao@...el.com>
>> ---
>>   MAINTAINERS                         |   7 +
>>   drivers/vfio/pci/Kconfig            |   2 +
>>   drivers/vfio/pci/Makefile           |   2 +
>>   drivers/vfio/pci/ice/Kconfig        |  10 +
>>   drivers/vfio/pci/ice/Makefile       |   4 +
>>   drivers/vfio/pci/ice/ice_vfio_pci.c | 707 ++++++++++++++++++++++++++++
>>   6 files changed, 732 insertions(+)
>>   create mode 100644 drivers/vfio/pci/ice/Kconfig
>>   create mode 100644 drivers/vfio/pci/ice/Makefile
>>   create mode 100644 drivers/vfio/pci/ice/ice_vfio_pci.c
> The prerequisite ice core driver support (ie. patches 1-12) should be
> supplied as a branch to allow this variant driver to be merged through
> the vfio tree.


Tony, are you the right one who can help on deal with ice driver and 
variant driver merging dependency ?

>
>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 389fe9e38884..09ea8454219a 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -22608,6 +22608,13 @@ L:	kvm@...r.kernel.org
>>   S:	Maintained
>>   F:	drivers/vfio/pci/mlx5/
>>   
>> +VFIO ICE PCI DRIVER
>> +M:	Yahui Cao <yahui.cao@...el.com>
>> +M:	Lingyu Liu <lingyu.liu@...el.com>
>> +L:	kvm@...r.kernel.org
>> +S:	Maintained
>> +F:	drivers/vfio/pci/ice/
>> +
>>   VFIO PCI DEVICE SPECIFIC DRIVERS
>>   R:	Jason Gunthorpe <jgg@...dia.com>
>>   R:	Yishai Hadas <yishaih@...dia.com>
>> diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
>> index 8125e5f37832..6618208947af 100644
>> --- a/drivers/vfio/pci/Kconfig
>> +++ b/drivers/vfio/pci/Kconfig
>> @@ -65,4 +65,6 @@ source "drivers/vfio/pci/hisilicon/Kconfig"
>>   
>>   source "drivers/vfio/pci/pds/Kconfig"
>>   
>> +source "drivers/vfio/pci/ice/Kconfig"
>> +
>>   endmenu
>> diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
>> index 45167be462d8..fc1df82df3ac 100644
>> --- a/drivers/vfio/pci/Makefile
>> +++ b/drivers/vfio/pci/Makefile
>> @@ -13,3 +13,5 @@ obj-$(CONFIG_MLX5_VFIO_PCI)           += mlx5/
>>   obj-$(CONFIG_HISI_ACC_VFIO_PCI) += hisilicon/
>>   
>>   obj-$(CONFIG_PDS_VFIO_PCI) += pds/
>> +
>> +obj-$(CONFIG_ICE_VFIO_PCI) += ice/
>> diff --git a/drivers/vfio/pci/ice/Kconfig b/drivers/vfio/pci/ice/Kconfig
>> new file mode 100644
>> index 000000000000..4c6f348d3062
>> --- /dev/null
>> +++ b/drivers/vfio/pci/ice/Kconfig
>> @@ -0,0 +1,10 @@
>> +# SPDX-License-Identifier: GPL-2.0-only
>> +config ICE_VFIO_PCI
>> +	tristate "VFIO support for Intel(R) Ethernet Connection E800 Series"
>> +	depends on ICE
>> +	depends on VFIO_PCI_CORE
> s/depends on/select/


Sure. Will change to select VFIO_PCI_CORE

>
>> +	help
>> +	  This provides migration support for Intel(R) Ethernet connection E800
>> +	  series devices using the VFIO framework.
>> +
>> +	  If you don't know what to do here, say N.
>> diff --git a/drivers/vfio/pci/ice/Makefile b/drivers/vfio/pci/ice/Makefile
>> new file mode 100644
>> index 000000000000..259d4ab89105
>> --- /dev/null
>> +++ b/drivers/vfio/pci/ice/Makefile
>> @@ -0,0 +1,4 @@
>> +# SPDX-License-Identifier: GPL-2.0-only
>> +obj-$(CONFIG_ICE_VFIO_PCI) += ice-vfio-pci.o
>> +ice-vfio-pci-y := ice_vfio_pci.o
>> +
>> diff --git a/drivers/vfio/pci/ice/ice_vfio_pci.c b/drivers/vfio/pci/ice/ice_vfio_pci.c
>> new file mode 100644
>> index 000000000000..60a0582d7932
>> --- /dev/null
>> +++ b/drivers/vfio/pci/ice/ice_vfio_pci.c
> Suggest renaming this to main.c


If changing this to drivers/vfio/pci/ice/main.c, it may cause some 
naming conflict with networking driver file 
drivers/net/ethernet/intel/ice/ice_main.c and confusion.

Could we still use ice_vfio_pci.c ? Since this variant driver only has 
single c source file( like hisilicon variant driver )


Thanks.
Yahui.