netdev - Re: [PATCH v5 vfio 3/7] vfio/pds: register with the pds

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Message-ID: <57f5d678-a3f9-d812-9900-d8435a44eb23@amd.com>
Date:   Fri, 24 Mar 2023 15:36:57 -0700
From:   Brett Creeley <bcreeley@....com>
To:     Alex Williamson <alex.williamson@...hat.com>,
        Brett Creeley <brett.creeley@....com>
Cc:     kvm@...r.kernel.org, netdev@...r.kernel.org, jgg@...dia.com,
        yishaih@...dia.com, shameerali.kolothum.thodi@...wei.com,
        kevin.tian@...el.com, shannon.nelson@....com, drviers@...sando.io
Subject: Re: [PATCH v5 vfio 3/7] vfio/pds: register with the pds_core PF

On 3/24/2023 3:02 PM, Alex Williamson wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
> 
> 
> On Wed, 22 Mar 2023 13:34:38 -0700
> Brett Creeley <brett.creeley@....com> wrote:
> 
>> The pds_core driver will supply adminq services, so find the PF
>> and register with the DSC services.
>>
>> Use the following commands to enable a VF:
>> echo 1 > /sys/bus/pci/drivers/pds_core/$PF_BDF/sriov_numvfs
>>
>> Signed-off-by: Brett Creeley <brett.creeley@....com>
>> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
>> ---
>>   drivers/vfio/pci/pds/Makefile   |  1 +
>>   drivers/vfio/pci/pds/cmds.c     | 67 +++++++++++++++++++++++++++++++++
>>   drivers/vfio/pci/pds/cmds.h     | 12 ++++++
>>   drivers/vfio/pci/pds/pci_drv.c  | 16 +++++++-
>>   drivers/vfio/pci/pds/pci_drv.h  |  9 +++++
>>   drivers/vfio/pci/pds/vfio_dev.c |  5 +++
>>   drivers/vfio/pci/pds/vfio_dev.h |  2 +
>>   include/linux/pds/pds_lm.h      | 12 ++++++
>>   8 files changed, 123 insertions(+), 1 deletion(-)
>>   create mode 100644 drivers/vfio/pci/pds/cmds.c
>>   create mode 100644 drivers/vfio/pci/pds/cmds.h
>>   create mode 100644 drivers/vfio/pci/pds/pci_drv.h
>>   create mode 100644 include/linux/pds/pds_lm.h
>>
>> diff --git a/drivers/vfio/pci/pds/Makefile b/drivers/vfio/pci/pds/Makefile
>> index e1a55ae0f079..87581111fa17 100644
>> --- a/drivers/vfio/pci/pds/Makefile
>> +++ b/drivers/vfio/pci/pds/Makefile
>> @@ -4,5 +4,6 @@
>>   obj-$(CONFIG_PDS_VFIO_PCI) += pds_vfio.o
>>
>>   pds_vfio-y := \
>> +     cmds.o          \
>>        pci_drv.o       \
>>        vfio_dev.o
>> diff --git a/drivers/vfio/pci/pds/cmds.c b/drivers/vfio/pci/pds/cmds.c
>> new file mode 100644
>> index 000000000000..26e383ec4544
>> --- /dev/null
>> +++ b/drivers/vfio/pci/pds/cmds.c
>> @@ -0,0 +1,67 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/* Copyright(c) 2023 Advanced Micro Devices, Inc. */
>> +
>> +#include <linux/io.h>
>> +#include <linux/types.h>
>> +
>> +#include <linux/pds/pds_common.h>
>> +#include <linux/pds/pds_core_if.h>
>> +#include <linux/pds/pds_adminq.h>
>> +#include <linux/pds/pds_lm.h>
>> +
>> +#include "vfio_dev.h"
>> +#include "cmds.h"
>> +
>> +int
>> +pds_vfio_register_client_cmd(struct pds_vfio_pci_device *pds_vfio)
>> +{
>> +     union pds_core_adminq_comp comp = { 0 };
>> +     union pds_core_adminq_cmd cmd = { 0 };
>> +     struct device *dev;
>> +     int err, id;
>> +     u16 ci;
>> +
>> +     id = PCI_DEVID(pds_vfio->pdev->bus->number,
>> +                    pci_iov_virtfn_devfn(pds_vfio->pdev, pds_vfio->vf_id));
>> +
>> +     dev = &pds_vfio->pdev->dev;
>> +     cmd.client_reg.opcode = PDS_AQ_CMD_CLIENT_REG;
>> +     snprintf(cmd.client_reg.devname, sizeof(cmd.client_reg.devname),
>> +              "%s.%d", PDS_LM_DEV_NAME, id);
> 
> Does this devname need to be unique, and if so should it factor in
> pci_domain_nr()?  The array seems to be wide enough to easily hold the
> VF dev_name() but I haven't followed if there are additional
> constraints.  Thanks,
> 
> Alex
> 
>> +

Hey Alex,

We used the PCI_DEVID (id) as the suffix, which should be good enough to 
provide uniqueness for each devname.

Thanks for the review,

Brett

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