netdev - Re: [PATCH net-next 2/2] ionic: support sr-iov operations

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Message-ID: <e40b9299-fd5c-5f62-0c5c-91f254c7a895@pensando.io>
Date:   Tue, 10 Dec 2019 16:39:41 -0800
From:   Shannon Nelson <snelson@...sando.io>
To:     Parav Pandit <parav@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [PATCH net-next 2/2] ionic: support sr-iov operations

On 12/10/19 3:25 PM, Parav Pandit wrote:
> On 12/10/2019 4:54 PM, Shannon Nelson wrote:
>> Add the netdev ops for managing VFs.  Since most of the
>> management work happens in the NIC firmware, the driver becomes
>> mostly a pass-through for the network stack commands that want
>> to control and configure the VFs.
>>
>> We also tweak ionic_station_set() a little to allow for
>> the VFs that start off with a zero'd mac address.
>>
>> Signed-off-by: Shannon Nelson <snelson@...sando.io>
>> ---
>>   drivers/net/ethernet/pensando/ionic/ionic.h   |  16 +-
>>   .../ethernet/pensando/ionic/ionic_bus_pci.c   |  75 +++++++
>>   .../net/ethernet/pensando/ionic/ionic_dev.c   |  61 ++++++
>>   .../net/ethernet/pensando/ionic/ionic_dev.h   |   7 +
>>   .../net/ethernet/pensando/ionic/ionic_lif.c   | 188 +++++++++++++++++-
>>   .../net/ethernet/pensando/ionic/ionic_lif.h   |   6 +
>>   .../net/ethernet/pensando/ionic/ionic_main.c  |   4 +
>>   7 files changed, 349 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/pensando/ionic/ionic.h b/drivers/net/ethernet/pensando/ionic/ionic.h
>> index 98e102af7756..d4cf58da8d13 100644
>> --- a/drivers/net/ethernet/pensando/ionic/ionic.h
>> +++ b/drivers/net/ethernet/pensando/ionic/ionic.h
>> @@ -12,7 +12,7 @@ struct ionic_lif;
>>   
>>   #define IONIC_DRV_NAME		"ionic"
>>   #define IONIC_DRV_DESCRIPTION	"Pensando Ethernet NIC Driver"
>> -#define IONIC_DRV_VERSION	"0.18.0-k"
>> +#define IONIC_DRV_VERSION	"0.20.0-k"
>>   
>>   #define PCI_VENDOR_ID_PENSANDO			0x1dd8
>>   
>> @@ -25,6 +25,18 @@ struct ionic_lif;
>>   
>>   #define DEVCMD_TIMEOUT  10
>>   
>> +struct ionic_vf {
>> +	u16	 index;
>> +	u8	 macaddr[6];
>> +	__le32	 maxrate;
>> +	__le16	 vlanid;
>> +	u8	 spoofchk;
>> +	u8	 trusted;
>> +	u8	 linkstate;
>> +	dma_addr_t       stats_pa;
>> +	struct ionic_lif_stats stats;
>> +};
>> +
>>   struct ionic {
>>   	struct pci_dev *pdev;
>>   	struct device *dev;
>> @@ -46,6 +58,8 @@ struct ionic {
>>   	DECLARE_BITMAP(intrs, IONIC_INTR_CTRL_REGS_MAX);
>>   	struct work_struct nb_work;
>>   	struct notifier_block nb;
>> +	int num_vfs;
> Please drop num_vfs and use pci_num_vf() in ionic_get_vf_config() and
> other friend functions.

Sure.

>> +	struct ionic_vf **vf;
>>   	struct timer_list watchdog_timer;
>>   	int watchdog_period;
>>   };
>> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
>> index 9a9ab8cb2cb3..fe4efe12b50b 100644
>> --- a/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
>> +++ b/drivers/net/ethernet/pensando/ionic/ionic_bus_pci.c
>> @@ -274,11 +274,86 @@ static void ionic_remove(struct pci_dev *pdev)
>>   	ionic_devlink_free(ionic);
>>   }
>>   
>> +static int ionic_sriov_configure(struct pci_dev *pdev, int num_vfs)
>> +{
>> +	struct ionic *ionic = pci_get_drvdata(pdev);
>> +	struct device *dev = ionic->dev;
>> +	unsigned int size;
>> +	int i, err = 0;
>> +
>> +	if (!ionic_is_pf(ionic))
>> +		return -ENODEV;
>> +
> This check is already done by pci core kernel. No need for ionic driver
> to do this. If SR-IOV capability is not enabled, it won't reach here.

Got it

>
>> +	if (num_vfs > 0) {
>> +		err = pci_enable_sriov(pdev, num_vfs);
>> +		if (err) {
>> +			dev_err(&pdev->dev, "Cannot enable SRIOV: %d\n", err);
>> +			return err;
>> +		}
>> +
>> +		size = sizeof(struct ionic_vf *) * num_vfs;
>> +		ionic->vf = kzalloc(size, GFP_KERNEL);
> Please use kcalloc()

Sure

Thanks for the comments,
sln