netdev - Re: [PATCH v3 04/20] i40e: Register a virtbus device to provide RDMA

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Date:   Wed, 18 Dec 2019 15:20:58 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Saleem, Shiraz" <shiraz.saleem@...el.com>
Cc:     'Greg KH' <gregkh@...uxfoundation.org>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "parav@...lanox.com" <parav@...lanox.com>,
        "Ismail, Mustafa" <mustafa.ismail@...el.com>
Subject: Re: [PATCH v3 04/20] i40e: Register a virtbus device to provide RDMA

On Wed, Dec 18, 2019 at 06:57:10PM +0000, Saleem, Shiraz wrote:
> diff --git a/include/linux/net/intel/i40e_client.h b/include/linux/net/intel/i40e_client.h
> index 7e147d3..5c81261 100644
> +++ b/include/linux/net/intel/i40e_client.h
> @@ -83,11 +83,11 @@ struct i40e_params {
>  
>  /* Structure to hold Lan device info for a client device */
>  struct i40e_info {
>  	struct i40e_client_version version;

I hope this isn't the inter-module versioning stuff we already Nak'd?

>  	u8 lanmac[6];

Is this different from the mac reachable from the netdev?

>  	struct net_device *netdev;
>  	struct pci_dev *pcidev;
> +	struct virtbus_device *vdev;

If there is only one of these per virtbus_device then why do we need
to split the structure?

>  	u8 __iomem *hw_addr;
>  	u8 fid;	/* function id, PF id or VF id */
>  #define I40E_CLIENT_FTYPE_PF 0
> @@ -112,6 +112,11 @@ struct i40e_info {
>  	u32 fw_build;                   /* firmware build number */
>  };
>  
> +struct i40e_virtbus_device {
> +	struct virtbus_device vdev;
> +	struct i40e_info *ldev;

Is the lifetime actually any better? Will ldev be freed and left
danling before virtbus_device is released?

Jason