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

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Date:   Thu, 2 Jan 2020 16:01:00 +0000
From:   "Saleem, Shiraz" <shiraz.saleem@...el.com>
To:     'Jason Gunthorpe' <jgg@...pe.ca>
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

> 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?

This is not used in irdma for checking any versioning.

This and the version in struct i40e_client are not cleaned up because they are used
between i40e <--> i40iw. And the thought was once i40iw is removed, we can send
a follow on patch to remove this versioning + the global
exported functions i40e_register_client() and i40e_unregister_client() used by i40iw. 

For the ice driver, we have already removed all versioning.

> 
> >  	u8 lanmac[6];
> 
> Is this different from the mac reachable from the netdev?

Hmmm... I think not. This should be possible to get from netdev. We can send a cleanup follow on patch.


> > +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?
> 
The consumer of the ldev (i.e the rdma driver) will have a
valid ldev when drv->remove() is called as part of the virtbus
device unregister.
It is probably good to set this ldev pointer inside the i40e_virtbus_device
object to NULL in the netdev driver soon after virtbus device unregister.