linux-kernel - RE: [EXTERNAL] Re: [PATCH v2 1/5] uio: Add hv_vmbus

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Date:   Tue, 20 Jun 2023 07:41:18 +0000
From:   Saurabh Singh Sengar <ssengar@...rosoft.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Saurabh Sengar <ssengar@...ux.microsoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "corbet@....net" <corbet@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: RE: [EXTERNAL] Re: [PATCH v2 1/5] uio: Add hv_vmbus_client driver



> -----Original Message-----
> From: Greg KH <gregkh@...uxfoundation.org>
> Sent: Tuesday, June 20, 2023 12:37 PM
> To: Saurabh Singh Sengar <ssengar@...rosoft.com>
> Cc: Saurabh Sengar <ssengar@...ux.microsoft.com>; KY Srinivasan
> <kys@...rosoft.com>; Haiyang Zhang <haiyangz@...rosoft.com>;
> wei.liu@...nel.org; Dexuan Cui <decui@...rosoft.com>; Michael Kelley
> (LINUX) <mikelley@...rosoft.com>; corbet@....net; linux-
> kernel@...r.kernel.org; linux-hyperv@...r.kernel.org; linux-
> doc@...r.kernel.org
> Subject: Re: [EXTERNAL] Re: [PATCH v2 1/5] uio: Add hv_vmbus_client driver
> 
> On Tue, Jun 20, 2023 at 05:19:14AM +0000, Saurabh Singh Sengar wrote:
> > > And you are defining a "global" variable that can be modified by an
> > > individual sysfs file for ANY device bound to this driver, messing
> > > with the other device's ring buffer size, right?  This needs to be
> > > per-device, or explain in huge detail here why not.
> >
> > The global variable is expected to be set by userspace per device
> > before opening, the particular uio device. For a particular Hyper-v
> > device this value be same, and once device is open the ring buffer is
> > allocated and there won't be any impact afterwards changing it. I can
> elaborate more of this in sysfs documentation.
> 
> That's totally confusing, please make this per-device properly, as you will find
> out when you try to document it, what you are describing is unlike any other
> per-device interface we have.

Ok, will make this per device. Thanks.

- Saurabh

> 
> greg k-h