netdev - Re: [RFC 09/11] HID: hyperv: Make ringbuffer at least take two pages

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Date:   Thu, 23 Jul 2020 09:28:14 +0800
From:   boqun.feng@...il.com
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [RFC 09/11] HID: hyperv: Make ringbuffer at least take two pages

On Wed, Jul 22, 2020 at 11:36:15PM +0000, Michael Kelley wrote:
> From: Boqun Feng <boqun.feng@...il.com> Sent: Monday, July 20, 2020 6:42 PM
> > 
> > When PAGE_SIZE > HV_HYP_PAGE_SIZE, we need the ringbuffer size to be at
> > least 2 * PAGE_SIZE: one page for the header and at least one page of
> > the data part (because of the alignment requirement for double mapping).
> > 
> > So make sure the ringbuffer sizes to be at least 2 * PAGE_SIZE when
> > using vmbus_open() to establish the vmbus connection.
> > 
> > Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> > ---
> >  drivers/hid/hid-hyperv.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/hid/hid-hyperv.c b/drivers/hid/hid-hyperv.c
> > index 0b6ee1dee625..36c5e157c691 100644
> > --- a/drivers/hid/hid-hyperv.c
> > +++ b/drivers/hid/hid-hyperv.c
> > @@ -104,8 +104,8 @@ struct synthhid_input_report {
> > 
> >  #pragma pack(pop)
> > 
> > -#define INPUTVSC_SEND_RING_BUFFER_SIZE		(40 * 1024)
> > -#define INPUTVSC_RECV_RING_BUFFER_SIZE		(40 * 1024)
> > +#define INPUTVSC_SEND_RING_BUFFER_SIZE		(128 * 1024)
> > +#define INPUTVSC_RECV_RING_BUFFER_SIZE		(128 * 1024)
> 
> Use max(40 * 1024, 2 * PAGE_SIZE) like in patch 8 of the series?
> 

Sure! Will change it in next version.

Regards,
Boqun

> > 
> > 
> >  enum pipe_prot_msg_type {
> > --
> > 2.27.0
>