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From: boqun.feng@gmail.com
To: Michael Kelley <mikelley@microsoft.com>
Cc: "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"linux-input@vger.kernel.org" <linux-input@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	KY Srinivasan <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	Wei Liu <wei.liu@kernel.org>, Jiri Kosina <jikos@kernel.org>,
	Benjamin Tissoires <benjamin.tissoires@redhat.com>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>
Subject: Re: [RFC 09/11] HID: hyperv: Make ringbuffer at least take two pages
Date: Thu, 23 Jul 2020 09:28:14 +0800
Message-ID: <20200723012814.GD35358@debian-boqun.qqnc3lrjykvubdpftowmye0fmh.lx.internal.cloudapp.net> (raw)
In-Reply-To: <MW2PR2101MB10524E4C2DB9FBADEF887165D7790@MW2PR2101MB1052.namprd21.prod.outlook.com>

On Wed, Jul 22, 2020 at 11:36:15PM +0000, Michael Kelley wrote:
> From: Boqun Feng <boqun.feng@gmail.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@gmail.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
> 

  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-21  1:41 [RFC 00/11] Hyper-V: Support PAGE_SIZE larger than 4K Boqun Feng
2020-07-21  1:41 ` [RFC 01/11] Drivers: hv: vmbus: Always use HV_HYP_PAGE_SIZE for gpadl Boqun Feng
2020-07-21 15:22   ` Wei Liu
2020-07-22 23:20     ` Boqun Feng
2020-07-21  1:41 ` [RFC 02/11] Drivers: hv: vmbus: Move __vmbus_open() Boqun Feng
2020-07-21 15:23   ` Wei Liu
2020-07-21  1:41 ` [RFC 03/11] Drivers: hv: vmbus: Introduce types of GPADL Boqun Feng
2020-07-22 23:25   ` Michael Kelley
2020-07-22 23:43     ` Boqun Feng
2020-07-22 23:56       ` Michael Kelley
2020-07-21  1:41 ` [RFC 04/11] Drivers: hv: Use HV_HYP_PAGE in hv_synic_enable_regs() Boqun Feng
2020-07-21  1:41 ` [RFC 05/11] Drivers: hv: vmbus: Move virt_to_hvpfn() to hyperv header Boqun Feng
2020-07-21  1:41 ` [RFC 06/11] hv: hyperv.h: Introduce some hvpfn helper functions Boqun Feng
2020-07-21  1:41 ` [RFC 07/11] hv_netvsc: Use HV_HYP_PAGE_SIZE for Hyper-V communication Boqun Feng
2020-07-21  1:41 ` [RFC 08/11] Input: hyperv-keyboard: Make ringbuffer at least take two pages Boqun Feng
2020-07-21  1:41 ` [RFC 09/11] HID: hyperv: " Boqun Feng
2020-07-22 23:36   ` Michael Kelley
2020-07-23  1:28     ` boqun.feng [this message]
2020-07-21  1:41 ` [RFC 10/11] Driver: hv: util: " Boqun Feng
2020-07-21  1:41 ` [RFC 11/11] scsi: storvsc: Support PAGE_SIZE larger than 4K Boqun Feng
2020-07-23  0:13   ` Michael Kelley
2020-07-23  1:51     ` boqun.feng
2020-07-23  2:26       ` Michael Kelley
2020-07-23  3:12         ` Boqun Feng

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