netdev - Re: [RFC v2 09/11] HID: hyperv: Make ringbuffer at least take two pages

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Message-ID: <nycvar.YFH.7.76.2009021018080.4671@cbobk.fhfr.pm>
Date:   Wed, 2 Sep 2020 10:18:35 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Boqun Feng <boqun.feng@...il.com>
cc:     linux-hyperv@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org, "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...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>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: Re: [RFC v2 09/11] HID: hyperv: Make ringbuffer at least take two
 pages

On Wed, 2 Sep 2020, Boqun Feng wrote:

> 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>

Acked-by: Jiri Kosina <jkosina@...e.cz>

-- 
Jiri Kosina
SUSE Labs