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Message-ID: <20190726090605.5026de8c@hermes.lan>
Date: Fri, 26 Jul 2019 09:06:05 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: "Himadri Pandya" <himadrispandya@...il.com>
Cc: "Michael Kelley" <Michael.H.Kelley@...rosoft.com>,
"KY Srinivasan" <kys@...sages.microsoft.com>,
"Haiyang Zhang" <haiyangz@...rosoft.com>,
"Stephen Hemminger" <sthemmin@...rosoft.com>, <sashal@...nel.org>,
<linux-hyperv@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
"himadri18.07" <himadri18.07@...il.com>
Subject: Re: [PATCH 2/2] Drivers: hv: util: Specify ring buffer size using
Hyper-V page size
On Wed, 24 Jul 2019 22:03:15 -0700
"Himadri Pandya" <himadrispandya@...il.com> wrote:
> VMbus ring buffers are sized based on the 4K page size used by
> Hyper-V. The Linux guest page size may not be 4K on all architectures
> so use the Hyper-V page size to specify the ring buffer size.
>
> Signed-off-by: Himadri Pandya <himadri18.07@...il.com>
> ---
> drivers/hv/hv_util.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
> index c2c08f26bd5f..766bd8457346 100644
> --- a/drivers/hv/hv_util.c
> +++ b/drivers/hv/hv_util.c
> @@ -413,8 +413,9 @@ static int util_probe(struct hv_device *dev,
>
> hv_set_drvdata(dev, srv);
>
> - ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL,
> 0,
> - srv->util_cb, dev->channel);
> + ret = vmbus_open(dev->channel, 4 * HV_HYP_PAGE_SIZE,
> + 4 * HV_HYP_PAGE_SIZE, NULL, 0, srv->util_cb,
> + dev->channel);
> if (ret)
> goto error;
>
hv_util doesn't need lots of buffering. Why not define a fixed
value across all architectures. Maybe with some roundup to HV_HYP_PAGE_SIZE.
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