netdev - [PATCH net-next v2] hyper-v: allow access to vmbus from userspace driver

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Message-ID: <20150204152029.65f02d64@urahara>
Date:	Wed, 4 Feb 2015 15:20:29 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	KY Srinivasan <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	devel@...uxdriverproject.org, netdev@...r.kernel.org, dev@...k.org
Subject: [PATCH net-next v2] hyper-v: allow access to vmbus from userspace
 driver

This is enables the hyper-v driver for DPDK <dev@...k.org>.
The hv_uio driver needs to access the shared vmbus monitor
pages.

I would also like to put hv_uio in upstream kernel like other
uio drivers, but need to get API accepted with DPDK first.

Signed-off-by: Stas Egorov <segorov@...antis.com>
Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>

---
v2 - simplify and rename to vmbus_get_monitor_pages

 drivers/hv/connection.c |   20 +++++++++++++++++---
 include/linux/hyperv.h  |    3 +++
 2 files changed, 20 insertions(+), 3 deletions(-)

--- a/drivers/hv/connection.c	2015-02-03 10:58:51.751752450 -0800
+++ b/drivers/hv/connection.c	2015-02-04 14:59:51.636194383 -0800
@@ -64,6 +64,15 @@ static __u32 vmbus_get_next_version(__u3
 	}
 }
 
+void vmbus_get_monitor_pages(unsigned long *int_page,
+			     unsigned long monitor_pages[2])
+{
+	*int_page = (unsigned long)vmbus_connection.int_page;
+	monitor_pages[0] = (unsigned long)vmbus_connection.monitor_pages[0];
+	monitor_pages[1] = (unsigned long)vmbus_connection.monitor_pages[1];
+}
+EXPORT_SYMBOL_GPL(vmbus_get_monitor_pages);
+
 static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo,
 					__u32 version)
 {
@@ -347,10 +356,7 @@ static void process_chn_event(u32 relid)
 			else
 				bytes_to_read = 0;
 		} while (read_state && (bytes_to_read != 0));
-	} else {
-		pr_err("no channel callback for relid - %u\n", relid);
 	}
-
 }
 
 /*
--- a/include/linux/hyperv.h	2015-02-03 10:58:51.751752450 -0800
+++ b/include/linux/hyperv.h	2015-02-04 15:00:26.388355012 -0800
@@ -868,6 +868,9 @@ extern int vmbus_recvpacket_raw(struct v
 
 extern void vmbus_ontimer(unsigned long data);
 
+extern void vmbus_get_monitor_pages(unsigned long *int_page,
+				    unsigned long monitor_pages[2]);
+
 /* Base driver object */
 struct hv_driver {
 	const char *name;
--
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