linux-kernel - [PATCH 1/1] Drivers: hv: vmbus: Support per-channel driver state

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Message-Id: <1391460165-30094-1-git-send-email-kys@microsoft.com>
Date:	Mon,  3 Feb 2014 12:42:45 -0800
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/1] Drivers: hv: vmbus: Support per-channel driver state

As we implement Virtual Receive Side Scaling on the networking side
(the VRSS patches are currently under review), it will be useful to have
per-channel state that vmbus drivers can manage. Add support for
managing per-channel state.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 include/linux/hyperv.h |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 15da677..96fb70e 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1043,6 +1043,10 @@ struct vmbus_channel {
 	 * This will be NULL for the primary channel.
 	 */
 	struct vmbus_channel *primary_channel;
+	/*
+	 * Support per-channel state for use by vmbus drivers.
+	 */
+	void *per_channel_state;
 };
 
 static inline void set_channel_read_state(struct vmbus_channel *c, bool state)
@@ -1050,6 +1054,16 @@ static inline void set_channel_read_state(struct vmbus_channel *c, bool state)
 	c->batched_reading = state;
 }
 
+static inline void set_per_channel_state(struct vmbus_channel *c, void *s)
+{
+	c->per_channel_state = s;
+}
+
+static inline void *get_per_channel_state(struct vmbus_channel *c)
+{
+	return c->per_channel_state;
+}
+
 void vmbus_onmessage(void *context);
 
 int vmbus_request_offers(void);
-- 
1.7.4.1

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