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Commit 132368bd authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
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Drivers: hv: Add state to manage batched reading 



For the "read" side signaling optimization, the reader has to completely
drain the queue before exiting. Add state to manage this "batched"
reading.

Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6fdf3b21

drivers/hv/channel_mgmt.c

+7 −0
Original line number Diff line number Diff line
@@ -275,6 +275,13 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) 
		return;

	}



	/*

	 * By default we setup state to enable batched

	 * reading. A specific service can choose to

	 * disable this prior to opening the channel.

	 */

	newchannel->batched_reading = true;



	memcpy(&newchannel->offermsg, offer,

	       sizeof(struct vmbus_channel_offer_channel));

	newchannel->monitor_grp = (u8)offer->monitorid / 32;

include/linux/hyperv.h

+20 −0
Original line number Diff line number Diff line
@@ -882,8 +882,28 @@ struct vmbus_channel { 


	void (*onchannel_callback)(void *context);

	void *channel_callback_context;



	/*

	 * A channel can be marked for efficient (batched)

	 * reading:

	 * If batched_reading is set to "true", we read until the

	 * channel is empty and hold off interrupts from the host

	 * during the entire read process.

	 * If batched_reading is set to "false", the client is not

	 * going to perform batched reading.

	 *

	 * By default we will enable batched reading; specific

	 * drivers that don't want this behavior can turn it off.

	 */



	bool batched_reading;

};



static inline void set_channel_read_state(struct vmbus_channel *c, bool state)

{

	c->batched_reading = state;

}



void vmbus_onmessage(void *context);



int vmbus_request_offers(void);