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: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 2f84c5cff8d4..7bf59177aaf8 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -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;