diff options
author | K. Y. Srinivasan <kys@microsoft.com> | 2012-12-01 15:46:33 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 19:46:39 +0100 |
commit | 132368bd0b286457f83f56d0bbdecd85999562dc (patch) | |
tree | e16a4f6130d475d1f44270c088e446306b3e8355 | |
parent | Drivers: hv: Implement routines for read side signaling optimization (diff) | |
download | linux-132368bd0b286457f83f56d0bbdecd85999562dc.tar.xz linux-132368bd0b286457f83f56d0bbdecd85999562dc.zip |
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>
-rw-r--r-- | drivers/hv/channel_mgmt.c | 7 | ||||
-rw-r--r-- | include/linux/hyperv.h | 20 |
2 files changed, 27 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; diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index e73b852156b1..1ffe84de6c55 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -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); |