Drivers: hv: Optimize the signaling on the write path

The host has already implemented the "read" side optimizations.
Leverage that to optimize "write" side signaling.

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, 9 insertions, 6 deletions

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 773a2f25a8f0..727c5f1d6acf 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -564,6 +564,7 @@ int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer,
         struct scatterlist bufferlist[3];
         u64 aligned_data = 0;
         int ret;
+        bool signal = false;
 
 
         /* Setup the descriptor */
@@ -580,9 +581,9 @@ int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer,
         sg_set_buf(&bufferlist[2], &aligned_data,
                    packetlen_aligned - packetlen);
 
-        ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3);
+        ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
 
-        if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound))
+        if (ret == 0 && signal)
                 vmbus_setevent(channel);
 
         return ret;
@@ -606,6 +607,7 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
         u32 packetlen_aligned;
         struct scatterlist bufferlist[3];
         u64 aligned_data = 0;
+        bool signal = false;
 
         if (pagecount > MAX_PAGE_BUFFER_COUNT)
                 return -EINVAL;
@@ -641,9 +643,9 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
         sg_set_buf(&bufferlist[2], &aligned_data,
                 packetlen_aligned - packetlen);
 
-        ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3);
+        ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
 
-        if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound))
+        if (ret == 0 && signal)
                 vmbus_setevent(channel);
 
         return ret;
@@ -665,6 +667,7 @@ int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
         u32 packetlen_aligned;
         struct scatterlist bufferlist[3];
         u64 aligned_data = 0;
+        bool signal = false;
         u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset,
                                          multi_pagebuffer->len);
 
@@ -703,9 +706,9 @@ int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
         sg_set_buf(&bufferlist[2], &aligned_data,
                 packetlen_aligned - packetlen);
 
-        ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3);
+        ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
 
-        if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound))
+        if (ret == 0 && signal)
                 vmbus_setevent(channel);
 
         return ret;