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authorK. Y. Srinivasan <kys@microsoft.com>2012-12-01 06:46:36 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-17 10:46:39 -0800
commit98fa8cf4bcc79cb14de8fd815bbcd00dcbd7b20e (patch)
tree0d48abd179e49709cdac7e28eb853a653df7fbe2 /drivers/hv/channel.c
parentf878f3d59ed26f489add852ed6d5c8e5f3bbb1aa (diff)
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>
Diffstat (limited to 'drivers/hv/channel.c')
-rw-r--r--drivers/hv/channel.c15
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;

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