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authorLong Li <longli@microsoft.com>2018-03-27 17:48:38 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2018-04-18 19:32:51 -0400
commit63273cb40101b6f303a5493f1bdf629d4ab3746b (patch)
tree34076c5b51b7acf623d5275e3aa96e726aadf5ad /drivers/hv
parentb6240a4df0186c03e5ffff6f61570ed31a1a5172 (diff)
downloadlinux-63273cb40101b6f303a5493f1bdf629d4ab3746b.tar.bz2
scsi: vmbus: Add function to report available ring buffer to write in total ring size percentage
Netvsc has a function to calculate how much ring buffer in percentage is available to write. This function is also useful for storvsc and other vmbus devices. Define a similar function in vmbus to be used by other vmbus devices. Signed-off-by: Long Li <longli@microsoft.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/ring_buffer.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 8699bb969e7e..3c836c099a8f 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -227,6 +227,8 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
ring_info->ring_buffer->feature_bits.value = 1;
ring_info->ring_size = page_cnt << PAGE_SHIFT;
+ ring_info->ring_size_div10_reciprocal =
+ reciprocal_value(ring_info->ring_size / 10);
ring_info->ring_datasize = ring_info->ring_size -
sizeof(struct hv_ring_buffer);