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authorK. Y. Srinivasan <kys@microsoft.com>2016-04-02 17:59:46 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-30 14:00:19 -0700
commita6341f000024cdf1ec14dc26743a409a17378db5 (patch)
treeb2929b9009b5e9dedd2e943c8ef4b7bd8113296e /include/linux/hyperv.h
parenta389fcfd2cb57793931a9fb98fed076aae50bb6c (diff)
Drivers: hv: vmbus: Introduce functions for estimating room in the ring buffer
Introduce separate functions for estimating how much can be read from and written to the ring buffer. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/hyperv.h')
-rw-r--r--include/linux/hyperv.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index aa0fadce9308..66226ceade37 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -151,6 +151,33 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
*read = dsize - *write;
}
+static inline u32 hv_get_bytes_to_read(struct hv_ring_buffer_info *rbi)
+{
+ u32 read_loc, write_loc, dsize, read;
+
+ dsize = rbi->ring_datasize;
+ read_loc = rbi->ring_buffer->read_index;
+ write_loc = READ_ONCE(rbi->ring_buffer->write_index);
+
+ read = write_loc >= read_loc ? (write_loc - read_loc) :
+ (dsize - read_loc) + write_loc;
+
+ return read;
+}
+
+static inline u32 hv_get_bytes_to_write(struct hv_ring_buffer_info *rbi)
+{
+ u32 read_loc, write_loc, dsize, write;
+
+ dsize = rbi->ring_datasize;
+ read_loc = READ_ONCE(rbi->ring_buffer->read_index);
+ write_loc = rbi->ring_buffer->write_index;
+
+ write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
+ read_loc - write_loc;
+ return write;
+}
+
/*
* VMBUS version is 32 bit entity broken up into
* two 16 bit quantities: major_number. minor_number.