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authorStephen Hemminger <stephen@networkplumber.org>2017-02-12 09:02:23 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-02-14 21:20:35 +0300
commit6e47dd3e2938f41d75045bbcb64aa9df3a463b2a (patch)
treef38bc54aecf8a392aba00143586ff6105e2c9f8d /include/linux/hyperv.h
parent5529eaf6e79a61e0ca7ade257f31d2ababc7f6c9 (diff)
downloadlinux-6e47dd3e2938f41d75045bbcb64aa9df3a463b2a.tar.xz
vmbus: expose hv_begin/end_read
In order to implement NAPI in netvsc, the driver needs access to control host interrupt mask. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> 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.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 466374dbc98f..08eb71a22c14 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1513,6 +1513,36 @@ init_cached_read_index(struct vmbus_channel *channel)
}
/*
+ * Mask off host interrupt callback notifications
+ */
+static inline void hv_begin_read(struct hv_ring_buffer_info *rbi)
+{
+ rbi->ring_buffer->interrupt_mask = 1;
+
+ /* make sure mask update is not reordered */
+ virt_mb();
+}
+
+/*
+ * Re-enable host callback and return number of outstanding bytes
+ */
+static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi)
+{
+
+ rbi->ring_buffer->interrupt_mask = 0;
+
+ /* make sure mask update is not reordered */
+ virt_mb();
+
+ /*
+ * Now check to see if the ring buffer is still empty.
+ * If it is not, we raced and we need to process new
+ * incoming messages.
+ */
+ return hv_get_bytes_to_read(rbi);
+}
+
+/*
* An API to support in-place processing of incoming VMBUS packets.
*/
#define VMBUS_PKT_TRAILER 8