Drivers: hv: vmbus: Enable explicit signaling policy for NIC channels
For synthetic NIC channels, enable explicit signaling policy as netvsc wants to
explicitly control when the host is to be signaled.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index fe586bf..e3edcae 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -66,12 +66,20 @@
* arrived.
*/
-static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi)
+static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi,
+ enum hv_signal_policy policy)
{
virt_mb();
if (READ_ONCE(rbi->ring_buffer->interrupt_mask))
return false;
+ /*
+ * When the client wants to control signaling,
+ * we only honour the host interrupt mask.
+ */
+ if (policy == HV_SIGNAL_POLICY_EXPLICIT)
+ return true;
+
/* check interrupt_mask before read_index */
virt_rmb();
/*
@@ -264,7 +272,8 @@
/* Write to the ring buffer. */
int hv_ringbuffer_write(struct hv_ring_buffer_info *outring_info,
- struct kvec *kv_list, u32 kv_count, bool *signal, bool lock)
+ struct kvec *kv_list, u32 kv_count, bool *signal, bool lock,
+ enum hv_signal_policy policy)
{
int i = 0;
u32 bytes_avail_towrite;
@@ -326,7 +335,7 @@
if (lock)
spin_unlock_irqrestore(&outring_info->ring_lock, flags);
- *signal = hv_need_to_signal(old_write, outring_info);
+ *signal = hv_need_to_signal(old_write, outring_info, policy);
return 0;
}