Drivers: hv: Implement flow management on the send side
Implement flow management on the send side. When the sender is blocked, the reader
can potentially signal the sender to indicate there is now room to send.
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>
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 9303252..064257e 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -735,6 +735,7 @@
u32 packetlen;
u32 userlen;
int ret;
+ bool signal = false;
*buffer_actual_len = 0;
*requestid = 0;
@@ -761,8 +762,10 @@
/* Copy over the packet to the user buffer */
ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen,
- (desc.offset8 << 3));
+ (desc.offset8 << 3), &signal);
+ if (signal)
+ vmbus_setevent(channel);
return 0;
}
@@ -779,6 +782,7 @@
u32 packetlen;
u32 userlen;
int ret;
+ bool signal = false;
*buffer_actual_len = 0;
*requestid = 0;
@@ -805,7 +809,11 @@
*requestid = desc.trans_id;
/* Copy over the entire packet to the user buffer */
- ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0);
+ ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0,
+ &signal);
+
+ if (signal)
+ vmbus_setevent(channel);
return 0;
}