Drivers: hv: vmbus: Suport an API to send pagebuffers with additional control

[linux-block.git] / drivers / hv / channel.c

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 9b79aca7e565d6fe0d915d00071e9daaca3edd0b..f060d1f7bc991e8f03cecd2c2d703184d3863644 100644 (file)
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -636,13 +636,18 @@ int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer,
 EXPORT_SYMBOL(vmbus_sendpacket);
 
 /*
- * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
- * packets using a GPADL Direct packet type.
+ * vmbus_sendpacket_pagebuffer_ctl - Send a range of single-page buffer
+ * packets using a GPADL Direct packet type. This interface allows you
+ * to control notifying the host. This will be useful for sending
+ * batched data. Also the sender can control the send flags
+ * explicitly.
  */
-int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
+int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
                                     struct hv_page_buffer pagebuffers[],
                                     u32 pagecount, void *buffer, u32 bufferlen,
-                                    u64 requestid)
+                                    u64 requestid,
+                                    u32 flags,
+                                    bool kick_q)
 {
        int ret;
        int i;
@@ -670,7 +675,7 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
 
        /* Setup the descriptor */
        desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
-       desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
+       desc.flags = flags;
        desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
        desc.length8 = (u16)(packetlen_aligned >> 3);
        desc.transactionid = requestid;
@@ -691,11 +696,27 @@ int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
 
        ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal);
 
-       if (ret == 0 && signal)
+       if ((ret == 0) && kick_q && signal)
                vmbus_setevent(channel);
 
        return ret;
 }
+
+/*
+ * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
+ * packets using a GPADL Direct packet type.
+ */
+int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
+                                    struct hv_page_buffer pagebuffers[],
+                                    u32 pagecount, void *buffer, u32 bufferlen,
+                                    u64 requestid)
+{
+       u32 flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
+       return vmbus_sendpacket_pagebuffer_ctl(channel, pagebuffers, pagecount,
+                                              buffer, bufferlen, requestid,
+                                              flags, true);
+
+}
 EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
 
 /*