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authorK. Y. Srinivasan <kys@microsoft.com>2015-02-28 22:39:03 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-02 06:31:47 +0300
commit87e93d61708fe2c44875d1ecdb174aad070dbd08 (patch)
tree87cd3e9a98daa7c4b470ba11e3af230f1eb2f359
parenta13e8bbe851a96a0e78c2bd599bc34082fa697cd (diff)
downloadlinux-87e93d61708fe2c44875d1ecdb174aad070dbd08.tar.xz
Drivers: hv: vmbus: Suport an API to send pagebuffers with additional control
Implement an API for sending pagebuffers that gives more control to the client in terms of setting the vmbus flags as well as deciding when to notify the host. This will be useful for enabling batch processing. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/hv/channel.c33
-rw-r--r--include/linux/hyperv.h9
2 files changed, 36 insertions, 6 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 9b79aca7e565..f060d1f7bc99 100644
--- 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);
/*
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 1ca582457076..86e1a7a46af3 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -874,6 +874,15 @@ extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
u32 bufferlen,
u64 requestid);
+extern int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
+ struct hv_page_buffer pagebuffers[],
+ u32 pagecount,
+ void *buffer,
+ u32 bufferlen,
+ u64 requestid,
+ u32 flags,
+ bool kick_q);
+
extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
struct hv_multipage_buffer *mpb,
void *buffer,