Drivers: hv: vmbus: Support a vmbus API for efficiently sending page arrays

[linux-2.6-block.git] / include / linux / hyperv.h

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 476c685ca6f9c5c6447944aee2fa98a85cdd14e4..259023a34becc775fc115a62754851776b935880 100644 (file)
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -57,6 +57,18 @@ struct hv_multipage_buffer {
        u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
 };
 
+/*
+ * Multiple-page buffer array; the pfn array is variable size:
+ * The number of entries in the PFN array is determined by
+ * "len" and "offset".
+ */
+struct hv_mpb_array {
+       /* Length and Offset determines the # of pfns in the array */
+       u32 len;
+       u32 offset;
+       u64 pfn_array[];
+};
+
 /* 0x18 includes the proprietary packet header */
 #define MAX_PAGE_BUFFER_PACKET         (0x18 +                 \
                                        (sizeof(struct hv_page_buffer) * \
@@ -814,6 +826,18 @@ struct vmbus_channel_packet_multipage_buffer {
        struct hv_multipage_buffer range;
 } __packed;
 
+/* The format must be the same as struct vmdata_gpa_direct */
+struct vmbus_packet_mpb_array {
+       u16 type;
+       u16 dataoffset8;
+       u16 length8;
+       u16 flags;
+       u64 transactionid;
+       u32 reserved;
+       u32 rangecount;         /* Always 1 in this case */
+       struct hv_mpb_array range;
+} __packed;
+
 
 extern int vmbus_open(struct vmbus_channel *channel,
                            u32 send_ringbuffersize,
@@ -845,6 +869,13 @@ extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
                                        u32 bufferlen,
                                        u64 requestid);
 
+extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
+                                    struct vmbus_packet_mpb_array *mpb,
+                                    u32 desc_size,
+                                    void *buffer,
+                                    u32 bufferlen,
+                                    u64 requestid);
+
 extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
                                      void *kbuffer,
                                      u32 size,