1 files changed, 15 insertions, 1 deletions

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 2afe6fdc1dda..b4a017093b69 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -245,7 +245,10 @@ struct vmbus_channel_offer {
                 } pipe;
         } u;
         /*
-         * The sub_channel_index is defined in win8.
+         * The sub_channel_index is defined in Win8: a value of zero means a
+         * primary channel and a value of non-zero means a sub-channel.
+         *
+         * Before Win8, the field is reserved, meaning it's always zero.
          */
         u16 sub_channel_index;
         u16 reserved3;
@@ -423,6 +426,9 @@ enum vmbus_channel_message_type {
         CHANNELMSG_COUNT
 };
 
+/* Hyper-V supports about 2048 channels, and the RELIDs start with 1. */
+#define INVALID_RELID   U32_MAX
+
 struct vmbus_channel_message_header {
         enum vmbus_channel_message_type msgtype;
         u32 padding;
@@ -934,6 +940,11 @@ static inline bool is_hvsock_channel(const struct vmbus_channel *c)
                   VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER);
 }
 
+static inline bool is_sub_channel(const struct vmbus_channel *c)
+{
+        return c->offermsg.offer.sub_channel_index != 0;
+}
+
 static inline void set_channel_affinity_state(struct vmbus_channel *c,
                                               enum hv_numa_policy policy)
 {
@@ -1149,6 +1160,9 @@ struct hv_driver {
         int (*remove)(struct hv_device *);
         void (*shutdown)(struct hv_device *);
 
+        int (*suspend)(struct hv_device *);
+        int (*resume)(struct hv_device *);
+
 };
 
 /* Base device object */