Commit 2416603e authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
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Drivers: hv: Update the ring buffer structure to match win8 functionality

Update the ringbuffer structure to support win8 functionality.
Signed-off-by: default avatarK. Y. Srinivasan <>
Reviewed-by: default avatarHaiyang Zhang <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 610071c3
......@@ -325,14 +325,28 @@ struct hv_ring_buffer {
u32 interrupt_mask;
/* Pad it to PAGE_SIZE so that data starts on page boundary */
u8 reserved[4084];
/* NOTE:
* The interrupt_mask field is used only for channels but since our
* vmbus connection also uses this data structure and its data starts
* here, we commented out this field.
* Win8 uses some of the reserved bits to implement
* interrupt driven flow management. On the send side
* we can request that the receiver interrupt the sender
* when the ring transitions from being full to being able
* to handle a message of size "pending_send_sz".
* Add necessary state for this enhancement.
u32 pending_send_sz;
u32 reserved1[12];
union {
struct {
u32 feat_pending_send_sz:1;
u32 value;
} feature_bits;
/* Pad it to PAGE_SIZE so that data starts on page boundary */
u8 reserved2[4028];
* Ring data starts here + RingDataStartOffset
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