[PATCH 09/28] Drivers: hv: Extend/modify vmbus_channel_offer_channel for win7 and beyond

K. Y. Srinivasan
2012-12-01T14:27:39Z

The "offfer" message sent by the host has been extended in win7 (ws2008 R2).
Add/modify state to reflect this extension. All these changes are backward
compatible.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
---
include/linux/hyperv.h | 36 +++++++++++++++++++++++++++++++-----
1 files changed, 31 insertions(+), 5 deletions(-)

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 2b54801..bee559a 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -440,9 +440,13 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
struct vmbus_channel_offer {
uuid_le if_type;
uuid_le if_instance;
- u64 int_latency; /* in 100ns units */
- u32 if_revision;
- u32 server_ctx_size; /* in bytes */
+
+ /*
+ * These two fields are not currently used.
+ */
+ u64 reserved1;
+ u64 reserved2;
+
u16 chn_flags;
u16 mmio_megabytes; /* in bytes * 1024 * 1024 */

@@ -464,7 +468,11 @@ struct vmbus_channel_offer {
unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
} pipe;
} u;
- u32 padding;
+ /*
+ * The sub_channel_index is defined in win8.
+ */
+ u16 sub_channel_index;
+ u16 reserved3;
} __packed;

/* Server Flags */
@@ -660,7 +668,25 @@ struct vmbus_channel_offer_channel {
struct vmbus_channel_offer offer;
u32 child_relid;
u8 monitorid;
- u8 monitor_allocated;
+ /*
+ * win7 and beyond splits this field into a bit field.
+ */
+ u8 monitor_allocated:1;
+ u8 reserved:7;
+ /*
+ * These are new fields added in win7 and later.
+ * Do not access these fields without checking the
+ * negotiated protocol.
+ *
+ * If "is_dedicated_interrupt" is set, we must not set the
+ * associated bit in the channel bitmap while sending the
+ * interrupt to the host.
+ *
+ * connection_id is to be used in signaling the host.
+ */
+ u16 is_dedicated_interrupt:1;
+ u16 reserved1:15;
+ u32 connection_id;
} __packed;

/* Rescind Offer parameters */
--
1.7.4.1