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vmbus: split ring buffer allocation from open

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The UIO driver needs the ring buffer to be persistent(reused)
across open/close. Split the allocation and setup of ring buffer
out of vmbus_open. For normal usage vmbus_open/vmbus_close there
are no changes; only impacts uio_hv_generic which needs to keep
ring buffer memory and reuse when application restarts.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger 2018-09-14 09:10:17 -07:00 • committed by Greg Kroah-Hartman
parent 52a42c2a90
commit ae6935ed7d
3 changed files with 169 additions and 122 deletions
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9
include/linux/hyperv.h
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@ -741,6 +741,7 @@ struct vmbus_channel {
/* Allocated memory for ring buffer */
struct page *ringbuffer_page;
u32 ringbuffer_pagecount;
u32 ringbuffer_send_offset;
struct hv_ring_buffer_info outbound; /* send to parent */
struct hv_ring_buffer_info inbound; /* receive from parent */
@ -1021,6 +1022,14 @@ struct vmbus_packet_mpb_array {
struct hv_mpb_array range;
} __packed;
int vmbus_alloc_ring(struct vmbus_channel *channel,
u32 send_size, u32 recv_size);
void vmbus_free_ring(struct vmbus_channel *channel);
int vmbus_connect_ring(struct vmbus_channel *channel,
void (*onchannel_callback)(void *context),
void *context);
int vmbus_disconnect_ring(struct vmbus_channel *channel);
extern int vmbus_open(struct vmbus_channel *channel,
u32 send_ringbuffersize,