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vmbus: expose hv_begin/end_read

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In order to implement NAPI in netvsc, the driver needs access to
control host interrupt mask.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger 2017-02-11 23:02:23 -07:00 committed by Greg Kroah-Hartman
parent 5529eaf6e7
commit 6e47dd3e29
3 changed files with 30 additions and 24 deletions
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4
drivers/hv/hyperv_vmbus.h
View file

@ -292,10 +292,6 @@ int hv_ringbuffer_read(struct vmbus_channel *channel,
void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
struct hv_ring_buffer_debug_info *debug_info);
void hv_begin_read(struct hv_ring_buffer_info *rbi);
u32 hv_end_read(struct hv_ring_buffer_info *rbi);
/*
* Maximum channels is determined by the size of the interrupt page
* which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt

20
drivers/hv/ring_buffer.c
View file

@ -32,26 +32,6 @@
#include "hyperv_vmbus.h"
void hv_begin_read(struct hv_ring_buffer_info *rbi)
{
rbi->ring_buffer->interrupt_mask = 1;
virt_mb();
}
u32 hv_end_read(struct hv_ring_buffer_info *rbi)
{
rbi->ring_buffer->interrupt_mask = 0;
virt_mb();
/*
* Now check to see if the ring buffer is still empty.
* If it is not, we raced and we need to process new
* incoming messages.
*/
return hv_get_bytes_to_read(rbi);
}
/*
* When we write to the ring buffer, check if the host needs to
* be signaled. Here is the details of this protocol:

30
include/linux/hyperv.h
View file

@ -1512,6 +1512,36 @@ init_cached_read_index(struct vmbus_channel *channel)
rbi->cached_read_index = rbi->ring_buffer->read_index;
}
/*
* Mask off host interrupt callback notifications
*/
static inline void hv_begin_read(struct hv_ring_buffer_info *rbi)
{
rbi->ring_buffer->interrupt_mask = 1;
/* make sure mask update is not reordered */
virt_mb();
}
/*
* Re-enable host callback and return number of outstanding bytes
*/
static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi)
{
rbi->ring_buffer->interrupt_mask = 0;
/* make sure mask update is not reordered */
virt_mb();
/*
* Now check to see if the ring buffer is still empty.
* If it is not, we raced and we need to process new
* incoming messages.
*/
return hv_get_bytes_to_read(rbi);
}
/*
* An API to support in-place processing of incoming VMBUS packets.
*/