vmbus: expose hv_begin/end_read
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>
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committed by
Greg Kroah-Hartman

parent
5529eaf6e7
commit
6e47dd3e29
@@ -1512,6 +1512,36 @@ init_cached_read_index(struct vmbus_channel *channel)
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rbi->cached_read_index = rbi->ring_buffer->read_index;
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}
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/*
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* Mask off host interrupt callback notifications
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*/
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static inline void hv_begin_read(struct hv_ring_buffer_info *rbi)
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{
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rbi->ring_buffer->interrupt_mask = 1;
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/* make sure mask update is not reordered */
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virt_mb();
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}
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/*
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* Re-enable host callback and return number of outstanding bytes
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*/
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static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi)
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{
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rbi->ring_buffer->interrupt_mask = 0;
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/* make sure mask update is not reordered */
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virt_mb();
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/*
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* Now check to see if the ring buffer is still empty.
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* If it is not, we raced and we need to process new
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* incoming messages.
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*/
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return hv_get_bytes_to_read(rbi);
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}
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/*
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* An API to support in-place processing of incoming VMBUS packets.
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*/
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