linux-stable.git/drivers/hv/ring_buffer.c, branch linux-3.17.y

Drivers: hv: vmbus: Cleanup the packet send path

2014-02-07T23:22:40+00:00

The current channel code is using scatterlist abstraction to pass data to the
ringbuffer API on the send path. This causes unnecessary translations
between virtual and physical addresses. Fix this.

Signed-off-by: K. Y. Srinivasan 
Signed-off-by: Greg Kroah-Hartman

drivers: hv: check interrupt mask before read_index

2013-06-24T23:24:17+00:00

This patches add a read barriers to force the driver to check the interrupt mask
before read_index. Otherwise we may lost a kick to host.

Cc: K. Y. Srinivasan 
Cc: Haiyang Zhang 
Signed-off-by: Jason Wang 
Signed-off-by:  K. Y. Srinivasan 
Signed-off-by: Greg Kroah-Hartman

drivers: hv: switch to use mb() instead of smp_mb()

2013-06-18T18:14:18+00:00

Even if guest were compiled without SMP support, it could not assume that host
wasn't. So switch to use mb() instead of smp_mb() to force memory barriers for
UP guest.

Signed-off-by: Jason Wang 
Cc: Haiyang Zhang 
Cc: stable 
Signed-off-by: K. Y. Srinivasan 
Signed-off-by: Greg Kroah-Hartman

Drivers: hv: vmbus: Fix a bug in hv_need_to_signal()

2013-04-01T19:29:52+00:00

As part of updating the vmbus protocol, the function hv_need_to_signal()
was introduced. This functions helps optimize signalling from guest to
host. The newly added memory barrier is needed to ensure that we correctly
decide when to signal the host.

Signed-off-by: K. Y. Srinivasan 
Reviewed-by: Haiyang Zhang 
Reported-by: Olaf Hering 
Cc: Stable   (V3.8+)
Signed-off-by: Greg Kroah-Hartman

Drivers: hv: Implement flow management on the send side

2013-01-17T19:41:49+00:00

Implement flow management on the send side. When the sender is blocked, the reader
can potentially signal the sender to indicate there is now room to send.

Signed-off-by: K. Y. Srinivasan 
Reviewed-by: Haiyang Zhang 
Signed-off-by: Greg Kroah-Hartman

Drivers: hv: Get rid of hv_get_ringbuffer_interrupt_mask()

2013-01-17T18:46:39+00:00

This function is no longer used; get rid of it.

Signed-off-by: K. Y. Srinivasan 
Reviewed-by: Haiyang Zhang 
Signed-off-by: Greg Kroah-Hartman

Drivers: hv: Optimize the signaling on the write path

2013-01-17T18:46:39+00:00

The host has already implemented the "read" side optimizations.
Leverage that to optimize "write" side signaling.

Signed-off-by: K. Y. Srinivasan 
Reviewed-by: Haiyang Zhang 
Signed-off-by: Greg Kroah-Hartman

Drivers: hv: Implement routines for read side signaling optimization

2013-01-17T18:46:39+00:00

Implement functions that will support read-side signaling optimization.
By having the reader indicate the start of the "read" operation and the
"end" of the read operation we can more efficiently handle the signaling
protocol: while the read is in progress, there is no need for the "writer"
to signal the "reader" as new items are put on the read queue.

Signed-off-by: K. Y. Srinivasan 
Reviewed-by: Haiyang Zhang 
Signed-off-by: Greg Kroah-Hartman

net/hyperv: Add flow control based on hi/low watermark

2012-04-03T21:47:15+00:00

In the existing code, we only stop queue when the ringbuffer is full,
so the current packet has to be dropped or retried from upper layer.

This patch stops the tx queue when available ringbuffer is below
the low watermark. So the ringbuffer still has small amount of space
available for the current packet. This will reduce the overhead of
retries on sending.

Signed-off-by: Haiyang Zhang 
Reviewed-by: K. Y. Srinivasan 
Signed-off-by: David S. Miller

Staging: hv: remove last user of DPRINT() macro

2011-10-11T15:51:21+00:00

This also removed the unused function hv_dump_ring_info().

Cc: K. Y. Srinivasan 
Signed-off-by: Greg Kroah-Hartman