[PATCH 00/28] Drivers: hv: Update the Vmbus protocol

From: K. Y. Srinivasan
Date: Sat Dec 01 2012 - 09:22:33 EST

The current vmbus protocol supported in the vmbus driver for Linux is
a version of the protocol that shipped with Windows Server 2008. Since
then a lot of enhancements have been made in the protocol to
specifically address performance and scalability of the communication
infrastructure between the host and the guest.
This patch-set brings our driver to the Win8 (Windows Server 2012) level.
Furthermore, this code will dynamically negotiate the most efficient
protocol that the host can support - the same code can be deployed on all
supported hosts (WS2008, WS2008R2 and WS2012).
Following are some of the key features implemented in this patch-set:

1. More efficient signaling protocol between the host and the guest
2. Distribution of interrupt load across available CPUs in the guest;
currently all vmbus interrupts are delivered to the boot CPU (CPU 0)
in the guest.
3. Per- channel interrupt binding (as part of item 2)
4. More efficient demultiplexing of incoming interrupts
5. Per-channel signaling mechanism for host to guest communication

K. Y. Srinivasan (28):
Drivers: hv: Implement routines for read side signaling optimization
Drivers: hv: Add state to manage batched reading
Drivers: hv: Turn off batched reading for util drivers
Drivers: hv: Optimize signaling in the read path
Drivers: hv: Optimize the signaling on the write path
Drivers: hv: Get rid of hv_get_ringbuffer_interrupt_mask()
Drivers: hv: Support handling multiple VMBUS versions
Drivers: hv: Update the ring buffer structure to match win8
Drivers: hv: Extend/modify vmbus_channel_offer_channel for win7 and
Drivers: hv: Save and export negotiated vmbus version
Drivers: hv: Change the signature for hv_signal_event()
Drivers: hv: Change the signature of vmbus_set_event()
Drivers: hv: Move vmbus version definitions to hyperv.h
Drivers: hv: Manage signaling state on a per-connection basis
Drivers: hv: Cleanup vmbus_set_event() to support win7 and beyond
Drivers: hv: Setup a mapping for Hyper-V's notion cpu ID
Drivers: hv: Add state to manage incoming channel interrupt load
Drivers: hv: Modify the interrupt handling code to support win8 and
Drivers: hv: Add code to distribute channel interrupt load
Drivers: hv: Get rid of the unused global signaling state
Drivers: hv: Get rid of unnecessary request for offers
Drivers: hv: Manage event tasklets on per-cpu basis
Drivers: hv: Handle vmbus interrupts concurrently on all cpus
Drivers: hv: Add a check to deal with spurious interrupts
Drivers: hv: Enable protocol negotiation with win8 hosts
Drivers: hv: Implement flow management on the send side
Drivers: hv: Capture the host build information
Drivers: hv: Cleanup and consolidate reporting of build/version info

drivers/hv/channel.c | 31 ++++--
drivers/hv/channel_mgmt.c | 112 ++++++++++++++++++++++
drivers/hv/connection.c | 232 ++++++++++++++++++++++++++++++++-------------
drivers/hv/hv.c | 72 +++++++-------
drivers/hv/hv_util.c | 10 ++
drivers/hv/hyperv_vmbus.h | 65 ++++++-------
drivers/hv/ring_buffer.c | 130 ++++++++++++++++++++++----
drivers/hv/vmbus_drv.c | 54 +++++++++--
include/linux/hyperv.h | 154 ++++++++++++++++++++++++++----
9 files changed, 671 insertions(+), 189 deletions(-)


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