sunvnet: NAPI enhancements.

This patchset converts the sunvnet driver to use the NAPI framework. Changes since v4 to (Patch 1):
vnet_event accumulates LDC_EVENT_* bits into rx_event. vnet_event_napi() unrolls send_events() logic to process all rx_event bits.
(Mail Subject of cover-letter changed, to keep it distinct from subject of patch 1)

Patch 1 in the series addresses the packet-receive path- all the vnet_event() processing is moved into NAPI context. This patch is dependant on the sparc-next commit:
"sparc64: Add vio_set_intr() to enable/disable Rx interrupts" (sparc commit id ca605b7dd740c8909408d67911d8ddd272c2b320)

Patch 2 uses RCU to fix race conditions between vnet_port_remove and paths that access/modify port-related state, such as vnet_start_xmit.

Patch 3 and Patch 4 in the series leverage from the NAPIfied Rx path, dropping superfluous usage of the irqsave/irqrestores on the vio.lock where possible.

Note: Patch 3 contains changes that target sparc-next, Patch 4 targets net-next.

Sowmini Varadhan (4):
NAPIfy sunvnet
Use RCU to synchronize port usage with vnet_port_remove() Avoid irqsave/restore on vio.lock if in_softirq() Remove irqsave/irqrestore on vio.lock

 arch/sparc/kernel/viohs.c          |   8 +-
 drivers/net/ethernet/sun/sunvnet.c | 265 +++++++++++++++++++++++--------------
 drivers/net/ethernet/sun/sunvnet.h |   6 +-
 3 files changed, 179 insertions(+), 100 deletions(-)

1.8.4.2