[PATCHv4 RFC net-next 0/4] sunvnet: NAPIfy sunvnet

This patchset converts the sunvnet driver to use the NAPI framework.

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"
(Please cherry-pick 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 | 258 +++++++++++++++++++++++--------------
 drivers/net/ethernet/sun/sunvnet.h |   6 +-
 3 files changed, 173 insertions(+), 99 deletions(-)

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1.8.4.2