[NET]: Make NAPI polling independent of struct net_device objects.

Several devices have multiple independant RX queues per net
device, and some have a single interrupt doorbell for several
queues.

In either case, it's easier to support layouts like that if the
structure representing the poll is independant from the net
device itself.

The signature of the ->poll() call back goes from:

	int foo_poll(struct net_device *dev, int *budget)

to

	int foo_poll(struct napi_struct *napi, int budget)

The caller is returned the number of RX packets processed (or
the number of "NAPI credits" consumed if you want to get
abstract).  The callee no longer messes around bumping
dev->quota, *budget, etc. because that is all handled in the
caller upon return.

The napi_struct is to be embedded in the device driver private data
structures.

Furthermore, it is the driver's responsibility to disable all NAPI
instances in it's ->stop() device close handler.  Since the
napi_struct is privatized into the driver's private data structures,
only the driver knows how to get at all of the napi_struct instances
it may have per-device.

With lots of help and suggestions from Rusty Russell, Roland Dreier,
Michael Chan, Jeff Garzik, and Jamal Hadi Salim.

Bug fixes from Thomas Graf, Roland Dreier, Peter Zijlstra,
Joseph Fannin, Scott Wood, Hans J. Koch, and Michael Chan.

[ Ported to current tree and all drivers converted.  Integrated
  Stephen's follow-on kerneldoc additions, and restored poll_list
  handling to the old style to fix mutual exclusion issues.  -DaveM ]

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
index 92983ee7df8c..420fefb99188 100644
--- a/drivers/net/s2io.h
+++ b/drivers/net/s2io.h
@@ -786,6 +786,7 @@ struct s2io_nic {
          */
         int pkts_to_process;
         struct net_device *dev;
+        struct napi_struct napi;
         struct mac_info mac_control;
         struct config_param config;
         struct pci_dev *pdev;
@@ -1019,7 +1020,7 @@ static void s2io_set_multicast(struct net_device *dev);
 static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp);
 static void s2io_link(struct s2io_nic * sp, int link);
 static void s2io_reset(struct s2io_nic * sp);
-static int s2io_poll(struct net_device *dev, int *budget);
+static int s2io_poll(struct napi_struct *napi, int budget);
 static void s2io_init_pci(struct s2io_nic * sp);
 static int s2io_set_mac_addr(struct net_device *dev, u8 * addr);
 static void s2io_alarm_handle(unsigned long data);