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authorStephen Hemminger <shemminger@linux-foundation.org>2007-10-03 19:41:36 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 19:47:45 -0400
commitbea3348eef27e6044b6161fd04c3152215f96411 (patch)
treef0990b263e5ce42505d290a4c346fe990bcd4c33 /net/sched
parentdde4e47e8fe333a5649a3fa0e7db1fa7c08d6158 (diff)
[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>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/sch_generic.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index c81649cf0b9e..e970e8e75720 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -256,6 +256,12 @@ static void dev_watchdog_down(struct net_device *dev)
256 netif_tx_unlock_bh(dev); 256 netif_tx_unlock_bh(dev);
257} 257}
258 258
259/**
260 * netif_carrier_on - set carrier
261 * @dev: network device
262 *
263 * Device has detected that carrier.
264 */
259void netif_carrier_on(struct net_device *dev) 265void netif_carrier_on(struct net_device *dev)
260{ 266{
261 if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) 267 if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state))
@@ -264,6 +270,12 @@ void netif_carrier_on(struct net_device *dev)
264 __netdev_watchdog_up(dev); 270 __netdev_watchdog_up(dev);
265} 271}
266 272
273/**
274 * netif_carrier_off - clear carrier
275 * @dev: network device
276 *
277 * Device has detected loss of carrier.
278 */
267void netif_carrier_off(struct net_device *dev) 279void netif_carrier_off(struct net_device *dev)
268{ 280{
269 if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) 281 if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state))