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authorStephen Hemminger <shemminger@linux-foundation.org>2007-10-17 13:26:41 -0700
committerJeff Garzik <jeff@garzik.org>2007-10-17 20:17:34 -0400
commitc264c3dee9f20bad1f42ef5821300791291d0f77 (patch)
treecbd106e8e69163032ab6346672a7cefe1b39da2b /include/linux/netdevice.h
parenta7475906bc496456ded9e4b062f94067fb93057a (diff)
napi_synchronize: waiting for NAPI
Some drivers with shared NAPI need a synchronization barrier. Also suggested by Benjamin Herrenschmidt for EMAC. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'include/linux/netdevice.h')
-rw-r--r--include/linux/netdevice.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 39dd83b183a..a5e2dc1f0d9 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -407,6 +407,24 @@ static inline void napi_enable(struct napi_struct *n)
clear_bit(NAPI_STATE_SCHED, &n->state);
}
+#ifdef CONFIG_SMP
+/**
+ * napi_synchronize - wait until NAPI is not running
+ * @n: napi context
+ *
+ * Wait until NAPI is done being scheduled on this context.
+ * Waits till any outstanding processing completes but
+ * does not disable future activations.
+ */
+static inline void napi_synchronize(const struct napi_struct *n)
+{
+ while (test_bit(NAPI_STATE_SCHED, &n->state))
+ msleep(1);
+}
+#else
+# define napi_synchronize(n) barrier()
+#endif
+
/*
* The DEVICE structure.
* Actually, this whole structure is a big mistake. It mixes I/O